Zircon U⁃Pb Geochronology, Geochemistry and Sr⁃Nd⁃Hf Isotopes of Diorite in Heishishan Copper Polymetallic Deposit, East Kunlun

被引：2
|
作者：
Li Z. [1 ,2 ]
Li B. [1 ]
Li P. [3 ,4 ]
Sun Y. [1 ]
Shi Y. [1 ]
机构：
[1] College of Earth Sciences, Jilin University, Changchun
[2] Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun
[3] Qinghai First Geological Exploration Institute, Haidong
[4] Deep Exploration Technology Innovation Engineering Technology Center of Large and Super Large Gold Deposits Around Qaidam, Qinghai Province, Haidong
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 12期
关键词：
crust-mantle mixing; diorite; East Kunlun; geochronology; ore deposit; Sr-Nd-Hf isotope; zircon U-Pb dating;
D O I：
10.3799/dqkx.2022.067
中图分类号：
学科分类号：
摘要：
The Heishishan copper polymetallic deposit is located in Wulonggou area, middle part of the East Kunlun orogen belt. The Middle Triassic intrusions in the mining area are very developed, and the diorite produced nearly parallel to the ore bodies provides a good research object for limiting the closure time of the paleo-Tethys ocean in the East Kunlun area. In this article, investigations in terms of zircon U-Pb dating, geochemistry, and Sr-Nd-Hf isotope data were carried out on the Heishishan diorite. Zircon U-Pb dating of the diorite yields magmatic crystallization ages of 241.6±1.0 Ma. The diorite samples contain SiO2= 52.23%-56.19%, K2O+Na2O=3.99%-6.26%, Na2O=2.79%-3.63%, K2O=1.06%-2.71% and MgO=2.55%-4.84%. The diorites are rich in Al, Ca and Fe. Also, they are enriched in light rare earth elements and large ion lithophile elements (Rb, Ba, K), and depleted in heavy rare earth elements and high field strength elements (Nb, Ta, Ti, P). Most samples have obvious negative Eu abnormality (δEu=0.39-0.59). Hf isotopic analysis shows that the zircon εHf(t) values of the diorite are from-4.1 to +0.7. The samples have whole-rock (87Sr/86Sr)t ratios from 0.708 860 to 0.708 960, εNd(t) of-5.0 to-4.9. The comprehensive analysis shows that the Heishishan diorite is of crust-mantle mixing origin. Based on the regional tectonic evolution history, the diorites were formed in a subduction tectonic setting, indicating that the closure of the paleo-Tethys ocean in the East Kunlun area was later than 241.6 Ma. © 2023 China University of Geosciences. All rights reserved.
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页码：4465 / 4480
页数：15
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