Cordillera zealandia: a mesozoic arc fare-up on the palaeo-pacific Gondwana Margin

L. A. Milan, N. R. Daczko, G. L. Clarke

Research output: Contribution to journalArticleResearchpeer-review

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 fare-up involving ∼100 km3/my per km of arc. Excursions in Sr-Nd-Hf isotopic ratios of fare-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.

LanguageEnglish
Article number261
Pages1-9
Number of pages9
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 21 Mar 2017

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cordillera
Gondwana
isotopic ratio
rock
zircon
subduction
isotope
crust
in situ
Americas
rate

Bibliographical note

Copyright the Author(s) 2017. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Cite this

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title = "Cordillera zealandia: a mesozoic arc fare-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 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 fare-up involving ∼100 km3/my per km of arc. Excursions in Sr-Nd-Hf isotopic ratios of fare-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.",
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Cordillera zealandia : a mesozoic arc fare-up on the palaeo-pacific Gondwana Margin. / Milan, L. A.; Daczko, N. R.; Clarke, G. L.

In: Scientific Reports, Vol. 7, 261, 21.03.2017, p. 1-9.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Milan, L. A.

AU - Daczko, N. R.

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