Geochemical Features, Age, and Tectonic Significance of the Kekekete Mafic-ultramafic Rocks, East Kunlun Orogen, China

doi:10.1111/1755-6724.12131

	Geochemical Features, Age, and Tectonic Significance of the Kekekete Mafic-ultramafic Rocks, East Kunlun Orogen, China
	Li Ruibao 1,2; Pei Xianzhi 1,2; Li Zuochen 1,2; Sun Yu 3; Feng Jianyong 1,4; Pei Lei 5; Chen Guochao 1; Liu Chengjun 1; Chen Youxin 1
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2013-10-01
卷号	87 期号:5 页码:1319-1333
关键词	ophiolite tectonic attribute Kekekete East Kunlun Orogeny
ISSN号	1000-9515
DOI	10.1111/1755-6724.12131
文献子类	Article
英文摘要	The Kekekete mafic-ultramafic rocks are exposed in the Kekesha-Kekekete-Dawate area, which are in the eastern part of the East Kunlun Orogenic Belt It outcrops as tectonic slices intruding tectonically in the Paleoproterozoic Baishahe Group and the Paleozoic Nachitai Group. The Kekekete mafic and ultramafic rocks is located near the central fault in East Kunlun and lithologically mainly consists of serpentinite, augite peridotite, and gabbro. The LA-ICP-MS zircon U-Pb age of the gabbro is 501 +/- 7 Ma, indicating that Kekekete mafic-ultramafic rocks formed in the Middle Cambrian. This rock assemblage is relatively poor in SiO2 and (Na2O+K2O) but rich in MgO and SFeO. The chondrite-normalized REE patterns of the gabbro dip slightly to the right; the primitive mantle and MORB-normalized spidergrams of trace elements show enrichment of large-ion lithophile elements (Cs, Rb, Ba, etc.) and no differentiation of high field strength elements. The general dominance of E-MORB features and the geochemical characteristics of OIB suggest that the Kekekete mafic-ultramafic rocks formed in an initial oceanic basin with slightly enriched mantle being featured by varying degrees of mixing of N-MORB depleted mantle and a similar-OIB-type source. From a comprehensive study of the previous data, the author believes that the tectonic history of the East Kunlun region was controlled by a geodynamic system of rifting and extension in the late stages of the Neoproterozoic to early stages of the Early Paleozoic and this formed the paleo-oceanic basin or rift system now represented by the ophiolites along the central fault in East Kunlun, the Kekekete mafic-ultramafic rocks and Delisitan ophiolite.
WOS关键词	U-PB GEOCHRONOLOGY ; ICP-MS ; NW CHINA ; BELT ; ZIRCON ; OPHIOLITE ; QINGHAI ; DIAGRAM ; AREA ; CLASSIFICATION
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000325550700011
资助机构	National Science Foundation of China(41172186 ; National Science Foundation of China(41172186 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(CHD2011TD020 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(CHD2011TD020 ; Commonweal Geological Survey ; Commonweal Geological Survey ; Aluminum Corporation of China ; Aluminum Corporation of China ; Land-Resources Department of Qinghai Province(200801) ; Land-Resources Department of Qinghai Province(200801) ; 40972136 ; 40972136 ; 2013G1271091 ; 2013G1271091 ; 40572121) ; 40572121) ; 2013G1271092) ; 2013G1271092) ; National Science Foundation of China(41172186 ; National Science Foundation of China(41172186 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(CHD2011TD020 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(CHD2011TD020 ; Commonweal Geological Survey ; Commonweal Geological Survey ; Aluminum Corporation of China ; Aluminum Corporation of China ; Land-Resources Department of Qinghai Province(200801) ; Land-Resources Department of Qinghai Province(200801) ; 40972136 ; 40972136 ; 2013G1271091 ; 2013G1271091 ; 40572121) ; 40572121) ; 2013G1271092) ; 2013G1271092) ; National Science Foundation of China(41172186 ; National Science Foundation of China(41172186 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(CHD2011TD020 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(CHD2011TD020 ; Commonweal Geological Survey ; Commonweal Geological Survey ; Aluminum Corporation of China ; Aluminum Corporation of China ; Land-Resources Department of Qinghai Province(200801) ; Land-Resources Department of Qinghai Province(200801) ; 40972136 ; 40972136 ; 2013G1271091 ; 2013G1271091 ; 40572121) ; 40572121) ; 2013G1271092) ; 2013G1271092) ; National Science Foundation of China(41172186 ; National Science Foundation of China(41172186 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(CHD2011TD020 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(CHD2011TD020 ; Commonweal Geological Survey ; Commonweal Geological Survey ; Aluminum Corporation of China ; Aluminum Corporation of China ; Land-Resources Department of Qinghai Province(200801) ; Land-Resources Department of Qinghai Province(200801) ; 40972136 ; 40972136 ; 2013G1271091 ; 2013G1271091 ; 40572121) ; 40572121) ; 2013G1271092) ; 2013G1271092)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/87121]
专题	中国科学院地质与地球物理研究所
通讯作者	Pei Xianzhi
作者单位	1.Minist Educ, Key Lab Western Chinas Mineral Resources & Geol E, Xian 710054, Shaanxi, Peoples R China 2.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Shaanxi, Peoples R China 3.Beijing Res Inst Uranium Geol, Natl Key Lab Remote Sensing Informat & Image Anal, Beijing 100029, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 5.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Li Ruibao,Pei Xianzhi,Li Zuochen,et al. Geochemical Features, Age, and Tectonic Significance of the Kekekete Mafic-ultramafic Rocks, East Kunlun Orogen, China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2013,87(5):1319-1333.
APA	Li Ruibao.,Pei Xianzhi.,Li Zuochen.,Sun Yu.,Feng Jianyong.,...&Chen Youxin.(2013).Geochemical Features, Age, and Tectonic Significance of the Kekekete Mafic-ultramafic Rocks, East Kunlun Orogen, China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,87(5),1319-1333.
MLA	Li Ruibao,et al."Geochemical Features, Age, and Tectonic Significance of the Kekekete Mafic-ultramafic Rocks, East Kunlun Orogen, China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 87.5(2013):1319-1333.