Geochronological and geochemical constrains on petrogenesis of the Huangyangshan A-type granite from the East Junggar,Xinjiang, NW China |
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| Authors: | Gaoxue Yang Yongjun Li Hongen Wu Xing Zhong Baokai Yang Cunxing Yan Jing Yan Guohui Si |
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| Affiliation: | 1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Xinjiang Research Center for Mineral Resources, Chinese Academy of Sciences, Urumqi 830011, China;3. Xinjiang Bureau of Geology and Mineral Resources, Xinjiang, Urumqi 830000, China;4. Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China;1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;2. Department of Geology, Saint Mary''s University, Halifax, Nova Scotia B3H 3C3, Canada;3. Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada;1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. 216 Team, China National Nuclear Corporation, Urumqi 830011, China;4. Hunan Institute of Geological Survey, Changsha 410116, China;5. College of Earth Sciences, Guilin University of Technology, Guilin 541004, China;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China;2. University of Chinese Academy of Sciences, 100049 Beijing, China;3. GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, Schlossgarten 5a, 91054 Erlangen, Germany;4. College of Resource and Environment Engineering, Guizhou University, 550025 Guiyang, China;5. School of Geology and Exploration, Xinjiang University, 830046 Urumqi, China;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. College of Earth Sciences, Chang''an University, Xi''an 710054, China;3. Laboratory of Geological Formations, K. Satpaev Institute of Geological Sciences, Almaty 050010, Kazakhstan;1. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. Department of Geology and Planetary Sciences, University of Pittsburgh, Pittsburgh, PA, USA;3. Department of Geology, Northwest University, Xi''an 710069, China |
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| Abstract: | The Huangyangshan pluton occurs in the Kalamaili region which is situated in the central part of the Central Asian Orogenic Belt, East Junggar, Xinjiang (NW China). The granitoid rocks are composed of medium-grained biotite (richterite, arfvedsonite) alkali-feldspar granite, fine grained arfvedsonite alkali-feldspar granite and microgranular enclaves. The granites have a pronounced A-type affinity: they are metaluminous to weakly peraluminous and calc-alkaline to alkaline in composition with high concentrations of Na2O + K2O varying from 8.4 to 9.2 wt.%, high FeOt/MgO and 10,000 Ga/Al ratios, low abundances of CaO, MgO and TiO2, enrichment in some LILEs (such as Rb and Th) and HFSEs (such as Zr, Y and REEs except Eu), depletion in Sr and Ba. Moreover, they display characteristic tetrad REE patterns and non-CHARAC trace element behavior, which is well demonstrated in highly differentiated rocks with strong hydrothermal interaction. The U–Pb zircon LA-ICP-MS ages of the host rocks and enclaves are 311 ± 5 Ma and 300 ± 6 Ma, respectively. The similar of these two ages suggests that host rocks and enclaves formed at a same time. Furthermore, the time span closely corresponds to known ages of post-collisional A-type granitoids of the Junggar terrane. Geochemical, geochronological and isotopic data (εNd(T) in the range +5.2 to +6.6 and ISr mostly in the range 0.7031–0.7041) suggest that the Huangyangshan intrusions, and the enclaves are of mixed origin and are most probably formed by the interaction between the lower crust- and mantle-derived magmas in the Late Carboniferous post-collisional tectonic setting (A2 type granite). The magma for the Huangyangshan granites was derived by partial melting of an enriched subcontinental lithospheric mantle (SCLM) that was modified by slab-derived components from an earlier subduction event, this melting resulted from heat supplied from the asthenosphere through an opening created during the break-off of an oceanic slab. This further proves the important contribution of the Late Paleozoic granitic magmatism in terms of vertical crustal growth in northern Xinjiang. |
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