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- W2105557198 endingPage "1782" @default.
- W2105557198 startingPage "1761" @default.
- W2105557198 abstract "We present an investigation of B–Be–10Be–εNd systematics of the incoming crust and across the wide, active Kurile arc in the NW Pacific ocean basin to address the role of recent sediment incorporation in arc magmas as a function of depth to the Wadati–Benioff zone. The 10Be flux ratio (8–14%) through the arc constrains the fate of sediments subducted at the trench and requires that a minimum ∼10 m of the sediment column must reach the depths of magma generation. Enrichments in subducted sediment-derived 10Be in rear-arc lavas are comparable with those in the volcanic front, despite longer subduction transit times, and require a mechanism for the prolonged release of 10Be from the subducting slab. Cross-arc 10Be enrichments, together with drastic reductions in B/Be, imply a protracted stability of their primary mineralogical host in subducted sediment, white mica (phengite). The persistence of phengite constrains slab surface temperatures to be <950°C to 165 km depth and limits the extent of partial melting of the slab to <20%. The simplest interpretation of combined incoming sediment and cross-arc B/Be–10Be/9Be–εNd systematics is that the agent of element transfer changes from aqueous fluid-dominated beneath the volcanic front to melt-like beneath the deeper regions of the arc." @default.
- W2105557198 created "2016-06-24" @default.
- W2105557198 creator A5013747054 @default.
- W2105557198 creator A5059731789 @default.
- W2105557198 creator A5085114232 @default.
- W2105557198 date "2010-07-17" @default.
- W2105557198 modified "2023-09-25" @default.
- W2105557198 title "Incorporation of Subducted Slab-derived Sediment and Fluid in Arc Magmas: B-Be-10Be- Nd Systematics of the Kurile Convergent Margin, Russia" @default.
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- W2105557198 doi "https://doi.org/10.1093/petrology/egq038" @default.