The Petrogenesis of Late Carboniferous Monzogranite in Mianduhe Area, Northern Great Xing’an Range: Evidence from Zircon U-Pb Ages, Hf Isotopic and Geochemical Features

被引：0
|
作者：
Xu F. [1 ]
Sun W. [1 ]
Wu D. [1 ]
Wang K. [1 ]
Zhou Y. [1 ]
机构：
[1] Shenyang Center of China Geological Survey, Shenyang
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2022年 / 47卷 / 08期
关键词：
geochemistry; Hf isotope; monzogranite; petrogenesis; tectonic setting; zircon U-Pb chronology;
D O I：
10.3799/dqkx.2021.162
中图分类号：
学科分类号：
摘要：
To determine the petrogenesis and tectonic setting of the Late Carboniferous monzogranite in the northern Great Xing'an Range, (Method) the paper analyzes the zircon U - Pb geochronology, Hf isotope and geochemistry of the monzogranite samples from Mianduhe area. The zircon U - Pb dating results show that the monzongranite was formed at 307 - 308 Ma, belonging to theLate Carboniferous. The characteristics of major elements reveal thatthe granite is characterized by alkali - rich(total alkali= 7.28% - 9.08%), high potassium (K2O=3.45% - 5.54%) and weak peraluminous (A/CNK=1.02 - 1.19), suggesting that it can be classified as high potassium calc - alkaline I - type granite. The characteristics of trace elements reveal thatthe granite has medium - negative Eu anomaly(δEu=0.29 - 0.77), obviously enriched LILES (Rb, K, Th and U) and LREE, significantly depleted HFSEs (Ti, Ta and Nb) and P. In addition, the Hf isotope characteristics show that the εHf(t) values range from +7.73 to +12.46, with the tDM2 age of 501-764 Ma,indicating that their parent magma was formed by partial melting of the Neoproterozoic juvenile lower crust under the amphibolite facies, and then experienced significant fraction crystallization. Combined with previous study, it is suggested that the Mianduhe monzogranite was responded for the collage of the Erguna-Xing’an block and the Songnen block in an post-collision setting during the Late Carboniferous. © 2022 China University of Geosciences. All rights reserved.
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页码：2839 / 2855
页数：16
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