Liu, J., Xia, Q. K., Sun, H., Hanski, E., Kuritani, T., Gu, X. Y., & Chen, H. (2022). Compositional variation of picrites in the Emeishan large igneous province modulated by water in the mantle plume. Journal of Geophysical Research: Solid Earth, 127, e2021JB023584. https://doi.org/10.1029/2021JB023584
Compositional variation of picrites in the Emeishan large igneous province modulated by water in a mantle plume
|Author:||Liu, J.1; Xia, Q. K.1; Sun, H.1;|
1Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
2Oulu Mining School, 90014 University of Oulu, Finland
3Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
|Online Access:||PDF Full Text (PDF, 2.5 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2022102563269
John Wiley & Sons,
|Publish Date:|| 2022-10-25
Initiation of large igneous provinces (LIPs) and temporal and spatial variations in their chemical compositions provide unique opportunities to understand mantle dynamics. It has been recently revealed that water-rich reservoirs in the mantle sources have played a significant role in the production of LIPs. However, the dominant causes for the chemical variations in primitive magmas of LIPs remain debated. In the Emeishan LIP (ELIP), there are several places where picrites accompany more abundant flood basalts. These picrites span a large range of Ti/Y, Sm/Yb, and TiO₂/Al₂O₃. In this work, we have determined the water contents of picrites with Ti/Y > 500 from the ELIP, based on the water content of clinopyroxene phenocrysts and water partitioning coefficients. We have also calculated the water content of the mantle sources by applying batch and fractional partial melting models. We show that the chemical compositions of picrites in the ELIP closely correlate with the calculated water content in their mantle sources. Our model suggests that the variation in the chemical composition of the primary magmas of the ELIP both on a local and regional scale can be mainly explained by the complementary roles of relatively dry recycled pyroxenite and hydrated components in the mantle plume, without requiring catastrophic thinning of the lithospheric mantle. Our model thus implies that both the initiation and chemical variation of the ELIP are affected by water from the deep mantle.
Journal of geophysical research. Solid earth
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
This study was supported by the National Natural Science Foundation of China (Grants 41630205, 41772049), Strategic Priority Research Program (B) of Chinese Academy of Sciences (Grant XDB18000000), and Fundamental Research Funds for the Central Universities (Grant K20210168).
The Supporting Data sets for this research are available via the DOI (https://doi.org/10.6084/m9.figshare.14815878).
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