Petrology, mineral and isotope geochemistry of the Sondalo gabbroic complex (Central Alps, Northern Italy): implications for the origin of post-Variscan magmatism
Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al...
Ausführliche Beschreibung
Gespeichert in:
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Tribuzio, R. [verfasserIn] |
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Artikel |
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| Sprache: |
Englisch |
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1999 |
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© Springer-Verlag Berlin Heidelberg 1999 |
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| Übergeordnetes Werk: |
Enthalten in: Contributions to mineralogy and petrology - Springer-Verlag, 1966, 136(1999), 1-2 vom: Juli, Seite 48-62 |
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| Übergeordnetes Werk: |
volume:136 ; year:1999 ; number:1-2 ; month:07 ; pages:48-62 |
| Links: |
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| DOI / URN: |
10.1007/s004100050523 |
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| Katalog-ID: |
OLC2070518647 |
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| 245 | 1 | 0 | |a Petrology, mineral and isotope geochemistry of the Sondalo gabbroic complex (Central Alps, Northern Italy): implications for the origin of post-Variscan magmatism |
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| 520 | |a Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma. | ||
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10.1007/s004100050523 doi (DE-627)OLC2070518647 (DE-He213)s004100050523-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Tribuzio, R. verfasserin aut Petrology, mineral and isotope geochemistry of the Sondalo gabbroic complex (Central Alps, Northern Italy): implications for the origin of post-Variscan magmatism 1999 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1999 Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma. Olivine Mantle Source Isochron Select Trace Element Deplete Mantle Source Thirlwall, M. F. aut Messiga, B. aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 136(1999), 1-2 vom: Juli, Seite 48-62 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:136 year:1999 number:1-2 month:07 pages:48-62 https://doi.org/10.1007/s004100050523 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 136 1999 1-2 07 48-62 |
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10.1007/s004100050523 doi (DE-627)OLC2070518647 (DE-He213)s004100050523-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Tribuzio, R. verfasserin aut Petrology, mineral and isotope geochemistry of the Sondalo gabbroic complex (Central Alps, Northern Italy): implications for the origin of post-Variscan magmatism 1999 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1999 Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma. Olivine Mantle Source Isochron Select Trace Element Deplete Mantle Source Thirlwall, M. F. aut Messiga, B. aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 136(1999), 1-2 vom: Juli, Seite 48-62 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:136 year:1999 number:1-2 month:07 pages:48-62 https://doi.org/10.1007/s004100050523 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 136 1999 1-2 07 48-62 |
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10.1007/s004100050523 doi (DE-627)OLC2070518647 (DE-He213)s004100050523-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Tribuzio, R. verfasserin aut Petrology, mineral and isotope geochemistry of the Sondalo gabbroic complex (Central Alps, Northern Italy): implications for the origin of post-Variscan magmatism 1999 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1999 Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma. Olivine Mantle Source Isochron Select Trace Element Deplete Mantle Source Thirlwall, M. F. aut Messiga, B. aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 136(1999), 1-2 vom: Juli, Seite 48-62 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:136 year:1999 number:1-2 month:07 pages:48-62 https://doi.org/10.1007/s004100050523 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 136 1999 1-2 07 48-62 |
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10.1007/s004100050523 doi (DE-627)OLC2070518647 (DE-He213)s004100050523-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Tribuzio, R. verfasserin aut Petrology, mineral and isotope geochemistry of the Sondalo gabbroic complex (Central Alps, Northern Italy): implications for the origin of post-Variscan magmatism 1999 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1999 Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma. Olivine Mantle Source Isochron Select Trace Element Deplete Mantle Source Thirlwall, M. F. aut Messiga, B. aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 136(1999), 1-2 vom: Juli, Seite 48-62 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:136 year:1999 number:1-2 month:07 pages:48-62 https://doi.org/10.1007/s004100050523 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 136 1999 1-2 07 48-62 |
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10.1007/s004100050523 doi (DE-627)OLC2070518647 (DE-He213)s004100050523-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Tribuzio, R. verfasserin aut Petrology, mineral and isotope geochemistry of the Sondalo gabbroic complex (Central Alps, Northern Italy): implications for the origin of post-Variscan magmatism 1999 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag Berlin Heidelberg 1999 Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma. Olivine Mantle Source Isochron Select Trace Element Deplete Mantle Source Thirlwall, M. F. aut Messiga, B. aut Enthalten in Contributions to mineralogy and petrology Springer-Verlag, 1966 136(1999), 1-2 vom: Juli, Seite 48-62 (DE-627)129068721 (DE-600)1616-0 (DE-576)014400367 0010-7999 nnns volume:136 year:1999 number:1-2 month:07 pages:48-62 https://doi.org/10.1007/s004100050523 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2010 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4277 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4311 GBV_ILN_4319 GBV_ILN_4323 TE 1000 AR 136 1999 1-2 07 48-62 |
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petrology, mineral and isotope geochemistry of the sondalo gabbroic complex (central alps, northern italy): implications for the origin of post-variscan magmatism |
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Petrology, mineral and isotope geochemistry of the Sondalo gabbroic complex (Central Alps, Northern Italy): implications for the origin of post-Variscan magmatism |
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Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma. © Springer-Verlag Berlin Heidelberg 1999 |
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Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma. © Springer-Verlag Berlin Heidelberg 1999 |
| abstract_unstemmed |
Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma. © Springer-Verlag Berlin Heidelberg 1999 |
