[an error occurred while processing this directive] | 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 | |||||||||||||||||||||||||||||||||||||||||||||||
LIU Hanlun, WANG Keyong, LI Jian, CAI Wenyan, TANG Wenhao, WANG Changhong | |||||||||||||||||||||||||||||||||||||||||||||||
College of Earth Sciences, Jilin University, Changchun 130061, China | |||||||||||||||||||||||||||||||||||||||||||||||
ժҪ�� 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. | |||||||||||||||||||||||||||||||||||||||||||||||
�ؼ����� syenogranite zircon U-Pb dating geochemistry tectonic setting Angeer Yinwula area Paleo-Pacific Ocean | |||||||||||||||||||||||||||||||||||||||||||||||
Zircon U-Pb geochronology, geochemistry and petrogenesis of syenogranite from Angeer Yinwula area in Inner Mongolia | |||||||||||||||||||||||||||||||||||||||||||||||
LIU Hanlun, WANG Keyong, LI Jian, CAI Wenyan, TANG Wenhao, WANG Changhong | |||||||||||||||||||||||||||||||||||||||||||||||
College of Earth Sciences, Jilin University, Changchun 130061, China | |||||||||||||||||||||||||||||||||||||||||||||||
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. | |||||||||||||||||||||||||||||||||||||||||||||||
Keywords: syenogranite zircon U-Pb dating geochemistry tectonic setting Angeer Yinwula area Paleo-Pacific Ocean | |||||||||||||||||||||||||||||||||||||||||||||||
�ո����� 2018-09-20 ������ 2018-11-15 ����淢������ | |||||||||||||||||||||||||||||||||||||||||||||||
DOI: 10.3969/j.issn.1673-9736.2019.02.02 | |||||||||||||||||||||||||||||||||||||||||||||||
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Supported by Joint Project of Geological Survey of Jilin University and Shandong Gold Group Co., Ltd (No. MJDK2016005). | |||||||||||||||||||||||||||||||||||||||||||||||
ͨѶ����: WANG Keyong | |||||||||||||||||||||||||||||||||||||||||||||||
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����Email: wangky@jlu.edu.cn | |||||||||||||||||||||||||||||||||||||||||||||||
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