中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 岩石圈演化国家重点实验室
Reconsideration of Neo-Tethys Evolution Constrained from the Nature of the Dazhuqu Ophiolitic Mantle, Southern Tibet

文献类型：期刊论文

作者Liu Tong; Wu Fuyuan; Liu Chuanzhou; Zhang Chang; Ji Wenbin; Xu Yang
刊名ACTA GEOLOGICA SINICA-ENGLISH EDITION
出版日期2020-10-01
卷号94页码:36-36
关键词Neo8208 Tethys Ocean sub8208 oceanic mantle Re8208 Os isotope mantle peridotite Dazhuqu ophiolite Yarlung Zangbo suture zone
ISSN号1000-9515
DOI10.1111/1755-6724.14450
英文摘要The nature (i.e., sub-oceanic, sub-arc or sub-continental) of ophiolitic mantle peridotites from the eastern Neo-Tethyan domain in southern Tibet has been hotly debated. This uncertainty limits our understanding of the history and evolution of the eastern Neo-Tethys Ocean. Here we present petrological, geochemical and Re-Os isotopic data for the mantle peridotites from the Dazhuqu ophiolite in the central segment of the Yarlung Zangbo suture zone, southern Tibet. Samples collected include both spinel lherzolites and spinel harzburgites. The lherzolites have spinel Cr-# [Cr/ (Cr + Al), similar to 0.3-0.4] comparable to those of typical abyssal peridotites. In contrast, the harzburgites have spinel Cr-# (similar to 0.3-0.7) overlapping with the ranges of both abyssal and fore-arc peridotites (Day et al., 2017; Parkinson and Pearce, 1998); two samples have spinel Cr-# higher than 0.6, which is probably ascribed to intense melt-rock interactions. Clinopyroxene trace element modeling indicates that the Dazhuqu mantle peridotites have experienced 0-6% garnet-facies melting followed by 10%-18% melting in the spinel stability field. This is similar to the degree of garnet-facies melting inferred for many abyssal peridotites (Hellebrand et al., 2002) and implies deep initial melting (> 85 km), which distinguishes the Dazhuqu mantle peridotites from fore-arc peridotites (commonly <80 km in origin). The Dazhuqu peridotites have unradiogenic Os-187/Os-188 of 0.11836-0.12922, which are commonly lower than the recommended value of primitive upper mantle (PUM) (Meisel et al., 2001). All but one samples yield relatively younger Re depletion ages (T-RD = 0.06-0.81 Ga) with respect to the only one sample having an older T-RD age of 1.66 Ga. Re-Os isotopes and highly siderophile element (HSE) compositions of the Dazhuqu peridotites are similar to those of abyssal peridotites (Day et al., 2017) and the Oman southern massifs (Hangh circle divide j et al., 2010) but are distinct from non-cratonic sub-continental lithospheric mantle (SCLM) xenoliths and sub-arc mantle. We emphasize the similarity between the Dazhuqu and Oman ophiolites, both representing Neo-Tethyan oceanic lithosphere and implying ridge-trench collision.
WOS关键词PERIDOTITES
资助项目National Natural Science Foundation of China[41673038] ; National Natural Science Foundation of China[41521062] ; Key Research Program of Frontier Sciences from CAS[QYZDB-SSW-DQC032] ; Open Fund Project of State Key Laboratory of Lithospheric Evolution[201707]
WOS研究方向Geology
语种英语
WOS记录号WOS:000588213500025
出版者WILEY
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution
源URL[http://ir.iggcas.ac.cn/handle/132A11/98706]  
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Liu Tong
作者单位Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Liu Tong,Wu Fuyuan,Liu Chuanzhou,et al. Reconsideration of Neo-Tethys Evolution Constrained from the Nature of the Dazhuqu Ophiolitic Mantle, Southern Tibet[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2020,94:36-36.
APA Liu Tong,Wu Fuyuan,Liu Chuanzhou,Zhang Chang,Ji Wenbin,&Xu Yang.(2020).Reconsideration of Neo-Tethys Evolution Constrained from the Nature of the Dazhuqu Ophiolitic Mantle, Southern Tibet.ACTA GEOLOGICA SINICA-ENGLISH EDITION,94,36-36.
MLA Liu Tong,et al."Reconsideration of Neo-Tethys Evolution Constrained from the Nature of the Dazhuqu Ophiolitic Mantle, Southern Tibet".ACTA GEOLOGICA SINICA-ENGLISH EDITION 94(2020):36-36.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。