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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Generation of ultraslow-spreading oceanic crust traced by various mafic blocks from ophiolitic melange in the Xigaze Ophiolites, southern Tibet

文献类型：期刊论文

作者Zhang, Chang1,4; Liu, Chuan-Zhou1,2,4; Liu, Tong1,4; Ji, Wen-Bin3; Wu, Fu-Yuan1,2,4
刊名CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
出版日期2023-08-01
卷号178期号:8页码:23
ISSN号0010-7999
关键词Ophiolites Ultraslow-spreading ridges Detachment faults Yarlung-Tsangpo Suture Zone Neo-Tethyan Lithosphere
DOI10.1007/s00410-023-02040-w
英文摘要Construction of oceanic crusts in ultraslow-spreading ridges are controlled by detachment faults, but the specific ways they are determined by detachments remain unclear. Abundant ophiolite massifs discovered along the Yarlung-Tsangpo Suture Zone, southern Tibet, are considered to represent ultraslow-spreading centers of the Cretaceous Neo-Tethys ocean. The presence of various mafic blocks within the ophiolitic melange beneath the lithospheric mantle provides evidence of the entire processes involved in crustal generation. Therefore, in this study geochemical investigations on these mafic blocks from the southern Luqu (Xigaze) ophiolitic melanges were conducted to shed new lights on the petrogenesis of mafic crust rocks in ultraslow-spreading settings. Geochronological results via zircon U-Pb dating gave evidence for their coeval formation to other Yarlung-Tsangpo ophiolitic crust rocks in the Early Cretaceous (ca. 120-130 Ma). Geochemistry and Sr-Nd-Hf isotopes document depleted and primitive characteristics, revealing that these mafic rocks were crystallized from residual melts experienced substantial fractional crystallization following along liquid lines of descent of H2O-poor magmas. However, amphiboles are pervasive throughout our samples, which is in contrast with expectations of clinopyroxene and plagioclase as dominant liquidus phases of anhydrous magma. Textures of replacement of clinopyroxene by magnesio-hornblende and their higher contents of trace elements and Eu negative anomalies support that the amphiboles crystallized during transition from dry magma to hydrous one, indicative of water additions to solidifying melts. Based on the tectonic settings of ultraslow-spreading centers, we proposed a model in which seawater-derived fluids induced through detachment faults could be responsible for the generation of ultraslow-spreading crust.
WOS关键词ZIRCON U-PB ; TEMPERATURE HYDROTHERMAL CIRCULATION ; ZANGBO SUTURE ZONE ; OMAN OPHIOLITE ; ISOTOPIC CONSTRAINTS ; GEOCHEMICAL EVIDENCE ; MANTLE PERIDOTITE ; DETACHMENT FAULTS ; WORKING REFERENCE ; METAMORPHIC SOLE
资助项目National Natural Science Foundation of China[42025201] ; National Natural Science Foundation of China[42272055] ; National Key Research and Development Project of China[2020YFA0714801] ; Key Research Program of the Institute of Geology and Geophysics, CAS[IGGCAS-202202]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者SPRINGER
WOS记录号WOS:001040259400001
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 ; 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 ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation 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 ; National Key Research and Development Project of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation 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 ; National Key Research and Development Project of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation 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 ; National Key Research and Development Project of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/111355]  
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, Chang
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Northwest Univ, Dept Geol, Xian 710079, Shaanxi, Peoples R China
4.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		 Zhang, Chang,Liu, Chuan-Zhou,Liu, Tong,et al. Generation of ultraslow-spreading oceanic crust traced by various mafic blocks from ophiolitic melange in the Xigaze Ophiolites, southern Tibet[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2023,178(8):23.
APA Zhang, Chang,Liu, Chuan-Zhou,Liu, Tong,Ji, Wen-Bin,&Wu, Fu-Yuan.(2023).Generation of ultraslow-spreading oceanic crust traced by various mafic blocks from ophiolitic melange in the Xigaze Ophiolites, southern Tibet.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,178(8),23.
MLA Zhang, Chang,et al."Generation of ultraslow-spreading oceanic crust traced by various mafic blocks from ophiolitic melange in the Xigaze Ophiolites, southern Tibet".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 178.8(2023):23.

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来源：地质与地球物理研究所

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