Can Hot and Cold Slabs Transport Water Into the Deep Mantle Beyond Subduction Zone Magmatism?
Document Type
Article
Publication Date
2024
Keywords
Deep Water Cycling, Subduction Zone, Eastern China Intraplate Magmatism, Japan-ryukyu Convergent Margin, Slab Thermal State
Digital Object Identifier (DOI)
https://doi.org/10.1029/2024GC011694
Abstract
The slab thermal state model predicts that only cold slabs should retain some of their intra-slab water beyond subduction zones, while warmer slabs should be nearly dry past the volcanic arc front. Such predictions are yet to be fully tested, as they mostly rely on numerical modeling. To further test the slab thermal model, here we have examined slab-sensitive elemental and isotopic tracers in recently erupted basalts (< 5 Myr) from along and across an arc transect at end-member types of cold (NE Japan) and hot subduction zones (SW Japan and Ryukyu) and beyond (eastern China intraplate volcanism). We show that the oceanic crust and the incoming hydrated mantle from the cold subducted Pacific plate are the main water carriers beyond subduction zones. Only cold slabs may thus recycle part of their intra-slab H2O into the lower mantle. Warmer slabs are too dry past the back-arc or too short-lived to exert a first order control on deep water recycling.
Rights Information
This work is licensed under a Creative Commons Attribution 4.0 License.
Was this content written or created while at USF?
Yes
Citation / Publisher Attribution
Geochemistry, Geophysics, Geosystems, v. 26, art. e2024GC011694
Scholar Commons Citation
Riberio, Julia M.; Ryan, Jeff; and Wu, Jonny, "Can Hot and Cold Slabs Transport Water Into the Deep Mantle Beyond Subduction Zone Magmatism?" (2024). School of Geosciences Faculty and Staff Publications. 2391.
https://digitalcommons.usf.edu/geo_facpub/2391
