Origin of the LLSVPs at the base of the mantle is a consequence of plate tectonics - A petrological and geochemical perspective

doi:10.1016/j.gsf.2018.03.005

CORC > 海洋研究所 > 中国科学院海洋研究所

	Origin of the LLSVPs at the base of the mantle is a consequence of plate tectonics - A petrological and geochemical perspective
	Niu, Yaoling 1,2,3,4
刊名	GEOSCIENCE FRONTIERS
	2018-09-01
卷号	9 期号:5 页码:1265-1278
关键词	LLSVPs Subducted ocean crust Subducted mantle lithosphere No superplumes Mantle chemical differentiation Optimal momentum of inertia
ISSN号	1674-9871
DOI	10.1016/j.gsf.2018.03.005
通讯作者	Niu, Yaoling(yaoling.niu@durham.ac.uk)
英文摘要	In studying the petrogenesis of intra-plate ocean island basalts (OIB) associated with hotspots or mantle plumes, we hypothesized that the two large-low-shear-wave-velocity provinces (LLSVPs) at the base of the mantle beneath the Pacific (Jason) and Africa (Tuzo) are piles of subducted ocean crust (SOC) accumulated over Earth's history. This hypothesis was formulated using petrology, geochemistry and mineral physics in the context of plate tectonics and mantle circulation. Because the current debate on the origin of the LLSVPs is limited to the geophysical community and modelling discipline and because it is apparent that such debate cannot be resolved without considering relevant petrological and geochemical information, it is my motivation here to objectively discuss such information in a readily accessible manner with new perspectives in light of most recent discoveries. The hypothesis has the following elements: (1) subduction of the ocean crust of basaltic composition to the lower mantle is irreversible because (2) SOC is denser than the ambience of peridotitic composition under lower mantle conditions in both solid state and liquid form; (3) this understanding differs from the widespread view that OIB come from ancient SOC that returns from the lower mantle by mantle plumes, but is fully consistent with the understanding that OIB is not derived from SOC because SOC is chemically and isotopically too depleted to meet the requirement for any known OIB suite on Earth; (4) SOC is thus the best candidate for the LLSVPs, which are, in turn, the permanent graveyard of SOC; (5) the LLSVPs act as thermal insulators, making core-heating induced mantle diapirs or plumes initiated at their edges, which explains why the large igneous provinces (LIPs) are associated with the edges of the LLSVPs; (6) the antipodal positioning of Jason and Tuzo represents the optimal momentum of inertia, which explains why the LLSVPs are stable in the spinning Earth. (C) 2018, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.
资助项目	National Natural Science Foundation of China[41630968] ; National Natural Science Foundation of China[41130314] ; National Natural Science Foundation of China[91014003] ; National Natural Science Foundation of China-Shandong[U1606401] ; Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; Shandong Province ; City of Qingdao ; Chinese Academy of Sciences[Y42217101L] ; China University of Geosciences (Beijing)
WOS研究方向	Geology
语种	英语
出版者	CHINA UNIV GEOSCIENCES, BEIJING
WOS记录号	WOS:000442691400002
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/159918]
专题	中国科学院海洋研究所
通讯作者	Niu, Yaoling
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 4.China Univ Geosci, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Niu, Yaoling. Origin of the LLSVPs at the base of the mantle is a consequence of plate tectonics - A petrological and geochemical perspective[J]. GEOSCIENCE FRONTIERS,2018,9(5):1265-1278.
APA	Niu, Yaoling.(2018).Origin of the LLSVPs at the base of the mantle is a consequence of plate tectonics - A petrological and geochemical perspective.GEOSCIENCE FRONTIERS,9(5),1265-1278.
MLA	Niu, Yaoling."Origin of the LLSVPs at the base of the mantle is a consequence of plate tectonics - A petrological and geochemical perspective".GEOSCIENCE FRONTIERS 9.5(2018):1265-1278.