Zircon U-Pb geochronology, geochemistry and petrogenesis of syenogranite from Angeer Yinwula area in Inner Mongolia

doi:10.3969/j.issn.1673-9736.2019.02.02

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世界地质(英文版) ›› 2019, Vol. 22 ›› Issue (2) : 78-90. DOI: 10.3969/j.issn.1673-9736.2019.02.02

论文

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

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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

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摘要

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.

Abstract

导出引用

LIU Hanlun, WANG Keyong, LI Jian, CAI Wenyan, TANG Wenhao, WANG Changhong. Zircon U-Pb geochronology, geochemistry and petrogenesis of syenogranite from Angeer Yinwula area in Inner Mongolia[J]. 世界地质(英文版). 2019, 22(2): 78-90 https://doi.org/10.3969/j.issn.1673-9736.2019.02.02

LIU Hanlun, WANG Keyong, LI Jian, CAI Wenyan, TANG Wenhao, WANG Changhong. Zircon U-Pb geochronology, geochemistry and petrogenesis of syenogranite from Angeer Yinwula area in Inner Mongolia[J]. Global Geology. 2019, 22(2): 78-90 https://doi.org/10.3969/j.issn.1673-9736.2019.02.02

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