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Flare-up in Cordilleran arcs controlled by fluxes in subduction water budgets
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  • Timothy Chapman,
  • Luke A. Milan,
  • Sabin Zahirovic,
  • Andrew Merdith,
  • Geoffrey L. Clarke,
  • Mingdao Sun,
  • Nathan Robert Daczko
Timothy Chapman
University of New England

Corresponding Author:[email protected]

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Luke A. Milan
The University of New England
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Sabin Zahirovic
University of Sydney
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Andrew Merdith
University of Leeds
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Geoffrey L. Clarke
University of Sydney
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Mingdao Sun
Guangzhou Institute of Geochemistry, Chinese Acadamy of Sciences
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Nathan Robert Daczko
Macquarie University
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The tempo of subduction-related magmatic activity over geological time is episodic. Despite intense study and their importance in crustal addition, the fundamental driver of these episodes remains unclear. We demonstrate quantitatively a first order relationship between arc magmatic activity and subduction flux. The volume of oceanic lithosphere entering the mantle is the key parameter that regulates the proportion of H2O entering the sub-arc. New estimates of subduction zone H2O budgets over the last 150 million-years indicate a three- to five-fold increase in the proportion of H2O entering the sub-arc during the most recent global pulse of magmatism. Step changes in H2O flux enable proportionally greater partial melting in the sub-arc. Similar magmatic pulses in the ancient Earth could be related to variability in subduction flux associated with supercontinent cycles.
28 Sep 2023Submitted to ESS Open Archive
29 Sep 2023Published in ESS Open Archive