Hydrous upwelling across the mantle transition zone beneath the Afar Triple Junction

Hydrous upwelling across the mantle transition zone beneath the Afar Triple Junction
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穿过阿法尔三重交界处下方地幔过渡带的含水上升流

DOI:
10.1002/2014gc005648
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发表时间:
2015
期刊:
Geochemistry, Geophysics, Geosystems
影响因子:
--
通讯作者:
Thompson D
Thompson D
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--
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作者:
Thompson D

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驱动化学不均匀性从下地幔到上地幔上涌的机制(例如,热浮力与成分浮力)是我们理解整个地幔对流过程的关键。我们解决这些问题,通过接收器功能的研究,从最近的部署位于阿法尔三重结,与深部地幔上涌的位置,新的地震数据。上地幔和地幔过渡带结构的详细图像阐明了深入了解地球深部上涌性质的特征。在地幔过渡带正上方的地震低速层被解释为稳定的熔融层,沿着有一个突出的520 km的不连续性,表明存在含水上升流。一个相对均匀的过渡区厚度在整个区域表明,弱的热异常(<100 K)可能存在,上涌必须至少部分由成分浮力驱动。结果表明,下地幔是一个来源的挥发分丰富,化学独特的隆起,影响上地幔的结构,并可能的表面熔岩的化学。
The mechanisms that drive the upwelling of chemical heterogeneity from the lower to upper mantle (e.g., thermal versus compositional buoyancy) are key to our understanding of whole mantle convective processes. We address these issues through a receiver function study on new seismic data from recent deployments located on the Afar Triple Junction, a location associated with deep mantle upwelling. The detailed images of upper mantle and mantle transition zone structure illuminate features that give insights into the nature of upwelling from the deep Earth. A seismic low‐velocity layer directly above the mantle transition zone, interpreted as a stable melt layer, along with a prominent 520 km discontinuity suggest the presence of a hydrous upwelling. A relatively uniform transition zone thickness across the region suggests a weak thermal anomaly (<100 K) may be present and that upwelling must be at least partly driven by compositional buoyancy. The results suggest that the lower mantle is a source of volatile rich, chemically distinct upwellings that influence the structure of the upper mantle, and potentially the chemistry of surface lavas.
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