Revealing the link between A-type granites and hottest melts from residual metasedimentary crust
Among S-, I-, and A-type granites, the latter are the most debated in terms of origin, and metasedimentary crust is usually discarded as a potential source. Here we tackle this issue by adopting an in-source perspective, rather than focusing on the final product (granite), documenting the occurrence...
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Geological Society of America
2023
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Online Access: | https://hdl.handle.net/11577/3496983 https://doi.org/10.1130/G51097.1 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/51/9/845/624382/Revealing-the-link-between-A-type-granites-and |
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ftunivpadovairis:oai:www.research.unipd.it:11577/3496983 2024-09-15T17:43:03+00:00 Revealing the link between A-type granites and hottest melts from residual metasedimentary crust B. B. Carvalho O. Bartoli B. Cesare M. Satish-Kumar M. Petrelli T. Kawakami T. Hokada M. Gilio Carvalho, B. B. Bartoli, O. Cesare, B. Satish-Kumar, M. Petrelli, M. Kawakami, T. Hokada, T. Gilio, M. 2023 STAMPA https://hdl.handle.net/11577/3496983 https://doi.org/10.1130/G51097.1 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/51/9/845/624382/Revealing-the-link-between-A-type-granites-and eng eng Geological Society of America info:eu-repo/semantics/altIdentifier/wos/WOS:001091244000009 volume:51 issue:9 firstpage:845 lastpage:849 numberofpages:5 journal:GEOLOGY https://hdl.handle.net/11577/3496983 doi:10.1130/G51097.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85168083147 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/51/9/845/624382/Revealing-the-link-between-A-type-granites-and info:eu-repo/semantics/openAccess info:eu-repo/semantics/article 2023 ftunivpadovairis https://doi.org/10.1130/G51097.1 2024-07-22T23:36:55Z Among S-, I-, and A-type granites, the latter are the most debated in terms of origin, and metasedimentary crust is usually discarded as a potential source. Here we tackle this issue by adopting an in-source perspective, rather than focusing on the final product (granite), documenting the occurrence of pristine melt inclusions (MIs) in garnet from residual metapelitic ultrahigh-temperature (UHT) granulite from East Antarctica. Coexistence of sapphirine + quartz, phase equilibria calculations, and Zr-in-rutile thermometry indicate that MIs trapped UHT melts formed at peak conditions (930–1000 °C) from a residual metapelitic source. MIs are granitic with weakly peraluminous to weakly peralkaline affinity, ferroan character, high alkali contents, high K/Na and Ga/Al, and low Ca, Ba, Sr, and H2O concentrations. These features and geochemical modeling indicate that MIs represent primary melts for high-SiO2 A-type granites. Therefore, MIs reveal the missing link between A-type granites and the hottest metasedimentary crust. Voluminous amounts of slightly peraluminous, high-SiO2 A-type granites can be produced in large, residual UHT terranes such as those of eastern Gondwana. Our results provide a wider view of processes responsible for granite formation and show that a larger variety of granites must be considered in models of the effects of UHT anatexis on crustal differentiation. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Padua Research Archive (IRIS - Università degli Studi di Padova) Geology 51 9 845 849 |
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Open Polar |
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Padua Research Archive (IRIS - Università degli Studi di Padova) |
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ftunivpadovairis |
language |
English |
description |
Among S-, I-, and A-type granites, the latter are the most debated in terms of origin, and metasedimentary crust is usually discarded as a potential source. Here we tackle this issue by adopting an in-source perspective, rather than focusing on the final product (granite), documenting the occurrence of pristine melt inclusions (MIs) in garnet from residual metapelitic ultrahigh-temperature (UHT) granulite from East Antarctica. Coexistence of sapphirine + quartz, phase equilibria calculations, and Zr-in-rutile thermometry indicate that MIs trapped UHT melts formed at peak conditions (930–1000 °C) from a residual metapelitic source. MIs are granitic with weakly peraluminous to weakly peralkaline affinity, ferroan character, high alkali contents, high K/Na and Ga/Al, and low Ca, Ba, Sr, and H2O concentrations. These features and geochemical modeling indicate that MIs represent primary melts for high-SiO2 A-type granites. Therefore, MIs reveal the missing link between A-type granites and the hottest metasedimentary crust. Voluminous amounts of slightly peraluminous, high-SiO2 A-type granites can be produced in large, residual UHT terranes such as those of eastern Gondwana. Our results provide a wider view of processes responsible for granite formation and show that a larger variety of granites must be considered in models of the effects of UHT anatexis on crustal differentiation. |
author2 |
Carvalho, B. B. Bartoli, O. Cesare, B. Satish-Kumar, M. Petrelli, M. Kawakami, T. Hokada, T. Gilio, M. |
format |
Article in Journal/Newspaper |
author |
B. B. Carvalho O. Bartoli B. Cesare M. Satish-Kumar M. Petrelli T. Kawakami T. Hokada M. Gilio |
spellingShingle |
B. B. Carvalho O. Bartoli B. Cesare M. Satish-Kumar M. Petrelli T. Kawakami T. Hokada M. Gilio Revealing the link between A-type granites and hottest melts from residual metasedimentary crust |
author_facet |
B. B. Carvalho O. Bartoli B. Cesare M. Satish-Kumar M. Petrelli T. Kawakami T. Hokada M. Gilio |
author_sort |
B. B. Carvalho |
title |
Revealing the link between A-type granites and hottest melts from residual metasedimentary crust |
title_short |
Revealing the link between A-type granites and hottest melts from residual metasedimentary crust |
title_full |
Revealing the link between A-type granites and hottest melts from residual metasedimentary crust |
title_fullStr |
Revealing the link between A-type granites and hottest melts from residual metasedimentary crust |
title_full_unstemmed |
Revealing the link between A-type granites and hottest melts from residual metasedimentary crust |
title_sort |
revealing the link between a-type granites and hottest melts from residual metasedimentary crust |
publisher |
Geological Society of America |
publishDate |
2023 |
url |
https://hdl.handle.net/11577/3496983 https://doi.org/10.1130/G51097.1 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/51/9/845/624382/Revealing-the-link-between-A-type-granites-and |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:001091244000009 volume:51 issue:9 firstpage:845 lastpage:849 numberofpages:5 journal:GEOLOGY https://hdl.handle.net/11577/3496983 doi:10.1130/G51097.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85168083147 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/51/9/845/624382/Revealing-the-link-between-A-type-granites-and |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1130/G51097.1 |
container_title |
Geology |
container_volume |
51 |
container_issue |
9 |
container_start_page |
845 |
op_container_end_page |
849 |
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1810489887879593984 |