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Geochronology and petrogenesis of the Late Silurian Shitoukengde mafic-ultramafic intrusion, NW China: Implications for the tectonic setting and magmatic Ni-Cu mineralization in the East Kunlun Orogenic Belt
Jia, Lihui1; Mao, Jingwen2; Li, Baolong2; Zhang, Dongyang3; Sun, Tingting4
2020-02-09
Source PublicationINTERNATIONAL GEOLOGY REVIEW
ISSN0020-6814
Pages22
AbstractThe Shitoukengde mafic-ultramafic intrusion, located in the East Kunlun Orogenic Belt, is spatially and temporally associated with the Xiarihamu Ni-Cu sulphide deposit, the second-largest Ni deposit in China. This intrusion comprises mainly lherzolite, harzburgite, olivine websterite, and gabbroic rocks. The Shitoukengde mafic-ultramafic rocks are enriched in light rare earth elements (REE) relative to heavy REE and show pronounced negative Nb-Ta anomalies. Magmatic zircon crystals of the studied samples have high delta O-18 values (6.5 to 8.0 parts per thousand) with a weighted mean value of 7.3 parts per thousand that is higher than the typical mantle value (similar to 5.3 parts per thousand). They are characterized by high epsilon(Hf)(t) values (-2.0 to 9.2) and variable epsilon(Nd)(t) values (-4.46 to 2.83). Olivine grains from the ultramafic rocks have high forsterite (Fo) values of 79.3-86.8 and variable Ni contents of 746-3347 ppm. Our calculations indicate that parental magma of the Shitoukengde intrusion had a high-Mg basaltic composition with 10.9 wt% MgO and 9.8 wt% FeOT. Fractional crystallization and significant crustal contamination triggered S saturation and sulphide enrichment in the magma. Zircon LA-ICPMS and SIMS U-Pb analyses reveal the consistent Silurian ages of 420-424 Ma for the gabbronorite and Ol websterite, which is coeval with the Xiarihamu Ni-Cu deposit. Based on these data and the regional tectonic setting, we suggest that the Shitoukengde mafic-ultramafic rocks formed in the post-collisional, extensional environment. The cessation of subduction may have resulted in break-off of the dense subducted slab, and triggered ascent of the hot convective asthenospheric mantle. The mantle wedge was modified by the subduction-related fluids and these enriched mantle components were incorporated into the ascending asthenospheric melts at relatively shallow depths, generating the high-Mg basaltic magmas that formed the compositionally variable mafic-ultramafic rocks (e.g., Shitoukengde and Xiarihamu intrusions) in the Eastern Kunlun Orogenic belt. [GRAPHICS] .
KeywordZircon U-Pb dating HF-O isotopes petrogenesis Shitoukengde mafic-ultramafic intrusion East Kunlun Orogenic Belt
DOI10.1080/00206814.2020.1722969
Funding OrganizationChina Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences
WOS KeywordNI-CU-(PGE) SULFIDE DEPOSIT ; NORTHERN TIBET PLATEAU ; AFRICAN RIFT SYSTEM ; QAIDAM UHPM BELT ; HF-O ISOTOPES ; U-PB AGE ; ICP-MS ; LU-HF ; NORTHWESTERN CHINA ; SOUTHERN MARGIN
Language英语
Funding ProjectChina Geological Survey[12120114034301] ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences[11990860]
Funding OrganizationChina Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000513119800001
PublisherTAYLOR & FRANCIS INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95661
Collection岩石圈演化国家重点实验室
Corresponding AuthorJia, Lihui; Mao, Jingwen
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China
3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R China
4.Fifth Geol & Explorat Inst Qinghai Prov, Xining, Peoples R China
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
GB/T 7714
Jia, Lihui,Mao, Jingwen,Li, Baolong,et al. Geochronology and petrogenesis of the Late Silurian Shitoukengde mafic-ultramafic intrusion, NW China: Implications for the tectonic setting and magmatic Ni-Cu mineralization in the East Kunlun Orogenic Belt[J]. INTERNATIONAL GEOLOGY REVIEW,2020:22.
APA Jia, Lihui,Mao, Jingwen,Li, Baolong,Zhang, Dongyang,&Sun, Tingting.(2020).Geochronology and petrogenesis of the Late Silurian Shitoukengde mafic-ultramafic intrusion, NW China: Implications for the tectonic setting and magmatic Ni-Cu mineralization in the East Kunlun Orogenic Belt.INTERNATIONAL GEOLOGY REVIEW,22.
MLA Jia, Lihui,et al."Geochronology and petrogenesis of the Late Silurian Shitoukengde mafic-ultramafic intrusion, NW China: Implications for the tectonic setting and magmatic Ni-Cu mineralization in the East Kunlun Orogenic Belt".INTERNATIONAL GEOLOGY REVIEW (2020):22.
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