西藏波龙斑岩铜金矿床成矿流体物理化学条件

霍艳; 李丹

西藏波龙斑岩铜金矿床成矿流体物理化学条件

霍艳^1,,
李丹²

1.
都理工大学地球科学学院, 成都 610059
2.
河南省岩石矿物测试中心, 郑州 450012

基金项目:

四川省教育厅项目 13ZB0066

成都理工大学中青年骨干教师培养计划资助项目 JXGG201501

成都理工大学"矿物学、岩石学、矿床学"国家重点（培育）学科建设项目 JXGG201SZD0407501

详细信息

作者简介:
霍艳(1978-), 女, 讲师, 理学博士, 主要从事矿床地球化学及区域地质调查等研究工作。E-mail:huoyan@cdut.cn

中图分类号: P618.41
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- 被引次数: 0
出版历程
- 收稿日期: 2015-09-30
- 刊出日期: 2016-06-01

STUDY ON THE FLUID INCLUSION PHYSICOCHEMICAL CONDITIONS OF BOLONG PORPHYRY COPPER-GOLD DEPOSIT IN TIBET

HUO Yan^1
,,
LI Dan²

1.
College of earth sciences, Chengdu University of Technology, Chengdu 610059, Sichuan
2.
Rock and Mineral Testing Center of Henan Province, Zhengzhou 450012, Henan

摘要

摘要: 应用英国Linkam THNSG600型冷热台测试和前人的经验公式，对西藏波龙斑岩铜金矿床在岩浆晚期、磁铁矿-辉钼矿阶段、黄铜矿-黄铁矿阶段和硬石膏-黄铁矿阶段等4个成矿阶段利于主成矿元素Cu迁移的流体包裹体的一般特征及物理化学条件进行研究。研究结果表明，该矿床流体包裹体类型以含石盐和硫化物子矿物的三相包裹体为主，为高温（232~549 ℃）、低压（1.40×10⁵~234.41×10⁵ Pa）、高盐度（NaCl质量分数28.65%~52.16%）、中—高密度（1.0683~1.1598 g/cm³）的流体；随着成矿进程的发展，各阶段流体逸度和活度均逐渐降低，pH值和Eh值逐渐升高，铜主要以Cu（H₂S）（HS）₂-形式存在，说明Cu在高温酸性流体中易成矿。
- 流体包裹体 /
- 物理化学条件 /
- 斑岩铜金矿床 /
- 波龙
Abstract: Using Linkam THNSG600 dating and calculating by experience formulas, this paper discusses the fluid inclusion characteristics of Bolong porthyry copper-gold deposit in Tibet, which is beneficial to the migration of the main ore-forming element Cu, and the metallogenic process includes four periods: magma-advanced stage, magnetite-molybdenite period, chalcopyrite-pyrite period and anhydrite-pyrite period. It shows that the type of fluid inclusion is mainly the three-phases inclusion including NaCl and metal sulfide daughter minerals. The ore-forming fluid forms in high temperature (232~549 ℃) and low pressure (1.40×10⁵~234.41×10⁵ Pa), with high salinity (28.65~52.16wt% NaCl) and middle-high density (1.0683~1.1598 g/cm³). Along with the metallogenic process, the fluid fugacity and activity gradually reduce in each stages, while the values of pH and Eh increase. The element Cu mainly exits in the form of Cu(H₂S)(HS)₂^-, which shows that Cu is easier to mineralization in high tempreture and acidic fluids.
- fluid inclusion /
- physicochemistry conditions /
- porphyry copper-gold deposit /
- Bolong

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图 1 多龙矿集区构造背景简图(a)、地质简图(b)和波龙矿床地质简图(c)^[4]

Figure 1. Tectonic and geological maps of Duolong metallogenic district and geological map of Bolong porphyry Cu-Au deposit

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表 1 波龙铜金矿床流体包裹体均一温度、盐度、密度及压力测定结果

Table 1. Homogenization temperature, salinity, density and pressure of fluid inclusions in Bolong Cu-Au deposit

