The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir
We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the conta...
Ausführliche Beschreibung
Autor*in: |
Zanchetta, Stefano [verfasserIn] Worthington, James [verfasserIn] Angiolini, Lucia [verfasserIn] Leven, Ernst Ja. [verfasserIn] Villa, Igor M. [verfasserIn] Zanchi, Andrea [verfasserIn] |
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E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2018 |
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Schlagwörter: |
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Übergeordnetes Werk: |
Enthalten in: Gondwana research - Amsterdam [u.a.] : Elsevier, 1997, 57, Seite 170-190 |
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Übergeordnetes Werk: |
volume:57 ; pages:170-190 |
DOI / URN: |
10.1016/j.gr.2018.01.009 |
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Katalog-ID: |
ELV000660159 |
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520 | |a We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the contact between the SE and SW Pamir and consists of a low-grade metamorphic association dominated by gabbros and serpentinized harzburgites with minor bodies of quartzdiorite and plagiogranite tectonically coupled to basaltic and rhyolitic volcanic products. Tectonic slices of metasedimentary rocks are interleaved within the complex. The BSC is in contact with a sedimentary unit rich in olistostostromes with exotic blocks containing a Lower Permian fauna showing affinity with Central Pamir. The BSC is intruded by a Lower Cretaceous granitic body with a U-Pb zircon age of 117Ma, crosscutting the whole complex. Petrographic, mineralogical and geochemical data suggest a supra-subduction-zone affinity for the gabbros and diorites. Significant enrichment in LILE and LREE compared to HREE, coupled with negative anomalies of Nb, Ti, Zr and other HFSE support this interpretation. U-Th-Pb dating of zircon from a diorite provides a lower Norian (ca. 222Ma) youngest-crystallization-age constraint, suggesting that the BSC formed in a supra-subduction setting on the South Pamir terrane prior to the collision between Central and South Pamir blocks. It was later underthrust and then obducted onto the southern margin of the closing Rushan-Pshart Ocean, which separated these two Gondwanan terranes during the Permian–Triassic. The obduction of the Bashgumbaz ophiolites can be considered as a time constraint for the collision between the South and Central Pamir terranes, which occurred within the framework of the Cimmerian orogeny that shaped the southern margin of Eurasia. | ||
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700 | 1 | |a Worthington, James |e verfasserin |4 aut | |
700 | 1 | |a Angiolini, Lucia |e verfasserin |4 aut | |
700 | 1 | |a Leven, Ernst Ja. |e verfasserin |4 aut | |
700 | 1 | |a Villa, Igor M. |e verfasserin |4 aut | |
700 | 1 | |a Zanchi, Andrea |e verfasserin |4 aut | |
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10.1016/j.gr.2018.01.009 doi (DE-627)ELV000660159 (ELSEVIER)S1342-937X(18)30036-4 DE-627 ger DE-627 rda eng 550 DE-600 Zanchetta, Stefano verfasserin aut The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the contact between the SE and SW Pamir and consists of a low-grade metamorphic association dominated by gabbros and serpentinized harzburgites with minor bodies of quartzdiorite and plagiogranite tectonically coupled to basaltic and rhyolitic volcanic products. Tectonic slices of metasedimentary rocks are interleaved within the complex. The BSC is in contact with a sedimentary unit rich in olistostostromes with exotic blocks containing a Lower Permian fauna showing affinity with Central Pamir. The BSC is intruded by a Lower Cretaceous granitic body with a U-Pb zircon age of 117Ma, crosscutting the whole complex. Petrographic, mineralogical and geochemical data suggest a supra-subduction-zone affinity for the gabbros and diorites. Significant enrichment in LILE and LREE compared to HREE, coupled with negative anomalies of Nb, Ti, Zr and other HFSE support this interpretation. U-Th-Pb dating of zircon from a diorite provides a lower Norian (ca. 222Ma) youngest-crystallization-age constraint, suggesting