Mantle hydration and the role of water in the generation of large igneous provinces
|Author:||Liu, Jia1,2; Xia, Qun-Ke1; Kuritani, Takeshi3;|
1School of Earth Sciences, Zhejiang University, Hangzhou, 310027, China
2School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
3Graduate School of Science, Hokkaido University, Sapporo, 060-0810, Japan
4Oulu Mining School, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 0.5 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe202103248174
|Publish Date:|| 2021-03-24
The genesis of large igneous provinces (LIP) is controlled by multiple factors including anomalous mantle temperatures, the presence of fusible fertile components and volatiles in the mantle source, and the extent of decompression. The lack of a comprehensive examination of all these factors in one specific LIP makes the mantle plume model debatable. Here, we report estimates of the water content in picrites from the Emeishan LIP in southwestern China. Although these picrites display an island arc-like H2O content (up to 3.4 by weight percent), the trace element characteristics do not support a subduction zone setting but point to a hydrous reservoir in the deep mantle. Combining with previous studies, we propose that hydrous and hot plumes occasionally appeared in the Phanerozoic era to produce continental LIPs (e.g., Tarim, Siberian Trap, Karoo). The wide sampling of hydrous reservoirs in the deep mantle by mantle plumes thus indicates that the Earth’s interior is largely hydrated.
|Pages:||1 - 7|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
This study was supported by the Strategic Priority Research Program (B) of Chinese Academy of Sciences (grant no. XDB18000000), the National Natural Science Foundation of China (grant nos. 41630205 and 41772049) and Academy of Finland (grant no. 281859).
|Academy of Finland Grant Number:||
281859 (Academy of Finland Funding decision)
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