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Acta Geologica Sinica (English Edition), 2020, 94(supp.1): 78 Geochronological and Geochemical Study of Mafic- intermediate Dykes from the Northern West Junggar, NW China: Source, Petrogenesis and Tectonic Implications 1, * 1 1 YIN Jiyuan , CHEN Wen and XIAO Wenjiao Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Citation: Yin et al., 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(supp. 1): 78. DOI: 10.1111/1755-6724.14480 Abstract: Late Silurian-early Devonian mafic--intermediate melting of metasomatized lithospheric mantle in relatively dykes occur in the Xiemisitai mountain of the northern West shallow level (<80 km). They could be possibly triggered by the Junggar. However, their ages, petrogenesis and geodynamic asthenospheric upwelling as a result of the rollback of the process remain to be unraveled. We report firstly in situ zircon U subducted Irtysh-Zaysan oceanic lithosphere. 40 39 –Pb and hornblende Ar- Ar ages, geochemical and in situ zircon Hf isotopic data for the Xiemisitai dykes. The Xiemisitai Key words: mafic-intermediate dyke, slab roll-back, CAOB, dykes give zircon U–Pb ages of 416.7±2.1 Ma and 405.1±2.5 Ma West Junggar 40 39 and hornblende Ar- Ar age of 405.9±4.9 Ma, respectively. They are characterized by high ε values (+11.9 to +15.5), Acknowledgments: This study was supported by the National Hf(t) suggesting a depleted mantle features. The Xiemisitai dykes Key R & D 445 Program of China (2017YFC0601206), the show low Mg (46–59) and low Cr (11.3–197 ppm) and Ni (19.9 Strategic Priority Research Program (B) of the Chinese Academy –102 ppm) abundances indicating that they have experienced of Sciences (XDB18020203), the Opening Foundation of State significant fractional crystallization. These dykes contain Key Laboratory of Continental Dynamics, Northwest University hornblende and biotite and display negative Nb-Ta-Ti anomalies, (17LCD04) and National Science Foundation of China (Grant enrichment of LREEs, LILEs and depletion of HREEs and nos. 41473053, 41573045, 41611530698, 41873060 and HFSEs with high Ba/La ratios, similar with an origin from a 41830216). This is a contribution to IGCP 649. depleted lithospheric mantle metasomatized by subducted slab- About the first anthor and the corresponding author derived fluids. In addition, the Xiemisitai dykes are plotted Yin Jiyuan, male, born in 1983 in Guiyang City, Guizhou within melting trends with little to no garnet (Cpx:Grt=6:1) in Province; doctor; professor of Institute of Geology, Chinese their source. The La/Yb vs. Tb/Yb plot also indicates the Academy of Geological Sciences. He is now interested in the presence of less than 1% residual garnet in the source region for study on petrogeochemistry and isotope geochemistry of granites and dyke, and Low temperature-thermochronology. the Xiemisitai dykes. Therefore, it can be inferred that the Email: yinjiyuan1983@163.com; Mobile phone: +86 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 * Corresponding author. E-mail: yinjiyuan1983@163.com © 2020 Geological Society of China http://www.geojournals.cn/dzxbcn/ch/index.aspx https://onlinelibrary.wiley.com/journal/17556724
Acta Geologica Sinica (English Edition) – Wiley
Published: Oct 1, 2020
Keywords: ; ; ;
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