Coupling Relation between Magma Mixing and Igneous Petrological Diversity: An Example of Bairiqili Felsic Pluton in East Kunlun Orogen

被引：4
|
作者：
Chen B. [1 ]
Xiong F. [1 ,2 ]
Ma C. [3 ]
Chen Y. [1 ]
Huang H. [2 ]
机构：
[1] College of Earth Sciences, Chengdu University of Technology, Chengdu
[2] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu
[3] School of Earth Sciences, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 06期
关键词：
East Kunlun; Granite; Mafic microgranular enclave; Magma mixing; Petrological diversity;
D O I：
10.3799/dqkx.2020.241
中图分类号：
学科分类号：
摘要：
How crust-mantle magma interaction controls the petrological diversity of the felsic igneous rocks is one of the key scientific issues in petrology research. In this study it takes the Bairiqili felsic pluton which is characterized by its various rock types, as well as its mafic microgranular enclaves (MMEs) in East Kunlun as the research object, and presents its zircon U-Pb chronology, mineralogy, whole-rock geochemistry and Sr-Nd-Hf isotopic data to discuss the key scientific issue. LA-ICPMS zircon U-Pb geochronology indicates that the MMEs (247.8±2.0 Ma), monzogranite (247.5±1.4 Ma), granodiorite (248.8±2.1 Ma) and quartz diorite (248.8±1.5 Ma) all emplaced and crystallized in Early Triassic. Petrographic and mineralogical studies show that the petrogenesis of the felsic rocks and MMEs is closely related to the crust-mantle magma mixing or mingling. Elemental and Sr-Nd-Hf isotopical geochemistry reveals that the mafic magma was originated from partial melting of the enriched mantle which was metasomatized by subduction-related fluid, while the felsic end-member magma was derived from partial melting of the ancient metagreywackes. This study proposes that the mantle-derived mafic magma firstly intruded into the felsic crystal mushy magma chamber, promoting the rejuvenation of this felsic crystal mush. Subsequently, the mixing and mingling interaction occurred between the crust and mantle end-member magmas in different proportions and in different ways, thus formed a variety of igneous rocks including mafic dyke, MMEs, quartz diorite and granodiorite. Crust-mantle magma interaction in crystal mushy state is an important way to control the petrological diversity of felsic rocks and the growth and evolution of continental crust in East Kunlun. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：2057 / 2072
页数：15
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