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Global Geology 2019, 22(2) 78-90 DOI:
10.3969/j.issn.1673-9736.2019.02.02 ISSN: 1673-9736 CN: 22-1371/P |
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Zircon U-Pb geochronology, geochemistry and petrogenesis of syenogranite from Angeer Yinwula area in Inner Mongolia |
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LIU Hanlun, WANG Keyong, LI Jian, CAI Wenyan, TANG Wenhao, WANG Changhong |
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College of Earth Sciences, Jilin University, Changchun 130061, China |
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Abstract��
The study presents the results of U-Pb dating of zircons and whole-rock geochemical analyses of syenogranite in Angeer Yinwula area, China, with the aim of determining its formation time, petrogenesis and regional setting. Zircon U-Pb data obtained by LA-ICP-MS indicate that the syenogranite formed in the Early Cretaceous (136.1±0.9 Ma). Geochemically, the rock is characterized by high SiO2 (76.63%-77.58%) and Na2O+K2O (8.00%-8.32%), low MgO (0.02%-0.04%) and TFe2O3 (0.51%-0.84%), and is enriched in LREEs and LILEs, depleted in HREEs and HFSEs. It belongs to high-K calc-alkaline, metaluminous-weakly peraluminous, exhibiting an affinity to I-type granite. All these characteristics implied that the syenogranite in this region derived from crust-mantle mixed source. Overall, the regional geology, geochronology and geochemical features suggest that the formation of the syenogranite was related to the subduction of the Paleo-Pacific Ocean. |
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Keywords��
syenogranite
zircon U-Pb dating
geochemistry
tectonic setting
Angeer Yinwula area
Paleo-Pacific Ocean
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Received 2018-09-20 Revised 2018-11-15 Online: |
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DOI: 10.3969/j.issn.1673-9736.2019.02.02 |
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Fund:Supported by Joint Project of Geological Survey of Jilin University and Shandong Gold Group Co., Ltd (No. MJDK2016005). |
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Corresponding Authors: |
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Email: wangky@jlu.edu.cn |
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About author: |
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