| 花垣铅锌矿床成矿流体特征及动态 |
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| 引用本文： | 刘文均,郑荣才.花垣铅锌矿床成矿流体特征及动态[J].矿床地质,2000,19(2):173-181. |
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| 作者姓名： | 刘文均 郑荣才 |
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| 作者单位： | 成都理工学院,成都 |
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| 基金项目： | 国家自然科学基金!(编号 :49572121) |
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| 摘 要： | 花垣铅锌矿床是近年来发现的产于上寒武统清虚洞组藻灰岩－鲕粒灰岩中的大型密西西比型（ＭＶＴ）铅锌矿床。根据矿床中大量流体包裹体的详细研究，成矿流体为高盐度的低温 水，流体报相组分中，Ｈ２Ｏ占有主要部分，ＣＯ２＋ＣＨ４约为５％，１ｇｆｏ２稳定在－４８．０￣－４９．００之间，ｐＨ为４．３￣５．８，Ｅｈ为－０．０７￣－０．１ｅＶ，此外，流体组分中，钠离子的含量大于甲离子，钙离子大于镁离子，而氯离子大于氟离
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| 关 键 词： | 成矿流体 热卤水 侧向运动 铅锌矿床 |
Characteristics and movement of ore-forming fluids in the Huayuan Lead-Zinc deposit |
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| Liu Wenjun,Zheng Rongcai.Characteristics and movement of ore-forming fluids in the Huayuan Lead-Zinc deposit[J].Mineral Deposits,2000,19(2):173-181. |
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| Authors: | Liu Wenjun Zheng Rongcai |
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| Abstract: | The Huayuan lead-zinc deposit is a large Mississippi Valley type (MVT) ore deposit in Hunan Province, which occurs in the algal-oolitic limestone of Lower Cambrian Qingxudong Formation. The ore-forming fluids are hot brine with higher salinity and lower temperature accroding to detailed studies of some fluid inclusions. H20 is the main component, and CO2 + CH4 makes up some 5% in gas composition of fluid inclusions. lg fO2 is stable (- 48. 0 ~ -49. 0), pH= 4.3~ 5.8, and Eh= - 0. 07~ - 0.10 eV in ore-forming fluids. In addition, the concentration of sodium ions is higher than potassium ions in the fluid, calcium concentration is higher than that of magnerium, and chlorine concentration is higher than that of fluorine. All these are common characteristics of MVT ore deposits, but the Na+/K+ ratios are lower and Ca2+/M g2+ ratios are higher than MVT deposits in USA. The higher content of potassium ions in fluids is partly caused by higher concentration of host rocks of some ore-bodies. Hydrogen and oxygen isotopic com position of fluids proves that the origin of the ore deposit is related to the formation water with the addition of late meteoric water. Plenty of data show that the temperature of fluids and content of CO2, CH4, K+, Na+, Ca2+ decrease from north to south in ore-field, suggesting that the mirgation of ore-forming fluids is from north to south by transverse motion in host rocks, and the same migration may take place in the periphery of the ore-field. |
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| Keywords: | MVT ore deposits ore\|forming fluids hot brine transverse motion Huayuan in Hunan |
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