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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">OLC2070518647</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20230402225507.0</controlfield><controlfield tag="007">tu</controlfield><controlfield tag="008">200820s1999 xx ||||| 00| ||eng c</controlfield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.1007/s004100050523</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)OLC2070518647</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-He213)s004100050523-p</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="082" ind1="0" ind2="4"><subfield code="a">550</subfield><subfield code="q">VZ</subfield></datafield><datafield tag="084" ind1=" " ind2=" "><subfield code="a">13</subfield><subfield code="2">ssgn</subfield></datafield><datafield tag="084" ind1=" " ind2=" "><subfield code="a">TE 1000</subfield><subfield code="q">VZ</subfield><subfield code="2">rvk</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">Tribuzio, R.</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Petrology, mineral and isotope geochemistry of the Sondalo gabbroic complex (Central Alps, Northern Italy): implications for the origin of post-Variscan magmatism</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1999</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">ohne Hilfsmittel zu benutzen</subfield><subfield code="b">n</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Band</subfield><subfield code="b">nc</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">© Springer-Verlag Berlin Heidelberg 1999</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract The origin of the Sondalo gabbroic complex has been unravelled by means of a petrological study of the least evolved rocks, troctolites to norites containing up to 20% of anhedral clinopyroxene and titanian pargasite. Pyroxenes and titanian pargasite from the troctolites have higher Mg, Al and Cr, and lower Mn than those from the norites, whereas plagioclase does not show systematic compositional variations (An ca. 65 mol%). The variation trend of anorthite content of plagioclase versus the forsterite content of olivine differs from that of arc-related gabbroic rocks. Plagioclase, clinopyroxene, orthopyroxene and titanian pargasite were analyzed for REE and selected trace elements by ion microprobe. Application of crystal/liquid partition coefficients to trace element mineral compositions suggests that the parental liquids of both troctolites and norites had tholeiitic affinity and were slightly LREE and LILE enriched relative to N-MORB. A troctolite and a norite give Sm-Nd mineral isochron ages of 300 ± 12 Ma and 280 ± 10 Ma. Plagioclase-amphibole Rb-Sr isochron ages are 266 ± 10 Ma and 269 ± 16 Ma for the same rock samples, and they are interpreted to represent cooling ages. The Nd-Sr-O isotopic compositions indicate that a substantial crustal contribution was involved in the petrogenesis of the norite, which has low $ ɛ_{Nd} $(290 Ma), high 87Sr/86Sr(290 Ma) and high $ δ^{18} $$ O_{Px} $ (−2.6, 0.7057 and +7.9‰, respectively) compared with the troctolites. We thus conclude that the troctolite/norite association formed by concomitant fractional crystallization and crustal assimilation. The somewhat elevated $ δ^{18} $$ O_{Cpx} $ (+6.4‰) and the relatively low forsterite contents in olivine suggest that the parental liquids of the troctolites had already been evolved through an AFC type process. The $ ɛ_{Nd} $(290 Ma) and 87Sr/86Sr(290 Ma) of these rocks (ranging from +2.8 to +4.4 and from 0.7037 to 0.7040, respectively) probably do not reflect the $ ɛ_{Nd} $ and Sr isotopic compositions of their mantle source, and it is thus unclear whether the primary melts were derived from a slightly enriched or from a depleted mantle source. The Sondalo gabbroic complex was most likely associated with the post-Variscan gabbroic complexes of the Alpine belt. These gabbroic complexes can be ascribed to the intrusion at different crustal levels of tholeiitic mantle-derived melts and were emplaced in the time span of 300–270 Ma.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Olivine</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Mantle Source</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Isochron</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Select Trace Element</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Deplete Mantle Source</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Thirlwall, M. F.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Messiga, B.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Enthalten in</subfield><subfield code="t">Contributions to mineralogy and petrology</subfield><subfield code="d">Springer-Verlag, 1966</subfield><subfield code="g">136(1999), 1-2 vom: Juli, Seite 48-62</subfield><subfield code="w">(DE-627)129068721</subfield><subfield code="w">(DE-600)1616-0</subfield><subfield code="w">(DE-576)014400367</subfield><subfield code="x">0010-7999</subfield><subfield code="7">nnns</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:136</subfield><subfield code="g">year:1999</subfield><subfield code="g">number:1-2</subfield><subfield code="g">month:07</subfield><subfield code="g">pages:48-62</subfield></datafield><datafield tag="856" ind1="4" ind2="1"><subfield code="u">https://doi.org/10.1007/s004100050523</subfield><subfield code="z">lizenzpflichtig</subfield><subfield code="3">Volltext</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_A</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SYSFLAG_A</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_OLC</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-GEO</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OPC-GGO</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_21</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_22</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_30</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_31</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_40</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_65</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_70</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2004</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2010</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2018</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_2027</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4012</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4046</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4112</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4277</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4305</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4306</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4311</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4319</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ILN_4323</subfield></datafield><datafield tag="936" ind1="r" ind2="v"><subfield code="a">TE 1000</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">136</subfield><subfield code="j">1999</subfield><subfield code="e">1-2</subfield><subfield code="c">07</subfield><subfield code="h">48-62</subfield></datafield></record></collection>
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