内蒙浩尧尔忽洞金矿流体包裹体和矿床成因研究

王得权; 王建国; 王义忠; 刘建朝; 张海东

内蒙浩尧尔忽洞金矿流体包裹体和矿床成因研究

1.
中陕核工业集团公司, 西安 710054;
2.
长安大学地球科学与资源学院, 西安 710054

基金项目:

国家自然科学基金项目 41040020

中陕核工业集团公司科技创新项目"黄泥坪、秋树坪地区金成矿规律与成矿预测研究 61150101

详细信息

作者简介:
王得权(1981-),男,汉族,陕西省西安市人,博士,现从事固体矿产勘查工作。E-mail:wdq0013@163.com

中图分类号: P597+.3
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出版历程
- 收稿日期: 2015-04-07
- 刊出日期: 2015-04-01

STUDY ON FLUID INCLUSIONS AND GENETIC TYPE OF HAOYAOERHUDONG GOLD DEPOSIT, INNER MONGOLIA

1.
SINO Shaanxi Nuclear Industry Group, Xi'an 710054, China;
2.
School of Earth Science and Resources of Chang'an University, Xi'an 710054, China

摘要

摘要: 内蒙浩尧尔忽洞金矿中比鲁特岩组一、二岩性段是主要的赋矿层位,岩石类型有炭质变粉砂岩、粉砂质板岩、炭质板岩和千枚岩等。该组中Au含量是地壳丰度值的7.14倍,且碳含量较高,介于1%~7%之间。矿化过程分为4个阶段:早期石英脉阶段包裹体均一温度245.2~323.3℃,石英-黄铁矿阶段均一温度为236.9~317.5℃,石英-多金属硫化物阶段均一温度231.7~324.5℃,石英-碳酸盐阶段均一温度187.6~312.9℃。激光拉曼显微探针分析结果显示,气液两相包裹体中液相成分主要为H₂O,含少量CO₂;气相成分主要为CO₂,含少量的CH₄和N₂。氢、氧同位素特征表明成矿流体与岩浆热液关系密切。气相成分中大量有机成分可能是岩浆上侵促使地层中有机质发生热降解而生成的。矿床类型属于黑色岩系型金矿,与中亚成矿带的黑色岩系型金矿具有很高的可比性。
- 比鲁特组 /
- 流体包裹体 /
- 拉曼显微探针 /
- 黑色岩系型金矿
Abstract: The first and second members of Bilute formation are the major ore-bearing horizons in Haoyaoerhudong gold deposit. The rock types contain carbonaceous meta-siltstone, silty slate, carbonaceous slate and phyllite, etc. Au content is 7.14 times of the crustal abundance in the formation and the carbon content is higher, with values of 1% to 7%. The metallogenic process can be divided into four stages:The homogenization temperature of fluid inclusions in the early quartz vein stage and the quartz-pyrite stage are from 245.2 to 323.3℃ and from 236.9 to 317.5℃ respectively; And the homogenization temperature are between 231.7 and 324.5℃ in the quartz-polymetallic sulfide stage and between 187.6 and 312.9℃ in the quartz-carbonate stage. According to the results of laser raman microprobe, The main liquid phase composition are H₂O with minor amounts of CO₂ and the main gas phase composition are CO₂ with minor amounts of CH₄ and N₂ in fluid inclusions. Hydrogen and oxygen isotopic features indicate that the ore-forming fluid is closely related to magmatic hydrothermal. A large number of organic compounds in the gas phase composition may be generated in the thermal degradation of organic matter prompted by the magma invasion. The deposit type belongs to the black rock-hosted gold, with a high comparability of that in central Asian metallogenic belt.
- Bilute formation /
- fluid inclusion /
- Raman microprobe /
- black rock-hosted gold

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图 1 浩尧尔忽洞金矿矿区地质图

Figure 1. Generalized geologic map of the Haoyaoerhudong Gold Deposit

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图 2 浩尧尔忽洞金矿矿体分布

Figure 2. Ore body distribution of Haoyaoerhudong gold deposit

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图 3 浩尧尔忽洞金矿矿石特征

a—矿石含揉皱状石英脉矿石;b—矿石含黄铁矿脉;c—它形方铅矿､黄铁矿(光片);d—炭质板岩(光片);e—石榴子石片岩(薄片);f—绢云母红柱石片岩(薄片)

Figure 3. The characteristics of ore in Haoyaoerhudong gold deposit

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图 4 包裹体显微照片

a—纯液相包裹体；b—纯气相包裹体；c—CO₂三相包裹体；d—长条状气液两相包裹体；e—近椭圆形气液两相包裹体；f—弯月形气液两相包裹体

Figure 4. The microscope photos of fluid inclusion

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图 5 浩尧尔忽洞金矿流体包裹体激光拉曼图谱

Figure 5. Laser Raman spectra of fluid inclusions of Haoyaoerhudong gold deposit

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表 1 浩尧尔忽洞金矿流体包裹体显微测温结果

Table 1. Microthemometric data of fluid inclusions of Haoyaoerhudong gold deposit

样品编号	寄主矿物	数量	均一温度/℃	冰点/℃	盐度/%	流体密度/(g·cm^-3)	成矿阶段
hr007-3	石英	18	245.2～323.3	-5.8～-9.2	10.58～16.59	0.78～0.92	早期石英脉阶段
hr007-5	石英	12	236.9～317.5	-7.6～-11.2	14.00～21.29	0.84～0.91	石英-黄铁矿阶段
hr007-4	石英	21	231.7～324.5	-5.8～-8.7	10.58～15.80	0.75～0.93	石英-硫化物阶段
hr007-13	石英	24	187.6～312.9	-3.9～-7.5	7.04～13.84	0.79～0.97	石英-方解石阶段

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