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
Crustal accretion in a slow-spreading center of Meso-Tethyan Ocean: Constraints from cumulates in the Dongco ophiolite (Central Tibet)

文献类型：期刊论文

作者Li, Xiao-Ni2,3; Zhang, Wei-Qi2; Liu, Tong2,3; Zhang, Chang2,3; Zhang, Zhen2,3; Lin, Yin-Zheng2,3; Liu, Chuan-Zhou1,2,3
刊名LITHOS
出版日期2023-06-01
卷号446页码:17
关键词Lower oceanic crust Gabbro Dongco ophiolite Bangong-Nujiang Suture Slow-spreading ridge
ISSN号0024-4937
DOI10.1016/j.lithos.2023.107144
英文摘要Lower ocean crustal rocks are important for deciphering magmatic processes in the magma chamber during the generation of the ophiolite. Gabbroic cumulates are volumetrically outcropped in the Dongco ophiolite in the Bangong-Nujiang Suture, which are pervasively intruded by diabase dikes. This study presents mineralogical, geochemical, and geochronological data of the Dongco cumulates to constrain their parental magma compositions and the tectonic setting of the Dongco ophiolite. Zircons and titanites from six gabbros yielded U-Pb ages of 159-166 Ma, suggesting that the Dongco ophiolite was generated during Middle to Late Jurassic. Petrological and major element data of the Dongco cumulates suggest that they were derived from water-poor magmas (similar to 0.5-1.0 wt% H2O) via low-pressure crystallization. Clinopyroxenes of the Dongco cumulates have lower Ti, Zr, and REE but higher Ba abundances compared to those in mid-ocean ridge cumulates. Melts in equilibrium with clinopyroxene of the Dongco cumulates are estimated to compositionally resemble the diabase dikes, both of which share similarities with island arc basalts, e.g., enrichments in Ba, Sr and Pb but depletions in REE and Nb. Moreover, the Dongco cumulates have been inferred to experience rapid exhumation shortly after its emplacement. Therefore, we propose that the Dongco cumulates were generated at a slow-spreading center in a backarc basin. The Dongco ophiolite in the Bangong-Nujiang suture and the Lagkorco ophiolite in the Shiquanhe-Yunzhug-Namco suture share great similarities in their formation ages, spreading rate and tectonic setting, which supports that the western Shiquanhe-Yunzhug-Namco suture is the southward-thrusted nappe of the Bangong-Nujiang suture.
WOS关键词BANGONG-NUJIANG SUTURE ; PHASE-EQUILIBRIA ; U-PB ; GEOCHEMISTRY ; EVOLUTION ; ZONE ; GEOCHRONOLOGY ; WATER ; CLINOPYROXENE ; EXHUMATION
资助项目National Science Fund for Distinguished Young Scholars[2020YFA0714801] ; National Key Research and Development Project of China[XDB42020301] ; Strategic Priority Research Program of the Chinese Academy of Sciences ; [42025201]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:001058602700001
出版者ELSEVIER
资助机构National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/111446]  
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, Chuan-Zhou
作者单位1.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Li, Xiao-Ni,Zhang, Wei-Qi,Liu, Tong,et al. Crustal accretion in a slow-spreading center of Meso-Tethyan Ocean: Constraints from cumulates in the Dongco ophiolite (Central Tibet)[J]. LITHOS,2023,446:17.
APA Li, Xiao-Ni.,Zhang, Wei-Qi.,Liu, Tong.,Zhang, Chang.,Zhang, Zhen.,...&Liu, Chuan-Zhou.(2023).Crustal accretion in a slow-spreading center of Meso-Tethyan Ocean: Constraints from cumulates in the Dongco ophiolite (Central Tibet).LITHOS,446,17.
MLA Li, Xiao-Ni,et al."Crustal accretion in a slow-spreading center of Meso-Tethyan Ocean: Constraints from cumulates in the Dongco ophiolite (Central Tibet)".LITHOS 446(2023):17.

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。