Evidence for H2O-bearing fluids in the lower mantle from diamond inclusion
Evidence for H2O-bearing fluids in the lower mantle from diamond inclusion
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DOI：
10.1016/j.lithos.2016.06.023
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发表时间：
2016-11-15
期刊：
影响因子：
3.5
通讯作者：
Pearson, D. G.
中科院分区：
文献类型：
--
作者：
Palot, M.;Jacobsen, S. D.;Pearson, D. G.
在这项研究中，我们报告了巴西Sat）Luiz钻石中含有的天然铁方镁石晶体中最上部下地幔中含水流体的第一个直接证据。铁方镁石表现出镁铁氧体的出溶，这表明该组合的起源于下地幔的最上部。铁方镁石晶体中水镁石-Mg（OH）（2）沉淀物的存在反映了可能在过渡带中的含H2O流体的后期淬火，该流体在下地幔包裹体过程中被捕获。脱水熔融可能是水跨越上地幔和下地幔边界的关键过程之一。(C)2016爱思唯尔B. V.保留所有权利。
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.