成矿阶段	主矿物	均一温度/℃		盐度/%		密度/(g·cm^-3)		压力/10⁵Pa
成矿阶段	主矿物	变化范围	平均	变化范围	平均	变化范围	平均	变化范围	平均
岩浆晚期	斑晶石英	334~549	467	38.24~52.16	41.86	1.0683~1.1067	1.0761	58.76~234.41	102.47
磁铁矿-辉钼矿	石英	312~533	429	34.56~50.49	42.34	1.0683~1.0975	1.0771	26.72~212.69	109.59
黄铜矿-黄铁矿	石英	262~502	388	29.47~40.79	35.01	1.0683~1.1494	1.0930	3.14~86.81	33.54
硬石膏-黄铁矿	硬石膏石英	232~471	332	28.65~36.90	32.48	1.0765~1.1598	1.1153	1.40~45.74	17.68

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表 2 波龙铜金矿床流体逸度

Table 2. Fugacity of fluid inclusion in Bolong Cu-Au deposit, Tibet

样号	lgf_O₂	lgf_CO₂	lgf_S₂	阶段
BL002	-27.280	1.851	-3.284	磁铁矿-辉钼矿
BL019	-28.778	1.295	-3.865	黄铜矿-黄铁矿
BL045	-30.167	1.177	-4.323
BL058	-29.946	1.254	-4.227

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表 3 波龙铜金矿床流体pH和Eh值

Table 3. The values of pH and Eh of the fluid inclusions in Bolong Cu-Au deposit, Tibet

样号	pH	Eh	阶段
BL002	5.149	0.009	磁铁矿-辉钼矿
BL019	5.427	0.013	黄铜矿-黄铁矿
BL045	5.486	0.018
BL058	5.448	0.016

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表 4 波龙铜金矿床总硫、总碳活度计算结果

Table 4. Activity of total sulphur and total carbon in Bolong Cu-Au deposit, Tibet

mol/L
样品编号	lgf_S₂	lgf_O₂	lgaH₂S	lga_HS^-	lga_S^2-	lga_HSO₄^-	lga_SO₄^2-	lga_ΣS	a_ΣS	lgf_CO₂	lga_CO₂	lga_H₂CO₃	lga_HCO₃^-	lga_CO₃^2-	lga_∑C	a_ΣC	阶段
BL002	-3.284	-26.714	-0.785	-4.636	-11.587	1.135	-0.596	1.148	14.067	1.851	0.151	0.231	-3.530	-10.811	0.494	3.121	磁铁矿-辉钼矿
BL019	-3.865	-28.152	-0.357	-3.930	-10.603	-1.033	-2.486	-0.271	0.536	1.295	-0.405	-0.325	-3.808	-10.811	-0.062	0.867	黄铜矿-黄铁矿
BL045	-4.323	-29.691	0.184	-3.330	-9.944	-3.512	-4.906	0.184	1.529	1.177	-0.523	-0.443	-3.867	-10.811	-0.180	0.660
BL058	-4.227	-29.513	0.143	-3.409	-10.062	-3.235	-4.667	0.143	1.391	1.254	-0.446	-0.366	-3.829	-10.811	-0.103	0.788

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表 5 铜络离子活度及铜的总溶解度

Table 5. Activity of Cu complex ion and total solubility

样品编号	lga_Cu(HS)^2-	lga_{Cu(H₂S)(HS)^2-}	lga_Cu⁺	lga_CuCl⁰	lga_CuCl₂^-	lga_CuCl₃^2-	lga_Cu²⁺	lga_CuCl⁺	lga_CuCl₂⁰	lga_CuCl₃^-	lga_CuCl₄^2-	lga_ΣCu	阶段
BL002	-6.674	-7.148	-6.428	-14.607	-20.786	-30.765	-13.955	-18.834	-29.214	-40.093	-51.372	-6.183	磁铁矿-辉钼矿
BL019	-5.753	-5.800	-7.065	-21.923	-34.780	-51.438	-15.230	-26.788	-43.845	-61.403	-79.361	-5.464	黄铜矿-黄铁矿
BL045	-4.883	-4.389	-7.509	-12.438	-15.366	-22.095	-16.117	-17.746	-24.875	-32.504	-40.533	-4.268
BL058	-4.983	-4.530	-7.426	-13.964	-18.502	-26.841	-15.951	-19.190	-27.928	-37.167	-46.805	-4.398

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