Titanium and iron isotopic records of granitoid crust production in diverse Archean cratons
Archean granitoid provides critical clues on how Earth's felsic crust was established and its geodynamics evolved. In this study, we present Fe-Ti isotope and trace-element data for granitoids (mostly TTGs) from the ∼3.8-3.6 Ga Itsaq Gneiss Complex and ∼3.3 Ga East Pilbara Terrane, Pilbara Crat...
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ftunivwollongong:oai:ro.uow.edu.au:test2021-14718 2023-10-09T21:52:02+02:00 Titanium and iron isotopic records of granitoid crust production in diverse Archean cratons Zhang, Zhe J. Dauphas, Nicolas Johnson, Aleisha C. Aarons, Sarah M. Bennett, Vickie C. Nutman, Allen P. MacLennan, Scott Schoene, Blair 2023-10-15T07:00:00Z https://ro.uow.edu.au/test2021/9171 https://doi.org/10.1016/j.epsl.2023.118342 unknown Research Online https://ro.uow.edu.au/test2021/9171 doi:10.1016/j.epsl.2023.118342 https://doi.org/10.1016/j.epsl.2023.118342 Scopus Harvesting Series Archean continental crust Ti isotopes TTG text 2023 ftunivwollongong https://doi.org/10.1016/j.epsl.2023.118342 2023-09-18T22:24:48Z Archean granitoid provides critical clues on how Earth's felsic crust was established and its geodynamics evolved. In this study, we present Fe-Ti isotope and trace-element data for granitoids (mostly TTGs) from the ∼3.8-3.6 Ga Itsaq Gneiss Complex and ∼3.3 Ga East Pilbara Terrane, Pilbara Craton. TTGs from those localities and several other cratons follow the same Ti isotopic fractionation trend as modern calc-alkaline rocks. This similarity hides important petrogenetic differences as partial melting could have played a much more important role in establishing the felsic character of TTGs compared to modern granites of calc-alkaline affinity. Our thermodynamics-based modeling of isotopic fractionation shows that partial melting of hydrated metabasite can explain the Fe and Ti isotopic compositions of many TTGs but reworking of tonalite crust is needed to explain the most extreme compositions. The same Ti isotopic fractionation trends have been found now in several cratons (West Greenland, Slave, Pilbara, and Kaapvaal cratons) in granitoids formed in different geothermal gradients, meaning that it was likely a global signature of the Archean crust. Sediment provenance studies that use those TTG compositions and point to a primarily felsic crust in the Archean are therefore valid. Text Greenland University of Wollongong, Australia: Research Online Greenland Earth and Planetary Science Letters 620 118342 |
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Open Polar |
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University of Wollongong, Australia: Research Online |
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ftunivwollongong |
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unknown |
topic |
Archean continental crust Ti isotopes TTG |
spellingShingle |
Archean continental crust Ti isotopes TTG Zhang, Zhe J. Dauphas, Nicolas Johnson, Aleisha C. Aarons, Sarah M. Bennett, Vickie C. Nutman, Allen P. MacLennan, Scott Schoene, Blair Titanium and iron isotopic records of granitoid crust production in diverse Archean cratons |
topic_facet |
Archean continental crust Ti isotopes TTG |
description |
Archean granitoid provides critical clues on how Earth's felsic crust was established and its geodynamics evolved. In this study, we present Fe-Ti isotope and trace-element data for granitoids (mostly TTGs) from the ∼3.8-3.6 Ga Itsaq Gneiss Complex and ∼3.3 Ga East Pilbara Terrane, Pilbara Craton. TTGs from those localities and several other cratons follow the same Ti isotopic fractionation trend as modern calc-alkaline rocks. This similarity hides important petrogenetic differences as partial melting could have played a much more important role in establishing the felsic character of TTGs compared to modern granites of calc-alkaline affinity. Our thermodynamics-based modeling of isotopic fractionation shows that partial melting of hydrated metabasite can explain the Fe and Ti isotopic compositions of many TTGs but reworking of tonalite crust is needed to explain the most extreme compositions. The same Ti isotopic fractionation trends have been found now in several cratons (West Greenland, Slave, Pilbara, and Kaapvaal cratons) in granitoids formed in different geothermal gradients, meaning that it was likely a global signature of the Archean crust. Sediment provenance studies that use those TTG compositions and point to a primarily felsic crust in the Archean are therefore valid. |
format |
Text |
author |
Zhang, Zhe J. Dauphas, Nicolas Johnson, Aleisha C. Aarons, Sarah M. Bennett, Vickie C. Nutman, Allen P. MacLennan, Scott Schoene, Blair |
author_facet |
Zhang, Zhe J. Dauphas, Nicolas Johnson, Aleisha C. Aarons, Sarah M. Bennett, Vickie C. Nutman, Allen P. MacLennan, Scott Schoene, Blair |
author_sort |
Zhang, Zhe J. |
title |
Titanium and iron isotopic records of granitoid crust production in diverse Archean cratons |
title_short |
Titanium and iron isotopic records of granitoid crust production in diverse Archean cratons |
title_full |
Titanium and iron isotopic records of granitoid crust production in diverse Archean cratons |
title_fullStr |
Titanium and iron isotopic records of granitoid crust production in diverse Archean cratons |
title_full_unstemmed |
Titanium and iron isotopic records of granitoid crust production in diverse Archean cratons |
title_sort |
titanium and iron isotopic records of granitoid crust production in diverse archean cratons |
publisher |
Research Online |
publishDate |
2023 |
url |
https://ro.uow.edu.au/test2021/9171 https://doi.org/10.1016/j.epsl.2023.118342 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Scopus Harvesting Series |
op_relation |
https://ro.uow.edu.au/test2021/9171 doi:10.1016/j.epsl.2023.118342 https://doi.org/10.1016/j.epsl.2023.118342 |
op_doi |
https://doi.org/10.1016/j.epsl.2023.118342 |
container_title |
Earth and Planetary Science Letters |
container_volume |
620 |
container_start_page |
118342 |
_version_ |
1779315154830229504 |