Hydrous upwelling across the mantle transition zone beneath the Afar Triple Junction
Hydrous upwelling across the mantle transition zone beneath the Afar Triple Junction
复制标题
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:
影响因子:
--
通讯作者:
Thompson D
中科院分区:
文献类型:
--
作者:
Thompson D
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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影响因子:
64.8
作者:
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通讯作者:
M. Assumpção
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
P. L. Mcfadden;B. Drummond;S. Kravis
影响因子:
18.3
作者:
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通讯作者:
C. Rychert;J. Hammond;N. Harmon;J. Kendall;D. Keir;C. Ebinger;I. Bastow;A. Ayele;M. Belachew;G. Stuart
DOI:
10.1029/2002eo000296
发表时间:
2002
期刊:
Eos, Transactions American Geophysical Union
影响因子:
--
作者:
A. Nyblade;C. Langston
通讯作者:
C. Langston