that the BSC formed in a supra-subduction setting on the South Pamir terrane prior to the collision between Central and South Pamir blocks. It was later underthrust and then obducted onto the southern margin of the closing Rushan-Pshart Ocean, which separated these two Gondwanan terranes during the Permian–Triassic. The obduction of the Bashgumbaz ophiolites can be considered as a time constraint for the collision between the South and Central Pamir terranes, which occurred within the framework of the Cimmerian orogeny that shaped the southern margin of Eurasia. Pamir Cimmerian orogeny Magmatic arc Tectonic accretion Worthington, James verfasserin aut Angiolini, Lucia verfasserin aut Leven, Ernst Ja. verfasserin aut Villa, Igor M. verfasserin aut Zanchi, Andrea verfasserin aut Enthalten in Gondwana research Amsterdam [u.a.] : Elsevier, 1997 57, Seite 170-190 Online-Ressource (DE-627)504859692 (DE-600)2213685-X (DE-576)259273449 1342-937X nnns volume:57 pages:170-190 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 57 170-190 |
spelling |
10.1016/j.gr.2018.01.009 doi (DE-627)ELV000660159 (ELSEVIER)S1342-937X(18)30036-4 DE-627 ger DE-627 rda eng 550 DE-600 Zanchetta, Stefano verfasserin aut The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the contact between the SE and SW Pamir and consists of a low-grade metamorphic association dominated by gabbros and serpentinized harzburgites with minor bodies of quartzdiorite and plagiogranite tectonically coupled to basaltic and rhyolitic volcanic products. Tectonic slices of metasedimentary rocks are interleaved within the complex. The BSC is in contact with a sedimentary unit rich in olistostostromes with exotic blocks containing a Lower Permian fauna showing affinity with Central Pamir. The BSC is intruded by a Lower Cretaceous granitic body with a U-Pb zircon age of 117Ma, crosscutting the whole complex. Petrographic, mineralogical and geochemical data suggest a supra-subduction-zone affinity for the gabbros and diorites. Significant enrichment in LILE and LREE compared to HREE, coupled with negative anomalies of Nb, Ti, Zr and other HFSE support this interpretation. U-Th-Pb dating of zircon from a diorite provides a lower Norian (ca. 222Ma) youngest-crystallization-age constraint, suggesting that the BSC formed in a supra-subduction setting on the South Pamir terrane prior to the collision between Central and South Pamir blocks. It was later underthrust and then obducted onto the southern margin of the closing Rushan-Pshart Ocean, which separated these two Gondwanan terranes during the Permian–Triassic. The obduction of the Bashgumbaz ophiolites can be considered as a time constraint for the collision between the South and Central Pamir terranes, which occurred within the framework of the Cimmerian orogeny that shaped the southern margin of Eurasia. Pamir Cimmerian orogeny Magmatic arc Tectonic accretion Worthington, James verfasserin aut Angiolini, Lucia verfasserin aut Leven, Ernst Ja. verfasserin aut Villa, Igor M. verfasserin aut Zanchi, Andrea verfasserin aut Enthalten in Gondwana research Amsterdam [u.a.] : Elsevier, 1997 57, Seite 170-190 Online-Ressource (DE-627)504859692 (DE-600)2213685-X (DE-576)259273449 1342-937X nnns volume:57 pages:170-190 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 57 170-190 |
allfields_unstemmed |
10.1016/j.gr.2018.01.009 doi (DE-627)ELV000660159 (ELSEVIER)S1342-937X(18)30036-4 DE-627 ger DE-627 rda eng 550 DE-600 Zanchetta, Stefano verfasserin aut The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the contact between the SE and SW Pamir and consists of a low-grade metamorphic association dominated by gabbros and serpentinized harzburgites with minor bodies of quartzdiorite and plagiogranite tectonically coupled to basaltic and rhyolitic volcanic products. Tectonic slices of metasedimentary rocks are interleaved within the complex. The BSC is in contact with a sedimentary unit rich in olistostostromes with exotic blocks containing a Lower Permian fauna showing affinity with Central Pamir. The BSC is intruded by a Lower Cretaceous granitic body with a U-Pb zircon age of 117Ma, crosscutting the whole complex. Petrographic, mineralogical and geochemical data