气候变化领域集成服务门户(CCPortal): No mafic layer in 80 km thick Tibetan crust

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DOI	10.1038/s41467-021-21420-z
	No mafic layer in 80 km thick Tibetan crust
	Wang G.; Thybo H.; Artemieva I.M.
发表日期	2021
卷号	12 期号:1
英文摘要	All models of the magmatic and plate tectonic processes that create continental crust predict the presence of a mafic lower crust. Earlier proposed crustal doubling in Tibet and the Himalayas by underthrusting of the Indian plate requires the presence of a mafic layer with high seismic P-wave velocity (Vp > 7.0 km/s) above the Moho. Our new seismic data demonstrates that some of the thickest crust on Earth in the middle Lhasa Terrane has exceptionally low velocity (Vp < 6.7 km/s) throughout the whole 80 km thick crust. Observed deep crustal earthquakes throughout the crustal column and thick lithosphere from seismic tomography imply low temperature crust. Therefore, the whole crust must consist of felsic rocks as any mafic layer would have high velocity unless the temperature of the crust were high. Our results form basis for alternative models for the formation of extremely thick juvenile crust with predominantly felsic composition in continental collision zones. © 2021, The Author(s).
语种	英语
scopus关键词	continental collision; felsic rock; Indian plate; lithosphere; lower crust; plate tectonics; seismic tomography; seismic wave; wave velocity; article; earthquake; juvenile; lithosphere; low temperature; tomography; China; Xizang
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251556
作者单位	State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Innovation Academy for Earth Science, CAS, Beijing, China; Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey; Center for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, Norway; State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, China; Department of Geophysics, Stanford University, Stanford, CA, United States; Marine Geodynamics Section, GEOMAR Helmholtz Center for Ocean Research, Kiel, Germany
推荐引用方式 GB/T 7714	Wang G.,Thybo H.,Artemieva I.M.. No mafic layer in 80 km thick Tibetan crust[J],2021,12(1).
APA	Wang G.,Thybo H.,&Artemieva I.M..(2021).No mafic layer in 80 km thick Tibetan crust.Nature Communications,12(1).
MLA	Wang G.,et al."No mafic layer in 80 km thick Tibetan crust".Nature Communications 12.1(2021).