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- Publisher Website: 10.1126/sciadv.1500815
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Article: Earth Sciences: Compositional mantle layering revealed by slab stagnation at ~1000-km depth
Title | Earth Sciences: Compositional mantle layering revealed by slab stagnation at ~1000-km depth |
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Authors | |
Issue Date | 2015 |
Citation | Science Advances, 2015, v. 1, n. 11, article no. e1500815 How to Cite? |
Abstract | © 2015 The Authors, some rights reserved. Improved constraints on lower-mantle composition are fundamental to understand the accretion, differentiation, and thermochemical evolution of our planet. Cosmochemical arguments indicate that lower-mantle rocks may be enriched in Si relative to upper-mantle pyrolite, whereas seismic tomography images suggest whole-mantle convection and hence appear to imply efficient mantle mixing. This study reconciles cosmochemical and geophysical constraints using the stagnation of some slab segments at ~1000-km depth as the key observation. Through numerical modeling of subduction, we show that lower-mantle enrichment in intrinsically dense basaltic lithologies can render slabs neutrally buoyant in the uppermost lower mantle. Slab stagnation (at depths of ~660 and ~1000 km) and unimpeded slab sinking to great depths can coexist if the basalt fraction is ~8% higher in the lower mantle than in the upper mantle, equivalent to a lower-mantle Mg/Si of ~1.18. Global-scale geodynamic models demonstrate that such a moderate compositional gradient across the mantle can persist in the presence of whole-mantle convection. |
Persistent Identifier | http://hdl.handle.net/10722/264968 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Ballmer, Maxim D. | - |
dc.contributor.author | Schmerr, Nicholas C. | - |
dc.contributor.author | Nakagawa, Takashi | - |
dc.contributor.author | Ritsema, Jeroen | - |
dc.date.accessioned | 2018-11-08T01:35:27Z | - |
dc.date.available | 2018-11-08T01:35:27Z | - |
dc.date.issued | 2015 | - |
dc.identifier.citation | Science Advances, 2015, v. 1, n. 11, article no. e1500815 | - |
dc.identifier.uri | http://hdl.handle.net/10722/264968 | - |
dc.description.abstract | © 2015 The Authors, some rights reserved. Improved constraints on lower-mantle composition are fundamental to understand the accretion, differentiation, and thermochemical evolution of our planet. Cosmochemical arguments indicate that lower-mantle rocks may be enriched in Si relative to upper-mantle pyrolite, whereas seismic tomography images suggest whole-mantle convection and hence appear to imply efficient mantle mixing. This study reconciles cosmochemical and geophysical constraints using the stagnation of some slab segments at ~1000-km depth as the key observation. Through numerical modeling of subduction, we show that lower-mantle enrichment in intrinsically dense basaltic lithologies can render slabs neutrally buoyant in the uppermost lower mantle. Slab stagnation (at depths of ~660 and ~1000 km) and unimpeded slab sinking to great depths can coexist if the basalt fraction is ~8% higher in the lower mantle than in the upper mantle, equivalent to a lower-mantle Mg/Si of ~1.18. Global-scale geodynamic models demonstrate that such a moderate compositional gradient across the mantle can persist in the presence of whole-mantle convection. | - |
dc.language | eng | - |
dc.relation.ispartof | Science Advances | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.title | Earth Sciences: Compositional mantle layering revealed by slab stagnation at ~1000-km depth | - |
dc.type | Article | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1126/sciadv.1500815 | - |
dc.identifier.scopus | eid_2-s2.0-84960908629 | - |
dc.identifier.volume | 1 | - |
dc.identifier.issue | 11 | - |
dc.identifier.spage | article no. e1500815 | - |
dc.identifier.epage | article no. e1500815 | - |
dc.identifier.eissn | 2375-2548 | - |
dc.identifier.isi | WOS:000216604200012 | - |
dc.identifier.issnl | 2375-2548 | - |