suggest a supra-subduction-zone affinity for the gabbros and diorites. Significant enrichment in LILE and LREE compared to HREE, coupled with negative anomalies of Nb, Ti, Zr and other HFSE support this interpretation. U-Th-Pb dating of zircon from a diorite provides a lower Norian (ca. 222Ma) youngest-crystallization-age constraint, suggesting that the BSC formed in a supra-subduction setting on the South Pamir terrane prior to the collision between Central and South Pamir blocks. It was later underthrust and then obducted onto the southern margin of the closing Rushan-Pshart Ocean, which separated these two Gondwanan terranes during the Permian–Triassic. The obduction of the Bashgumbaz ophiolites can be considered as a time constraint for the collision between the South and Central Pamir terranes, which occurred within the framework of the Cimmerian orogeny that shaped the southern margin of Eurasia. Pamir Cimmerian orogeny Magmatic arc Tectonic accretion Worthington, James verfasserin aut Angiolini, Lucia verfasserin aut Leven, Ernst Ja. verfasserin aut Villa, Igor M. verfasserin aut Zanchi, Andrea verfasserin aut Enthalten in Gondwana research Amsterdam [u.a.] : Elsevier, 1997 57, Seite 170-190 Online-Ressource (DE-627)504859692 (DE-600)2213685-X (DE-576)259273449 1342-937X nnns volume:57 pages:170-190 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 57 170-190 |
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10.1016/j.gr.2018.01.009 doi (DE-627)ELV000660159 (ELSEVIER)S1342-937X(18)30036-4 DE-627 ger DE-627 rda eng 550 DE-600 Zanchetta, Stefano verfasserin aut The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the contact between the SE and SW Pamir and consists of a low-grade metamorphic association dominated by gabbros and serpentinized harzburgites with minor bodies of quartzdiorite and plagiogranite tectonically coupled to basaltic and rhyolitic volcanic products. Tectonic slices of metasedimentary rocks are interleaved within the complex. The BSC is in contact with a sedimentary unit rich in olistostostromes with exotic blocks containing a Lower Permian fauna showing affinity with Central Pamir. The BSC is intruded by a Lower Cretaceous granitic body with a U-Pb zircon age of 117Ma, crosscutting the whole complex. Petrographic, mineralogical and geochemical data suggest a supra-subduction-zone affinity for the gabbros and diorites. Significant enrichment in LILE and LREE compared to HREE, coupled with negative anomalies of Nb, Ti, Zr and other HFSE support this interpretation. U-Th-Pb dating of zircon from a diorite provides a lower Norian (ca. 222Ma) youngest-crystallization-age constraint, suggesting that the BSC formed in a supra-subduction setting on the South Pamir terrane prior to the collision between Central and South Pamir blocks. It was later underthrust and then obducted onto the southern margin of the closing Rushan-Pshart Ocean, which separated these two Gondwanan terranes during the Permian–Triassic. The obduction of the Bashgumbaz ophiolites can be considered as a time constraint for the collision between the South and Central Pamir terranes, which occurred within the framework of the Cimmerian orogeny that shaped the southern margin of Eurasia. Pamir Cimmerian orogeny Magmatic arc Tectonic accretion Worthington, James verfasserin aut Angiolini, Lucia verfasserin aut Leven, Ernst Ja. verfasserin aut Villa, Igor M. verfasserin aut Zanchi, Andrea verfasserin aut Enthalten in Gondwana research Amsterdam [u.a.] : Elsevier, 1997 57, Seite 170-190 Online-Ressource (DE-627)504859692 (DE-600)2213685-X (DE-576)259273449 1342-937X nnns volume:57 pages:170-190 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 57 170-190 |
