Covariation of Slab Tracers, Volatiles, and Oxidation During Subduction Initiation

Brounce, Maryjo; Reagan, Mark K.; Kelley, Katherine A.; Cottrell, Elizabeth; Shimizu, Kenji; Almeev, Renat

doi:10.1029/2021GC009823

Title: Covariation of Slab Tracers, Volatiles, and Oxidation During Subduction Initiation

Journal Article · Tue Jun 08 00:00:00 EDT 2021 · Geochemistry, Geophysics, Geosystems

DOI:https://doi.org/10.1029/2021GC009823· OSTI ID:1787406

^[1]; Reagan, Mark K. ^[2];

^[3];

^[4]; Shimizu, Kenji ^[5];

^[6]

Earth and Planetary Sciences University of California Riverside Riverside CA USA
Department of Earth and Environmental Sciences University of Iowa Iowa City IA USA
Graduate School of Oceanography University of Rhode Island Narragansett RI USA
National Museum of Natural History Smithsonian Institution Washington DC USA
Kochi Institute for Core Sample Research Japan Agency for Marine‐Earth Science and Technology (JAMSTEC) Nankoku City Japan
Leibniz University of Hannover Institute of Mineralogy Hannover Germany

Abstract Subduction‐related lavas have higher Fe ³⁺ /∑Fe than midocean ridge basalts (MORB). Hypotheses for this offset include imprint from subducting slabs and differentiation in thickened crust. These ideas are readily tested through examination of the time‐dependent evolution of slab‐derived signatures, thickening crust of the overriding plate, and evolving redox during subduction initiation. Here, we present Fe ³⁺ /ΣFe and volatile element abundances of volcanic glasses recovered from International Ocean Discovery Program (IODP) Expedition 352 to the Izu‐Bonin‐Mariana (IBM) forearc. The samples include forearc basalts (FAB) that are stratigraphically overlain by low‐ and high‐silica boninite lavas. The FAB glasses have 0.18–0.85 wt% H ₂ O, 75–233 ppm CO ₂ , S contents controlled by saturation with a sulfide phase (602–1,386 ppm), Ba/La from 3.9‐10, and Fe ³⁺ /ΣFe ratios from 0.136 to 0.177. These compositions are similar to MORB and suggest that decompression melting of dry and reduced mantle dominates the earliest stages of subduction initiation. Low‐ and high‐silica boninite glasses have 1.51–3.19 wt% H ₂ O, CO ₂ below detection, S contents below those required for sulfide saturation (5–235 ppm), Ba/La from 11 to 29, and Fe ³⁺ /∑Fe from 0.181 to 0.225. The compositions are broadly similar to modern arc lavas in the IBM arc. These data demonstrate that the establishment of fluid‐fluxed melting of the mantle, which occurs in just 0.6–1.2 my after subduction initiation, is synchronous with the production of oxidized, mantle‐derived magmas. The coherence of high Fe ³⁺ /∑Fe and Ba/La ratios with high H ₂ O contents in Expedition 352 glasses and the modern IBM arc rocks strongly links the production of oxidized arc magmas to signatures of slab dehydration.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐FG02‐94ER14466; DE‐AC02‐06CH11357

OSTI ID:: 1787406

Journal Information:: Geochemistry, Geophysics, Geosystems, Journal Name: Geochemistry, Geophysics, Geosystems Vol. 22 Journal Issue: 6; ISSN 1525-2027

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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