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Ancient sub-continental lithospheric mantle (SCLM) beneath the eastern part of the Central Asian Orogenic Belt (CAOB): Implications for crust-mantle decoupling

文献类型：期刊论文

作者Zhang, Yan-Long2; Liu, Chuan-Zhou1; Ge, Wen-Chun2; Wu, Fu-Yuan1; Chu, Zhu-Yin1
刊名LITHOS
出版日期2011-10-01
卷号126期号:3-4页码:233-247
关键词Crust-mantle decoupling Mantle xenoliths Sr-Nd-Hf-Os isotopes Potassic basaltic rocks
ISSN号0024-4937
DOI10.1016/j.lithos.2011.07.022
文献子类Article
英文摘要Potassic basaltic lavas erupted during the Cenzoic are widespread in Wudalianchi. Erkeshan and Keluo (WEK) areas, northeast China, and contain abundant mantle xenoliths. Mantle xenoliths in this study are selected from the Keluo potassic lavas, and mainly comprise spinel Iherzolites and harzburgites with minor dunites and wehrlites. Modal metasomatism is evident in some Keluo xenoliths from the presence of phlogopite and rutile. Mineral compositions indicate that the Keluo xenoliths represent mantle residues after variable degrees of melting, i.e., 1-5% for Iherzolites and 3-11% for harzburgites, with subsequent refertilization. Both bulk-rock and clinopyroxene data show enrichment in light rare earth elements (LREE) and some other incompatible elements (e.g. Ba, U). Clinopyroxenes from some of the Keluo xenoliths have radiogenic Sr isotopes, but unradiogenic Nd-Hf isotopes relative to the Cenozoic mantle xenoliths from other localities of the NE China. The Keluo mantle xenoliths have variable Os-187/Os-188 ratios ranging from 0.11458 to 0.13194. Although most Keluo mantle xenoliths have been affected by Re addition, their Os isotope compositions have not been significantly modified. The unradiogenic Os-187/Os-188 ratios of the refractory harzburgites give Re depletion ages (T-RD) of similar to 1.9-2.1 Ga. This suggests that the sub-continental lithospheric mantle (SCLM) beneath the Keluo area was formed during the Paleoproterozoic, which is older than the age of the overlying crust that was mainly formed since the Neoproterozoic. Therefore, the SCLM beneath the Kelou area is temporally decoupled from the overlying crust. It is unlikely that the Cenozoic SCLM beneath the Keluo area was newly accreted from the asthenosphere, in which ancient mantle domains were preserved. We propose that the ancient mantle beneath the Keluo region is extraneous and has been emplaced from other locations. (C) 2011 Elsevier B.V. All rights reserved.
WOS关键词NORTH CHINA CRATON ; SINO-KOREAN CRATON ; U-PB AGES ; OS ISOTOPIC SYSTEMATICS ; POTASSIC VOLCANIC-ROCKS ; OCEANIC UPPER-MANTLE ; RE-OS ; PERIDOTITE XENOLITHS ; NORTHEASTERN CHINA ; NE CHINA
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000296822900008
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; Jilin University(20111038) ; Jilin University(20111038) ; Jilin University(20111038) ; Jilin University(20111038) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; Jilin University(20111038) ; Jilin University(20111038) ; Jilin University(20111038) ; Jilin University(20111038) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; Jilin University(20111038) ; Jilin University(20111038) ; Jilin University(20111038) ; Jilin University(20111038) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; National Natural Science Foundation of China(90814003) ; Jilin University(20111038) ; Jilin University(20111038) ; Jilin University(20111038) ; Jilin University(20111038)
源URL[http://ir.iggcas.ac.cn/handle/132A11/74451]  
专题中国科学院地质与地球物理研究所
通讯作者Liu, Chuan-Zhou
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Jilin Univ, Coll Earth Sci, Changchun 130026, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Yan-Long,Liu, Chuan-Zhou,Ge, Wen-Chun,et al. Ancient sub-continental lithospheric mantle (SCLM) beneath the eastern part of the Central Asian Orogenic Belt (CAOB): Implications for crust-mantle decoupling[J]. LITHOS,2011,126(3-4):233-247.
APA Zhang, Yan-Long,Liu, Chuan-Zhou,Ge, Wen-Chun,Wu, Fu-Yuan,&Chu, Zhu-Yin.(2011).Ancient sub-continental lithospheric mantle (SCLM) beneath the eastern part of the Central Asian Orogenic Belt (CAOB): Implications for crust-mantle decoupling.LITHOS,126(3-4),233-247.
MLA Zhang, Yan-Long,et al."Ancient sub-continental lithospheric mantle (SCLM) beneath the eastern part of the Central Asian Orogenic Belt (CAOB): Implications for crust-mantle decoupling".LITHOS 126.3-4(2011):233-247.

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