西藏列廷冈-勒青拉铅锌铁铜钼矿床成矿流体特征:来自流体包裹体及碳氢氧同位素的证据

马旺; 刘英超; 杨竹森; 李振清; 赵晓燕; 岳龙龙

doi:10.3799/dqkx.2019.041

Volume 44 Issue 6

Jun. 2019

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Ma Wang, Liu Yingchao, Yang Zhusen, Li Zhenqing, Zhao Xiaoyan, Yue Longlong, 2019. Characteristics of Ore-Forming Fluids of Lietinggang-Leqingla Pb-Zn-Fe-CuMo Polymetallic Deposit in Tibetan: Evidence from Fluid Inclusions and Stable Isotope Compositions. Earth Science, 44(6): 1957-1973. doi: 10.3799/dqkx.2019.041

Citation:

Ma Wang, Liu Yingchao, Yang Zhusen, Li Zhenqing, Zhao Xiaoyan, Yue Longlong, 2019. Characteristics of Ore-Forming Fluids of Lietinggang-Leqingla Pb-Zn-Fe-CuMo Polymetallic Deposit in Tibetan: Evidence from Fluid Inclusions and Stable Isotope Compositions. Earth Science, 44(6): 1957-1973. doi: 10.3799/dqkx.2019.041

Citation:

Ma Wang, Liu Yingchao, Yang Zhusen, Li Zhenqing, Zhao Xiaoyan, Yue Longlong, 2019. Characteristics of Ore-Forming Fluids of Lietinggang-Leqingla Pb-Zn-Fe-CuMo Polymetallic Deposit in Tibetan: Evidence from Fluid Inclusions and Stable Isotope Compositions. Earth Science, 44(6): 1957-1973. doi: 10.3799/dqkx.2019.041

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Characteristics of Ore-Forming Fluids of Lietinggang-Leqingla Pb-Zn-Fe-CuMo Polymetallic Deposit in Tibetan: Evidence from Fluid Inclusions and Stable Isotope Compositions

doi: 10.3799/dqkx.2019.041

1.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2018-09-08
Publish Date: 2019-06-15

Abstract

Abstract

The Lietinggang-Leqingla deposit developed Pb-Zn-Fe-Cu-Mo five kinds of metals in the same ore district, which is the most typical skarn-type deposit in the north Gangdese polymetallic belt.Studying on the ore fluid property is helpful for us to solve the ore-forming mechanism of this deposit, which is considered to be polymetallic symbiosis deposit with different source attributes. In this study, skarn minerals and gangue minerals closely related to Fe-Cu-Mo and Pb-Zn-Cu mineralization were sampled and a detailed study with regard to fluid inclusion and C-H-O isotopes was conducted, the results show that the fluid source and evolution process of the ore blocks are similar. There are mainly liquid-rich fluid inclusions in the sakrn alteration stage, and fluid in this stage has high temperatures and medium -high salinities.There are mainly liquid -rich fluid inclusion and daughter mineral-bearing fluid inclusions in the quartz-sulfide stage and carbonate stage, fluid in the quartz-sulfide stage has medium-high temperature, and salinity can be divided into high salinity and low salinity.Fluid in the carbonate stage has medium-low temperature, and salinity also can be devided into high salinity and low salinity. Studies show that the presence of two fluids with very different salinity results from boiling of the ore-forming fluid. Stable isotope compositions indicate that the ore-forming fluids were derived from magmatic hydrothermal fluid which had undergone degasification in skarn alteration stage and was mixed with meteoric water in quartz sulfide stage and carbonate stage. The δ¹⁸O is obviously depleted in the limestone strata compare with the normal marine limestone, which indicate that the ore-forming fluid had large-scale migration and water-rock interaction in the whole limestone strata of ore district, thus the Pb-Zn-Cu mineralization is formed in the distal skarn belt. This study, combined with previously published data, Fe-Cu and Pb-Zn mineralization of the Lietinggang-Leqingla deposit are the products of magmatic activities in the same period, but they are related to magma of different attributes. Cooling, fluid mixing and variation of pH of ore-forming fluid resulted in the precipitation of metal of the Lietinggang-Leqingla deposit, the mineralization zoning from the Lietinggang-Leqingla deposit was mostly like controlled by the difference of metallogenic temperature and magmatic attribute.
- fluid inclusion,
- hydrogen,
- oxygen and carbon isotopes,
- Pb-Zn-Fe-Cu-Mo polymetallic deposit,
- Lietinggang-Leqingla,
- Tibet,
- deposits

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Characteristics of Ore-Forming Fluids of Lietinggang-Leqingla Pb-Zn-Fe-CuMo Polymetallic Deposit in Tibetan: Evidence from Fluid Inclusions and Stable Isotope Compositions

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