Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution
Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogene...
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| Autor*in: |
Khan, Asad [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2023 |
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| Anmerkung: |
© China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of earth science - Wuhan : China Univ. of Geosciences, 2009, 34(2023), 1 vom: Feb., Seite 70-85 |
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| Übergeordnetes Werk: |
volume:34 ; year:2023 ; number:1 ; month:02 ; pages:70-85 |
| Links: |
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| DOI / URN: |
10.1007/s12583-021-1482-3 |
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| Katalog-ID: |
SPR051466767 |
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| 100 | 1 | |a Khan, Asad |e verfasserin |0 (orcid)0000-0002-8651-308X |4 aut | |
| 245 | 1 | 0 | |a Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution |
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| 520 | |a Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area. | ||
| 700 | 1 | |a Faisal, Shah |4 aut | |
| 700 | 1 | |a Larson, Kyle P. |4 aut | |
| 700 | 1 | |a Robinson, Delores M. |4 aut | |
| 700 | 1 | |a Li, Huan |4 aut | |
| 700 | 1 | |a Ullah, Zaheen |4 aut | |
| 700 | 1 | |a Button, Mark |4 aut | |
| 700 | 1 | |a Nawab, Javed |4 aut | |
| 700 | 1 | |a Farhan, Muhammad |4 aut | |
| 700 | 1 | |a Ali, Liaqat |4 aut | |
| 700 | 1 | |a Ali, Muhammad |4 aut | |
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10.1007/s12583-021-1482-3 doi (DE-627)SPR051466767 (SPR)s12583-021-1482-3-e DE-627 ger DE-627 rakwb eng Khan, Asad verfasserin (orcid)0000-0002-8651-308X aut Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023 Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area. Faisal, Shah aut Larson, Kyle P. aut Robinson, Delores M. aut Li, Huan aut Ullah, Zaheen aut Button, Mark aut Nawab, Javed aut Farhan, Muhammad aut Ali, Liaqat aut Ali, Muhammad aut Enthalten in Journal of earth science Wuhan : China Univ. of Geosciences, 2009 34(2023), 1 vom: Feb., Seite 70-85 (DE-627)603484476 (DE-600)2501172-8 1867-111X nnns volume:34 year:2023 number:1 month:02 pages:70-85 https://dx.doi.org/10.1007/s12583-021-1482-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_121 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_636 GBV_ILN_647 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2036 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_2700 GBV_ILN_2817 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4346 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4393 GBV_ILN_4700 GBV_ILN_4753 AR 34 2023 1 02 70-85 |
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10.1007/s12583-021-1482-3 doi (DE-627)SPR051466767 (SPR)s12583-021-1482-3-e DE-627 ger DE-627 rakwb eng Khan, Asad verfasserin (orcid)0000-0002-8651-308X aut Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023 Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area. Faisal, Shah aut Larson, Kyle P. aut Robinson, Delores M. aut Li, Huan aut Ullah, Zaheen aut Button, Mark aut Nawab, Javed aut Farhan, Muhammad aut Ali, Liaqat aut Ali, Muhammad aut Enthalten in Journal of earth science Wuhan : China Univ. of Geosciences, 2009 34(2023), 1 vom: Feb., Seite 70-85 (DE-627)603484476 (DE-600)2501172-8 1867-111X nnns volume:34 year:2023 number:1 month:02 pages:70-85 https://dx.doi.org/10.1007/s12583-021-1482-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_121 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_636 GBV_ILN_647 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2036 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_2700 GBV_ILN_2817 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4346 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4393 GBV_ILN_4700 GBV_ILN_4753 AR 34 2023 1 02 70-85 |
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10.1007/s12583-021-1482-3 doi (DE-627)SPR051466767 (SPR)s12583-021-1482-3-e DE-627 ger DE-627 rakwb eng Khan, Asad verfasserin (orcid)0000-0002-8651-308X aut Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023 Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area. Faisal, Shah aut Larson, Kyle P. aut Robinson, Delores M. aut Li, Huan aut Ullah, Zaheen aut Button, Mark aut Nawab, Javed aut Farhan, Muhammad aut Ali, Liaqat aut Ali, Muhammad aut Enthalten in Journal of earth science Wuhan : China Univ. of Geosciences, 2009 34(2023), 1 vom: Feb., Seite 70-85 (DE-627)603484476 (DE-600)2501172-8 1867-111X nnns volume:34 year:2023 number:1 month:02 pages:70-85 https://dx.doi.org/10.1007/s12583-021-1482-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_121 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_636 GBV_ILN_647 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2036 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_2700 GBV_ILN_2817 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4346 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4393 GBV_ILN_4700 GBV_ILN_4753 AR 34 2023 1 02 70-85 |
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10.1007/s12583-021-1482-3 doi (DE-627)SPR051466767 (SPR)s12583-021-1482-3-e DE-627 ger DE-627 rakwb eng Khan, Asad verfasserin (orcid)0000-0002-8651-308X aut Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023 Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area. Faisal, Shah aut Larson, Kyle P. aut Robinson, Delores M. aut Li, Huan aut Ullah, Zaheen aut Button, Mark aut Nawab, Javed aut Farhan, Muhammad aut Ali, Liaqat aut Ali, Muhammad aut Enthalten in Journal of earth science Wuhan : China Univ. of Geosciences, 2009 34(2023), 1 vom: Feb., Seite 70-85 (DE-627)603484476 (DE-600)2501172-8 1867-111X nnns volume:34 year:2023 number:1 month:02 pages:70-85 https://dx.doi.org/10.1007/s12583-021-1482-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_121 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_636 GBV_ILN_647 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2036 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_2700 GBV_ILN_2817 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4346 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4393 GBV_ILN_4700 GBV_ILN_4753 AR 34 2023 1 02 70-85 |