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10.1016/j.gr.2018.01.009 doi (DE-627)ELV000660159 (ELSEVIER)S1342-937X(18)30036-4 DE-627 ger DE-627 rda eng 550 DE-600 Zanchetta, Stefano verfasserin aut The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the contact between the SE and SW Pamir and consists of a low-grade metamorphic association dominated by gabbros and serpentinized harzburgites with minor bodies of quartzdiorite and plagiogranite tectonically coupled to basaltic and rhyolitic volcanic products. Tectonic slices of metasedimentary rocks are interleaved within the complex. The BSC is in contact with a sedimentary unit rich in olistostostromes with exotic blocks containing a Lower Permian fauna showing affinity with Central Pamir. The BSC is intruded by a Lower Cretaceous granitic body with a U-Pb zircon age of 117Ma, crosscutting the whole complex. Petrographic, mineralogical and geochemical data suggest a supra-subduction-zone affinity for the gabbros and diorites. Significant enrichment in LILE and LREE compared to HREE, coupled with negative anomalies of Nb, Ti, Zr and other HFSE support this interpretation. U-Th-Pb dating of zircon from a diorite provides a lower Norian (ca. 222Ma) youngest-crystallization-age constraint, suggesting that the BSC formed in a supra-subduction setting on the South Pamir terrane prior to the collision between Central and South Pamir blocks. It was later underthrust and then obducted onto the southern margin of the closing Rushan-Pshart Ocean, which separated these two Gondwanan terranes during the Permian–Triassic. The obduction of the Bashgumbaz ophiolites can be considered as a time constraint for the collision between the South and Central Pamir terranes, which occurred within the framework of the Cimmerian orogeny that shaped the southern margin of Eurasia. Pamir Cimmerian orogeny Magmatic arc Tectonic accretion Worthington, James verfasserin aut Angiolini, Lucia verfasserin aut Leven, Ernst Ja. verfasserin aut Villa, Igor M. verfasserin aut Zanchi, Andrea verfasserin aut Enthalten in Gondwana research Amsterdam [u.a.] : Elsevier, 1997 57, Seite 170-190 Online-Ressource (DE-627)504859692 (DE-600)2213685-X (DE-576)259273449 1342-937X nnns volume:57 pages:170-190 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 57 170-190 |
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Zanchetta, Stefano @@aut@@ Worthington, James @@aut@@ Angiolini, Lucia @@aut@@ Leven, Ernst Ja. @@aut@@ Villa, Igor M. @@aut@@ Zanchi, Andrea @@aut@@ |
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Zanchetta, Stefano |
spellingShingle |
Zanchetta, Stefano ddc 550 misc Pamir misc Cimmerian orogeny misc Magmatic arc misc Tectonic accretion The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir |
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550 DE-600 The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir Pamir Cimmerian orogeny Magmatic arc Tectonic accretion |
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The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir |
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Zanchetta, Stefano Worthington, James Angiolini, Lucia Leven, Ernst Ja. Villa, Igor M. Zanchi, Andrea |
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the bashgumbaz complex (tajikistan): arc obduction in the cimmerian orogeny of the pamir |
title_auth |
The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir |
abstract |
We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the contact between the SE and SW Pamir and consists of a low-grade metamorphic association dominated by gabbros and serpentinized harzburgites with minor bodies of quartzdiorite and plagiogranite tectonically coupled to basaltic and rhyolitic volcanic products. Tectonic slices of metasedimentary rocks are interleaved within the complex. The BSC is in contact with a sedimentary unit rich in olistostostromes with exotic blocks containing a Lower Permian fauna showing affinity with Central Pamir. The BSC is intruded by a Lower Cretaceous granitic body with a U-Pb zircon age of 117Ma, crosscutting the whole complex. Petrographic, mineralogical and geochemical data suggest a supra-subduction-zone affinity for the gabbros and diorites. Significant enrichment in LILE and LREE compared to HREE, coupled with negative anomalies of Nb, Ti, Zr and other HFSE support this interpretation. U-Th-Pb dating of zircon from a diorite provides a lower Norian (ca. 222Ma) youngest-crystallization-age constraint, suggesting that the BSC formed in a supra-subduction setting on the South Pamir terrane prior to the collision between Central and South Pamir blocks. It was later underthrust and then obducted onto the southern margin of the closing Rushan-Pshart Ocean, which separated these two Gondwanan terranes during the Permian–Triassic. The obduction of the Bashgumbaz ophiolites can be considered as a time constraint for the collision between the South and Central Pamir terranes, which occurred within the framework of the Cimmerian orogeny that shaped the southern margin of Eurasia. |
