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Geochronological and Geochemical Study of Mafic-intermediate Dykes from the Northern West Junggar, NW China: Source, Petrogenesis and Tectonic Implications

文献类型：期刊论文

作者YIN, Jiyuan2; CHEN, Wen2; XIAO, Wenjiao2
刊名ACTA GEOLOGICA SINICA-ENGLISH EDITION
出版日期2020-10-01
卷号94页码:78-78
关键词mafic-intermediate dyke slab roll-back CAOB West Junggar
ISSN号1000-9515
DOI10.1111/1755-6724.14480
英文摘要Late Silurian-early Devonian mafic-intermediate dykes occur in the Xiemisitai mountain of the northern West Junggar. However, their ages, petrogenesis and geodynamic process remain to be unraveled. We report firstly in situ zircon U-Pb and hornblende Ar-40-Ar-39 ages, geochemical and in situ zircon Hf isotopic data for the Xiemisitai dykes. The Xiemisitai dykes give zircon U-Pb ages of 416.7 +/- 2.1 Ma and 405.1 +/- 2.5 Ma and hornblende(40)Ar-Ar-39 age of 405.9 +/- 4.9 Ma, respectively. They are characterized by high SMALL ELEMENT OF(Hf(t))values (+11.9 to +15.5), suggesting a depleted mantle features. The Xiemisitai dykes show low Mg-# (46-59) and low Cr (11.3-197 ppm) and Ni (19.9-102 ppm) abundances indicating that they have experienced significant fractional crystallization. These dykes contain hornblende and biotite and display negative Nb-Ta-Ti anomalies, enrichment of LREEs, LILEs and depletion of HREEs and HFSEs with high Ba/La ratios, similar with an origin from a depleted lithospheric mantle metasomatized by subducted slab-derived fluids. In addition, the Xiemisitai dykes are plotted within melting trends with little to no garnet (Cpx:Grt=6:1) in their source. The La/Yb vs. Tb/Yb plot also indicates the presence of less than 1% residual garnet in the source region for the Xiemisitai dykes. Therefore, it can be inferred that the Xiemisitai dykes were generated at a correspondingly shallow depth, mostly within the spinel stability field. Finally, the Xiemisitai dykes were most probably generated by partial melting of metasomatized lithospheric mantle in relatively shallow level (<80 km). They could be possibly triggered by the asthenospheric upwelling as a result of the rollback of the subducted Irtysh-Zaysan oceanic lithosphere.
资助项目National Key R&D 445 Program of China[2017YFC0601206] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18020203] ; Opening Foundation of State Key Laboratory of Continental Dynamics, Northwest University[17LCD04] ; National Science Foundation of China[41473053] ; National Science Foundation of China[41573045] ; National Science Foundation of China[41611530698] ; National Science Foundation of China[41873060] ; National Science Foundation of China[41830216]
WOS研究方向Geology
语种英语
WOS记录号WOS:000588213500049
出版者WILEY
资助机构National Key R&D 445 Program of China ; National Key R&D 445 Program of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Opening Foundation of State Key Laboratory of Continental Dynamics, Northwest University ; Opening Foundation of State Key Laboratory of Continental Dynamics, Northwest University ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D 445 Program of China ; National Key R&D 445 Program of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Opening Foundation of State Key Laboratory of Continental Dynamics, Northwest University ; Opening Foundation of State Key Laboratory of Continental Dynamics, Northwest University ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D 445 Program of China ; National Key R&D 445 Program of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Opening Foundation of State Key Laboratory of Continental Dynamics, Northwest University ; Opening Foundation of State Key Laboratory of Continental Dynamics, Northwest University ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D 445 Program of China ; National Key R&D 445 Program of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Opening Foundation of State Key Laboratory of Continental Dynamics, Northwest University ; Opening Foundation of State Key Laboratory of Continental Dynamics, Northwest University ; National Science Foundation of China ; National Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/98703]  
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YIN, Jiyuan
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, Minist Nat Resources, Key Lab Deep Earth Dynam, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 YIN, Jiyuan,CHEN, Wen,XIAO, Wenjiao. Geochronological and Geochemical Study of Mafic-intermediate Dykes from the Northern West Junggar, NW China: Source, Petrogenesis and Tectonic Implications[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2020,94:78-78.
APA YIN, Jiyuan,CHEN, Wen,&XIAO, Wenjiao.(2020).Geochronological and Geochemical Study of Mafic-intermediate Dykes from the Northern West Junggar, NW China: Source, Petrogenesis and Tectonic Implications.ACTA GEOLOGICA SINICA-ENGLISH EDITION,94,78-78.
MLA YIN, Jiyuan,et al."Geochronological and Geochemical Study of Mafic-intermediate Dykes from the Northern West Junggar, NW China: Source, Petrogenesis and Tectonic Implications".ACTA GEOLOGICA SINICA-ENGLISH EDITION 94(2020):78-78.

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来源：地质与地球物理研究所

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