Fluid inclusions and formation mechanisms of the Dongjianian silver deposit in Lingbao City, Henan Province, China

LIU Chang; ZHANG Can-Hui; ZHANG Xin; ZONG Rui

doi:10.11720/wtyht.2023.1095

2023 Vol. 47, No. 2

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LIU Chang, ZHANG Can-Hui, ZHANG Xin, ZONG Rui. 2023. Fluid inclusions and formation mechanisms of the Dongjianian silver deposit in Lingbao City, Henan Province, China. Geophysical and Geochemical Exploration, 47(2): 343-352. doi: 10.11720/wtyht.2023.1095

Citation:

LIU Chang, ZHANG Can-Hui, ZHANG Xin, ZONG Rui. 2023. Fluid inclusions and formation mechanisms of the Dongjianian silver deposit in Lingbao City, Henan Province, China. Geophysical and Geochemical Exploration, 47(2): 343-352. doi: 10.11720/wtyht.2023.1095

Fluid inclusions and formation mechanisms of the Dongjianian silver deposit in Lingbao City, Henan Province, China

1. Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000, China；
2. No. 2 Institute of Geological and Mineral Survey, Henan Bureau of Geo-exploration & Mineral Development, Zhengzhou 450000, China

Received Date: 02 March 2022

Revised Date: 20 April 2023

Publish Date: 27 April 2023

Abstract

Abstract

The Dongjianian silver deposit, located on the southern margin of the Xiaoqinling Mountains, is controlled by the secondary structures of the Xiaohe fault and is the first large precious metal deposit discovered in the southern belt of the Xiaoqinling Mountains. This deposit has three hydrothermal metallogenic stages, namely the quartz-pyrite metallogenic stage (Ⅰ), the dominant quartz-polymetallic sulfide metallogenic stage (Ⅱ), and the quartz-carbonate metallogenic stage (Ⅲ). Three types of inclusions have primarily developed in the ore bodies, namely gas-liquid two-phase inclusions (W-type), CO2-bearing inclusions (C-type), and pure CO2 inclusions (PC-type). Stage I primarily witnessed the development of C- and W-type inclusions and a small quantity of PC-type inclusions, and stage II mainly saw the development of W-type inclusions and a small amount of C-type inclusions. The quartz fluid inclusions formed in stages I and II have homogenization temperature ranges of 151~270 ℃ and 126~240 ℃, respectively, which exhibits a downward trend. Their salinity varies slightly in the ranges of 3.8%~22.42% NaCleqv and 4.16%~20.48% NaCleqv, respectively, indicating a low-salinity environment. Their CO2 content transformed from enrichment into deficiency. The metallogenic pressure and depth were estimated to be 22.08~76.6 MPa and 3.77~7.13 km, respectively. Therefore, the Dongjianian silver deposit is a low-salinity medium- to low-temperature meso-epithermal silver deposit.
- Dongjianian silver deposit /
- fluid inclusion characteristics /
- hydrothermal deposit /
- Xiaoqinling Mountains /
- Henan

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References

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