abstractGer |
We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the contact between the SE and SW Pamir and consists of a low-grade metamorphic association dominated by gabbros and serpentinized harzburgites with minor bodies of quartzdiorite and plagiogranite tectonically coupled to basaltic and rhyolitic volcanic products. Tectonic slices of metasedimentary rocks are interleaved within the complex. The BSC is in contact with a sedimentary unit rich in olistostostromes with exotic blocks containing a Lower Permian fauna showing affinity with Central Pamir. The BSC is intruded by a Lower Cretaceous granitic body with a U-Pb zircon age of 117Ma, crosscutting the whole complex. Petrographic, mineralogical and geochemical data suggest a supra-subduction-zone affinity for the gabbros and diorites. Significant enrichment in LILE and LREE compared to HREE, coupled with negative anomalies of Nb, Ti, Zr and other HFSE support this interpretation. U-Th-Pb dating of zircon from a diorite provides a lower Norian (ca. 222Ma) youngest-crystallization-age constraint, suggesting that the BSC formed in a supra-subduction setting on the South Pamir terrane prior to the collision between Central and South Pamir blocks. It was later underthrust and then obducted onto the southern margin of the closing Rushan-Pshart Ocean, which separated these two Gondwanan terranes during the Permian–Triassic. The obduction of the Bashgumbaz ophiolites can be considered as a time constraint for the collision between the South and Central Pamir terranes, which occurred within the framework of the Cimmerian orogeny that shaped the southern margin of Eurasia. |
abstract_unstemmed |
We present a new interpretation of the Bashgumbaz Complex (BSC), a fragment of a large mafic-ultramafic nappe exposed along the Alichur Valley in the Pamir, whose significance is of paramount importance for the understanding of the Cimmerian orogeny in South Pamir. The BSC is exposed along the contact between the SE and SW Pamir and consists of a low-grade metamorphic association dominated by gabbros and serpentinized harzburgites with minor bodies of quartzdiorite and plagiogranite tectonically coupled to basaltic and rhyolitic volcanic products. Tectonic slices of metasedimentary rocks are interleaved within the complex. The BSC is in contact with a sedimentary unit rich in olistostostromes with exotic blocks containing a Lower Permian fauna showing affinity with Central Pamir. The BSC is intruded by a Lower Cretaceous granitic body with a U-Pb zircon age of 117Ma, crosscutting the whole complex. Petrographic, mineralogical and geochemical data suggest a supra-subduction-zone affinity for the gabbros and diorites. Significant enrichment in LILE and LREE compared to HREE, coupled with negative anomalies of Nb, Ti, Zr and other HFSE support this interpretation. U-Th-Pb dating of zircon from a diorite provides a lower Norian (ca. 222Ma) youngest-crystallization-age constraint, suggesting that the BSC formed in a supra-subduction setting on the South Pamir terrane prior to the collision between Central and South Pamir blocks. It was later underthrust and then obducted onto the southern margin of the closing Rushan-Pshart Ocean, which separated these two Gondwanan terranes during the Permian–Triassic. The obduction of the Bashgumbaz ophiolites can be considered as a time constraint for the collision between the South and Central Pamir terranes, which occurred within the framework of the Cimmerian orogeny that shaped the southern margin of Eurasia. |
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The Bashgumbaz Complex (Tajikistan): Arc obduction in the Cimmerian orogeny of the Pamir |
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Worthington, James Angiolini, Lucia Leven, Ernst Ja Villa, Igor M. Zanchi, Andrea |
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