Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin

Abstract Two geochemically and temporally distinct components of the Mesozoic Zealandia Cordilleran arc indicate a shift from low to high Sr/Y whole rock ratios at c. 130 Ma. Recent mapping and a reappraisal of published Sr-Nd data combined with new in-situ zircon Hf isotope analyses supports a gene...

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Autores principales:	L. A. Milan, N. R. Daczko, G. L. Clarke
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/257623acf6c74679a75763416d3b5a0f
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spelling	oai:doaj.org-article:257623acf6c74679a75763416d3b5a0f2021-12-02T12:30:18ZCordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin10.1038/s41598-017-00347-w2045-2322https://doaj.org/article/257623acf6c74679a75763416d3b5a0f2017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00347-whttps://doaj.org/toc/2045-2322Abstract Two geochemically and temporally distinct components of the Mesozoic Zealandia Cordilleran arc indicate a shift from low to high Sr/Y whole rock ratios at c. 130 Ma. Recent mapping and a reappraisal of published Sr-Nd data combined with new in-situ zircon Hf isotope analyses supports a genetic relationship between the two arc components. A reappraisal of geophysical, geochemical and P-T estimates demonstrates a doubling in thickness of the arc to at least 80 km at c. 130 Ma. Contemporaneously, magmatic addition rates shifted from ~14 km3/my per km of arc to a flare-up involving ~100 km3/my per km of arc. Excursions in Sr-Nd-Hf isotopic ratios of flare-up rocks highlight the importance of crust-dominated sources. This pattern mimics Cordilleran arcs of the Americas and highlights the importance of processes occurring in the upper continental plates of subduction systems that are incompletely reconciled with secular models for continental crustal growth.L. A. MilanN. R. DaczkoG. L. ClarkeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q L. A. Milan N. R. Daczko G. L. Clarke Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin
description	Abstract Two geochemically and temporally distinct components of the Mesozoic Zealandia Cordilleran arc indicate a shift from low to high Sr/Y whole rock ratios at c. 130 Ma. Recent mapping and a reappraisal of published Sr-Nd data combined with new in-situ zircon Hf isotope analyses supports a genetic relationship between the two arc components. A reappraisal of geophysical, geochemical and P-T estimates demonstrates a doubling in thickness of the arc to at least 80 km at c. 130 Ma. Contemporaneously, magmatic addition rates shifted from ~14 km3/my per km of arc to a flare-up involving ~100 km3/my per km of arc. Excursions in Sr-Nd-Hf isotopic ratios of flare-up rocks highlight the importance of crust-dominated sources. This pattern mimics Cordilleran arcs of the Americas and highlights the importance of processes occurring in the upper continental plates of subduction systems that are incompletely reconciled with secular models for continental crustal growth.
format	article
author	L. A. Milan N. R. Daczko G. L. Clarke
author_facet	L. A. Milan N. R. Daczko G. L. Clarke
author_sort	L. A. Milan
title	Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin
title_short	Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin
title_full	Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin
title_fullStr	Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin
title_full_unstemmed	Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin
title_sort	cordillera zealandia: a mesozoic arc flare-up on the palaeo-pacific gondwana margin
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/257623acf6c74679a75763416d3b5a0f
work_keys_str_mv	AT lamilan cordillerazealandiaamesozoicarcflareuponthepalaeopacificgondwanamargin AT nrdaczko cordillerazealandiaamesozoicarcflareuponthepalaeopacificgondwanamargin AT glclarke cordillerazealandiaamesozoicarcflareuponthepalaeopacificgondwanamargin
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Cordillera Zealandia: A Mesozoic arc flare-up on the palaeo-Pacific Gondwana Margin

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