Hansen, SE, Garnero, EJ, Li, M et al. (2 more authors) (2023) Globally Distributed Subducted Materials along the Earth’s Core-Mantle Boundary: Implications 3 for Ultra-low Velocity Zones. Science Advances, 9 (14). ISSN 2375-2548
Abstract
Ultralow velocity zones (ULVZs) are the most anomalous structures within the Earth’s interior; however, given the wide range of associated characteristics (thickness and composition) reported by previous studies, the origins of ULVZs have been debated for decades. Using a recently developed seismic analysis approach, we find widespread, variable ULVZs along the core-mantle boundary (CMB) beneath a largely unsampled portion of the Southern Hemisphere. Our study region is not beneath current or recent subduction zones, but our mantle convection simulations demonstrate how heterogeneous accumulations of previously subducted materials could form on the CMB and explain our seismic observations. We further show that subducted materials can be globally distributed throughout the lowermost mantle with variable concentrations. These subducted materials, advected along the CMB, can provide an explanation for the distribution and range of reported ULVZ properties.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Copyright © 2023 The Authors. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC) (https://creativecommons.org/licenses/by-nc/4.0/). |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Funding Information: | Funder Grant number NERC (Natural Environment Research Council) NE/R012199/1 NERC (Natural Environment Research Council) NE/W005247/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 15 Mar 2023 14:25 |
Last Modified: | 26 Jul 2023 13:20 |
Status: | Published |
Publisher: | American Association for the Advancement of Science |
Identification Number: | 10.1126/sciadv.add4838 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:196999 |