板溪锑矿两类石英脉成因及其对找矿的指示意义

林智炜; 吴堑虹; 李欢; 奚小双; 孔华; 唐宇蔷; 刘飚

doi:10.3799/dqkx.2019.207

Volume 45 Issue 5

May 2020

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Lin Zhiwei, Wu Qianhong, Li Huan, Xi Xiaoshuang, Kong Hua, Tang Yuqiang, Liu Biao, 2020. The Genesis of Two Types of Quartz Veins in Banxi Antimony Deposit and Their Prospecting Significance. Earth Science, 45(5): 1503-1516. doi: 10.3799/dqkx.2019.207

Citation:

Lin Zhiwei, Wu Qianhong, Li Huan, Xi Xiaoshuang, Kong Hua, Tang Yuqiang, Liu Biao, 2020. The Genesis of Two Types of Quartz Veins in Banxi Antimony Deposit and Their Prospecting Significance. Earth Science, 45(5): 1503-1516. doi: 10.3799/dqkx.2019.207

Citation:

Lin Zhiwei, Wu Qianhong, Li Huan, Xi Xiaoshuang, Kong Hua, Tang Yuqiang, Liu Biao, 2020. The Genesis of Two Types of Quartz Veins in Banxi Antimony Deposit and Their Prospecting Significance. Earth Science, 45(5): 1503-1516. doi: 10.3799/dqkx.2019.207

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The Genesis of Two Types of Quartz Veins in Banxi Antimony Deposit and Their Prospecting Significance

doi: 10.3799/dqkx.2019.207

Lin Zhiwei^{1, 2, 3
,},
Wu Qianhong^{1, 2, 3
,
,},
Li Huan^{1, 2, 3
,
,},
Xi Xiaoshuang^{1, 2, 3},
Kong Hua^{1, 2, 3},
Tang Yuqiang^{1, 2, 3},
Liu Biao^{1, 2, 3}

1.
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
2.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
3.
Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha 410083, China

Received Date: 2019-08-30
Publish Date: 2020-05-15

Abstract

Abstract

The Banxi antimony deposit is located in the Central Hunan Sb belt,which is a quartz vein type deposit that has been mined for more than 100 years. Like many hydrothermal deposits,the Banxi deposit has many ore-free quartz veins,which are parallel with the ore-bearing quartz veins at a relatively fixed distance. However,the genetic connection between ore-free and ore-bearing veins is not clear. Based on the comparison of the forming age and fluid components of the two types of quartz veins,the genetic relationship between the two types of quartz veins and the possible geological significance of the ore-free quartz veins are discussed. Field observations,examination of fluid inclusions and hydrogen,oxygen,and sulfur isotope analyses reveal that the two types of quartz veins has no interpenetrating relationship,but the ore-free and ore-bearing veins are physically connected. Integrated with regional geological data,it is concluded that the ore-free vein was formed in Yanshanian period,which was consistent with the ore-bearing vein. The ore-free quartz veins contain a small amount of stibnite and pyrite. Sericitization,silicification and other types of wall rock alteration are both developed on the side of the two types of veins. Micro thermometric analyses of fluid inclusion in ore-free quartz veins yield homogenization temperature ranges of 143-266 ℃ and salinities of 1.7%-8.5% NaCl eqv.. While ore-bearing quartz veins inclusions have ranges of 185-332 ℃ with salinities of 3.3%-7.7% NaCl eqv.,showing that both types of veins formed in medium-low temperature and low salinity fluid systems. Laser Raman analyses of a fluid inclusion from both types of veins show that the gas phase components of both fluids are H₂O±CO₂±CH₄±N₂. LA-ICP-MS test results confirm that both types of veins contain the same elements (Sb,Fe,As,etc.),and that their fluid components are very similar. The values of δD and δ¹⁸O_H2O of the ore-free quartz veins vary from -69.7‰ to -74.4‰,and 2.6‰ to 3.4‰,while the values in ore-bearing quartz vein vary from -140‰ to -107‰,and 5.9‰ to 8.4‰. The values of δ³⁴S of sulfide are 3.04‰-4.87‰ (ore-free quartz vein) and 3.46‰-6.12‰ (ore-bearing quartz vein). Previous geologic work and field observations during this study indicate that quartz porphyry veins in the mining area developed without significant magmatic activity. This suggests that the original fluid for both types of veins was metamorphic water,and that the nature of quartz veins changed with time,regional cooling and different levels of meteoric water participation. In both types of veins,sulfur found in sulfides was derived from the host formation. The spatial relationship between the two types of quartz veins and their similar components and sources of ore-forming materials indicate that the two types of quartz veins are close to the same age of formation and belong to the same metallogenic hydrothermal system. The slight difference in geological and geochemical characteristics between the two types of quartz veins is the result of the continuous evolution and differentiation of ore-forming fluids. The study of the genetic relationship between the two types of quartz veins provides an example for the study of the ore-forming fluid mixing of this type of deposit. The distribution characteristics of the two types of quartz veins parallel at a relatively fixed distance not only provide a new mark for prospecting for banxi antimony deposit,but also enlighten us to pay attention to the possible indicating role of ore-free quartz veins in some deposits of this type or in the new exploration area for the ore-bearing quartz veins.
- ore-free quartz vein,
- hydrothermal deposits,
- fluid inclusions,
- fluid components,
- Banxi antimony deposit,
- deposit geology

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References(59)

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