Buoyant units on oceanic crust and their contributions to components of ophiolitic melanges in orogenic belts

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Buoyant units on oceanic crust and their contributions to components of ophiolitic melanges in orogenic belts
	Zhang JiEn 1; Chen YiChao 2; Xiao WenJiao 1,3; Chen ZhenYu 1,2; Song ShuaiHua 1,2
刊名	ACTA PETROLOGICA SINICA
	2018
卷号	34 期号:7 页码:1977-1990
关键词	Ophiolitic melange Convex topography Basalt Chert Orogenic belt
ISSN号	1000-0569
英文摘要	Ophiolitic melange presents the relict of oceanic crust or other ocean-related tectonic settings. Recent studies show that many exposures onland only crop out part of ophiolitic suite, such as pelagic sediment (Layer 1) and basalt or greenstone (Layer 2), which dominantly bears MORB and OIB geochemical characteristics, not SSZ features. Bathymetric survey shows that there widely develops convex topography of buoyant units in the middle oceanic ridge and seamount/oceanic plateaus on the oceanic crust, which is contrast with previous models suggesting that the surface of oceanic crust is flat and smooth. Based on mechanical behavior of rocks, we analysis the fracture processes of buoyant units with convex topography underthrusting into subduction channel, and suggest that their upper parts are easier to be detached and juxtaposed into orogenic belts, which can be proved by outcropping of components of basalt and chert from Mayile accretionary complex, Western Junggar (NW China) and accretionary complexes in Japan and California Coast Ranges, U. S. A. The formation and emplacement ages of accreted basalt and chert (ophiolites) can be different as tens or more than one hundred million years. These relict oceanic materials generally older than their host trench sediments.
WOS关键词	COAST RANGE OPHIOLITE ; ACCRETIONARY COMPLEX ; WESTERN JUNGGAR ; SUBDUCTION ; CALIFORNIA ; STRATIGRAPHY ; TECTONICS ; HISTORY ; MANTLE ; MIDDLE
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000451724300010
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/89626]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Zhang JiEn
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
推荐引用方式 GB/T 7714	Zhang JiEn,Chen YiChao,Xiao WenJiao,et al. Buoyant units on oceanic crust and their contributions to components of ophiolitic melanges in orogenic belts[J]. ACTA PETROLOGICA SINICA,2018,34(7):1977-1990.
APA	Zhang JiEn,Chen YiChao,Xiao WenJiao,Chen ZhenYu,&Song ShuaiHua.(2018).Buoyant units on oceanic crust and their contributions to components of ophiolitic melanges in orogenic belts.ACTA PETROLOGICA SINICA,34(7),1977-1990.
MLA	Zhang JiEn,et al."Buoyant units on oceanic crust and their contributions to components of ophiolitic melanges in orogenic belts".ACTA PETROLOGICA SINICA 34.7(2018):1977-1990.