期刊
LITHOS
卷 265, 期 -, 页码 237-243出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.lithos.2016.06.023
关键词
Diamond; Lower mantle; Deep water cycle; Brucite; Magnesioferrite; Ferropericlase; Dehydration melting
资金
- Division Of Earth Sciences
- Directorate For Geosciences [1452344] Funding Source: National Science Foundation
In this study, we report the first direct evidence for water-bearing fluids in the uppermost lower mantle from natural ferropericlase crystal contained within a diamond from Sat) Luiz, Brazil. The ferropericlase exhibits exsolution of magnesioferrite, which places the origin of this assemblage in the uppermost part of the lower mantle. The presence of brucite-Mg(OH)(2) precipitates in the ferropericlase crystal reflects the later-stage quenching of H2O-bearing fluid likely in the transition zone, which has been trapped during the inclusion process in the lower mantle. Dehydration melting may be one of the key processes involved in transporting water across the boundary between the upper and lower mantle. (C) 2016 Elsevier B.V. All rights reserved.
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