气候变化领域集成服务门户(CCPortal): Tarim Large Igneous Province Caused by a Wide and Wet Mantle Plume

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DOI	10.1029/2019JB019001
	Tarim Large Igneous Province Caused by a Wide and Wet Mantle Plume
	Liu H.; Leng W.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	Large igneous provinces (LIPs) can form by interactions between a hot mantle plume and the lithosphere. The Tarim LIP between ~300 and 280 Ma, located in Northwest China, has been investigated by geochemistry and sedimentology studies. However, the factors controlling Tarim LIP formation and the ancient Tarim plume characteristics remain unclear. Here, a series of 3-D geodynamic models are combined with geological observations to constrain the Tarim LIP evolution and the features of the related Tarim plume. Our results show that (1) an ancient plume produced abundant melts attributed to decompression melting, excess temperature, high water contents, and slow plate motion velocities to form the banded Tarim LIP. (2) The simulated pre-eruption topography coincides with the stratigraphic records from the late Carboniferous to early Permian. Specifically, the swell area of pre-eruption topography is sensitive only to the plume radius and enables us to constrain the ancient mantle plume size well. (3) Based on the volcanic activity and pre-eruption topography, we infer that the ancient Tarim plume had a very large radius of ~200 km, a high excess temperature of ~250 K, and a high water content of ~5 wt.%. (4) Our parameter tests and global plate reconstruction results show that high water contents and slow plate motion velocities facilitate continental flood basalts to form with thick lithosphere. Our geodynamic modeling not only provides new constraints for the Tarim LIP evolution but also first quantificationally demonstrates that water in the mantle plays a key role in continental flood basalt formation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	ancient mantle plume; geodynamic modeling; high water content; Tarim LIP
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187862
作者单位	Laboratory of Seismology and Physics of Earth's Interior; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; CAS Center for Excellence in Comparative Planetology, Hefei, China
推荐引用方式 GB/T 7714	Liu H.,Leng W.. Tarim Large Igneous Province Caused by a Wide and Wet Mantle Plume[J],2020,125(5).
APA	Liu H.,&Leng W..(2020).Tarim Large Igneous Province Caused by a Wide and Wet Mantle Plume.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Liu H.,et al."Tarim Large Igneous Province Caused by a Wide and Wet Mantle Plume".Journal of Geophysical Research: Solid Earth 125.5(2020).