Author(s) |
Chapman, Timothy
Milan, Luke A
Zahirovic, Sabin
Merdith, Andrew S
Clarke, Geoffrey L
Sun, Mingdao
Daczko, Nathan R
|
Publication Date |
2024-10-08
|
Abstract |
<p>The tempo of subduction-related magmatic activity over geological time is episodic. Despite intense study and its importance to crustal growth, the fundamental drivers of this episodicity remains unclear. We demonstrate quantitatively a first order relationship between arc flare-up events and high subduction flux. The volume of oceanic lithosphere entering the mantle is the key parameter that regulates the proportion and rate of H<sub>2</sub>O entering the sub-arc. New estimates of subduction zone H<sub>2</sub>O flux over the last 150 million-years indicate a three-to five-fold increase in the proportion of H<sub>2</sub>O entering the sub-arc during the most recent global pulse of magmatism. Step changes in H<sub>2</sub>O flux enable proportionally greater partial melting in the sub-arc mantle leading to a flare-up episode. Similar magmatic flare-ups in the ancient Earth could be related to variability in slab flux associated with supercontinent cycles.</p>
|
Citation |
Tectonophysics, v.888, p. 1-11
|
ISSN |
1879-3266
0040-1951
|
Link | |
Publisher |
Elsevier BV
|
Title |
Flare-up in Cordilleran arcs controlled by fluxes in subduction water budgets
|
Type of document |
Journal Article
|
Entity Type |
Publication
|
Name | Size | format | Description | Link |
---|