东川播卡Au矿的成矿时代及成矿背景：来自硫化物Re-Os同位素和炭质板岩微量元素证据

刘泽奇; 江小均; 李超; 李文昌; 刘凤祥; 余海军; 王长兵

doi:10.3799/dqkx.2021.178

Volume 46 Issue 12

Dec. 2021

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Article Navigation > Earth Science > 2021 > 46(12): 4260-4273

Liu Zeqi, Jiang Xiaojun, Li Chao, Li Wenchang, Liu Fengxiang, Yu Haijun, Wang Changbing, 2021. Metallogenic Age and Setting of Boka Gold Deposit Dongchuan: Evidence from Re-Os Isotope of Sulfide and Trace Element of Carbonaceous Slate. Earth Science, 46(12): 4260-4273. doi: 10.3799/dqkx.2021.178

Citation:

Liu Zeqi, Jiang Xiaojun, Li Chao, Li Wenchang, Liu Fengxiang, Yu Haijun, Wang Changbing, 2021. Metallogenic Age and Setting of Boka Gold Deposit Dongchuan: Evidence from Re-Os Isotope of Sulfide and Trace Element of Carbonaceous Slate. Earth Science, 46(12): 4260-4273. doi: 10.3799/dqkx.2021.178

Citation:

Liu Zeqi, Jiang Xiaojun, Li Chao, Li Wenchang, Liu Fengxiang, Yu Haijun, Wang Changbing, 2021. Metallogenic Age and Setting of Boka Gold Deposit Dongchuan: Evidence from Re-Os Isotope of Sulfide and Trace Element of Carbonaceous Slate. Earth Science, 46(12): 4260-4273. doi: 10.3799/dqkx.2021.178

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Metallogenic Age and Setting of Boka Gold Deposit Dongchuan: Evidence from Re-Os Isotope of Sulfide and Trace Element of Carbonaceous Slate

doi: 10.3799/dqkx.2021.178

1.
Department of Earth Science, Faculty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
2.
National Geological Experimental Testing Center, Beijing 100037, China
3.
Key Laboratory of Sanjiang Mineralization and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650051, China
4.
Yunnan Nuclear Industry 209 Geological Brigade, Kunming 650032, China

Received Date: 2021-02-16
Publish Date: 2021-12-15

Abstract

Abstract

The Boka gold deposit is located in the middle-south section of "Kangdian axis" in the western margin of Yangtze River. It is quite different from the "Dongchuan type" copper mineralization in the Yinmin-Tangdan area of Dongchuan. The rich wall rock of the deposit is black carbonate clastic rock stratum of Dongchuan group. Au occurs in quartz dolomite sulfide vein. It has obvious alteration characteristics of diabase magma extraction type Au deposit, which is different from ductile shear zone type Au deposit.In this paper, the Au-bearing pyrite and the wall rock carbonaceous slate in the Xinshan-Majiagou ore block were selected for Re-Os isotopic and trace element studies respectively. The results show that the Re-Os isochron age of pyrite is 779±14 Ma (MSWD=11.1), indicating that the Boka gold deposit was formed in Neoproterozoic. The initial Os ratio of pyrite is 3.03±0.42, indicating that the ore-forming materials of Boka gold deposit were mainly derived from the crust (wall rock strata) rather than diabase magma. The contents of Au (402.50×10^-9and 44.98×10^-9on average) and Cu (1 733.00×10^-6 and 46.07×10^-6 on average) in pyrite and carbonaceous slate are much higher than Clark values (about 4×10^-9 and 60×10^-6), which further confirms that the ore-forming materials were derived from the carbonaceous slate of the surrounding rock strata. The diagenetic age of Boka gold deposit in Dongchuan is basically consistent with the Neoproterozoic magmatic rock related hydrothermal transformation events, which indicates that the metallogenic background is the ore-forming response of Neoproterozoic magmatic/hydrothermal transformation in the area. During this period, the magmatic rock is in thermal contact with the ore rich wall rock, and the favorable ore-forming elements were extracted from the wall rock strata, The Boka gold deposit in Dongchuan was formed in a good metallogenic space.
- Boka gold deposit in Dongchuan,
- Re-Os isotope,
- metallogenic age,
- metallogenic dynamics,
- geochemistry

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Metallogenic Age and Setting of Boka Gold Deposit Dongchuan: Evidence from Re-Os Isotope of Sulfide and Trace Element of Carbonaceous Slate

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