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10.1007/s12583-021-1482-3 doi (DE-627)SPR051466767 (SPR)s12583-021-1482-3-e DE-627 ger DE-627 rakwb eng Khan, Asad verfasserin (orcid)0000-0002-8651-308X aut Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023 Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area. Faisal, Shah aut Larson, Kyle P. aut Robinson, Delores M. aut Li, Huan aut Ullah, Zaheen aut Button, Mark aut Nawab, Javed aut Farhan, Muhammad aut Ali, Liaqat aut Ali, Muhammad aut Enthalten in Journal of earth science Wuhan : China Univ. of Geosciences, 2009 34(2023), 1 vom: Feb., Seite 70-85 (DE-627)603484476 (DE-600)2501172-8 1867-111X nnns volume:34 year:2023 number:1 month:02 pages:70-85 https://dx.doi.org/10.1007/s12583-021-1482-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_121 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_374 GBV_ILN_602 GBV_ILN_636 GBV_ILN_647 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2036 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_2700 GBV_ILN_2817 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4346 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4393 GBV_ILN_4700 GBV_ILN_4753 AR 34 2023 1 02 70-85 |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">SPR051466767</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20230510063515.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">230508s2023 xx |||||o 00| ||eng c</controlfield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.1007/s12583-021-1482-3</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)SPR051466767</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(SPR)s12583-021-1482-3-e</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">Khan, Asad</subfield><subfield code="e">verfasserin</subfield><subfield code="0">(orcid)0000-0002-8651-308X</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2023</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">© China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area.</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Faisal, Shah</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Larson, Kyle P.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Robinson, Delores M.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Li, Huan</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Ullah, Zaheen</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Button, Mark</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield 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Khan, Asad |
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Khan, Asad Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution |
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Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution |
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Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution |
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Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution |
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geochemistry and in-situ u-th/pb geochronology of the jambil meta-carbonatites, northern pakistan: implications on petrogenesis and tectonic evolution |
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Geochemistry and in-situ U-Th/Pb Geochronology of the Jambil Meta-Carbonatites, Northern Pakistan: Implications on Petrogenesis and Tectonic Evolution |
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Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area. © China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023 |
| abstractGer |
Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area. © China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023 |
| abstract_unstemmed |
Abstract The putative Jambil meta-carbonatites of Swat, northern Pakistan, occur as discrete intrusions into the Proterozoic Manglaur Formation, which are difficult to be distinguished from nearby calc-silicate marble because both rock types experienced regional metamorphism during Himalayan orogenesis that resulted in similar mosaic textures and mineral assemblages. Carbonatites are often significant repositories of economic mineral resources and, therefore, are important to be distinguished from calc-silicate marble. We present new geochemical and geochronology data to distinguish between the two rock types and interpret the petrogenesis and tectonic evolution of the Jambil meta-carbonatites. Whole rock chemical data from the Jambil meta-carbonatites show characteristically high rare earth element (REE), Sr contents and lack of negative Eu anomaly, consistent with average calcio-carbonatite values worldwide and an igneous origin. More than 0.5 wt.% SrO in the meta-carbonatites and SrO > 0.15 wt.% in constituent rock forming calcite are discriminating signatures of the Jambil meta-carbonatites. Chemically, the Jambil meta-carbonatites are relatively depleted in Rb, Nb, Ta, Ti, Zr and Hf, relatively enriched in Ba, Th, Sr, and have a high LREE/HREE ratio when normalized to primitive mantle. Their carbon and oxygen isotope compositions vary from −3.5‰ to −4.3‰ and from 9.7‰ to 12.3‰, respectively. These geochemical characteristics indicate generation of the carbonatites through small degree of partial melting from a carbonated eclogitic source. In-situ, U/Pb analysis of titanite indicates that the Jambil meta-carbonatites were emplacement at 438 ± 3 Ma. When combined with regional geological observations, we interpret the emplacement of the Jambil meta-carbonatites to have taken place during the Silurian back arc extension within greater Gondwana and mark a transition from a compressional tectonic regime, brought about by collision of microcontinental blocks along the northern margin of Gondwana, to post-orogenic extension in the waning stages of the pre-Himalayan Ordovician orogeny. Finally, in-situ208Pb/232Th monazite dates (40.3−27.6 Ma) extracted from the meta-carbonatites are consistent with the Cenozoic metamorphism of the area. © China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2023 |
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| score |
7.401038 |