ORE-FORMING FLUID CHARACTERISTICS AND IMPLICATION OF ANTIMONY DEPOSITS IN CENTRAL JILIN PROVINCE: A Case Study of Datudingzi, Zhilin and Xingfutun Antimony Deposits
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摘要:
吉林中站地区分布着一系列金、锑、铜镍矿床, 成矿地质条件良好.对大秃顶子、幸福屯、植林3个锑矿床辉锑矿主成矿期石英流体包裹体进行显微测温研究和稳定同位素(H、O、S)分析, 结果表明, 流体包裹体主要发育有3种类型: Ⅰ型富液两相(LH2O+VH2O)包裹体, Ⅱ型纯液相(H2O)包裹体, Ⅲ型气相包裹体.包裹体均一温度范围为121.5~281.5℃, 盐度范围为3.39%~10.73%, 估算密度范围为0.833~0.985 g/cm3, 成矿流体为中低温、低盐度、低密度.H-O同位素组成特征显示, δ18O变化范围为15.71‰~18.28‰, δD变化范围为-111.1‰~-83.8‰, 成矿流体主要是岩浆热液, 后期有大气降水加入.黄铁矿的δ34S范围在-8.25‰~-3.86‰, 辉锑矿的δ34S范围在-8.18‰~-7.67‰, δ34S值范围较为集中, 明显区别于岩浆硫, 成矿物质主要来源于地壳.锆石U-Pb测年结果显示, 区内侵入岩的结晶年龄为205±2.7 Ma、192±1.9 Ma、195±1.9 Ma.锑矿床形成与岩浆热液联系密切, 矿床成矿时代为晚三世-早侏罗世.吉林中部锑矿床成因类型为浅成中低温热液型矿床.
Abstract:A series of gold, antimony and copper-nickel deposits are distributed in central Jilin Province with favorable metallogenic geological conditions. The study of microscopic temperature measurement and stable isotopes(H, O and S) for the quartz fluid inclusions in the major metallogenic period of stibnite in Datudingzi, Xingfutun and Zhilin antimony deposits shows that there are three main types of fluid inclusions including Type-Ⅰ of liquid-rich two-phase(LH2O+VH2O) inclusion, Type-Ⅱ of pure liquid phase(H2O) inclusion, and Type-Ⅲ of gas-phase inclusion, with the homogenization temperature of 121.5-281.5℃, salinity of 3.39%-10.73%, and estimated density of 0.833-0.985 g/cm3. The ore-forming fluid is characterized by low-medium temperature, low salinity and low density. The H-O isotopic composition characteristics show that δ18O is 15.71‰-18.28‰, and δD from -111.1‰ to -83.8‰. The ore-forming fluid is dominated by magmatic hydrothermal fluid, mixed with later atmospheric precipitation. The δ34S of pyrite ranges from -8.25‰ to -3.86‰, and that of stibnite from -8.18‰ to -7.67‰. The range of δ34S values is relatively concentrated, obviously different from magmatic sulfur. The metallogenic materials are mainly derived from the crust. The zircon U-Pb dating results reveal that the crystallization ages of the intrusive rocks are 205±2.7 Ma, 192±1.9 Ma and 195±1.9 Ma respectively. The formation of antimony deposit is closely related to magmatic hydrothermal fluid, aged in Late Triassic-Early Jurassic. The antimony deposits in central Jilin Province are of epithermal-mesothermal type genetically.
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Key words:
- antimony deposit /
- fluid inclusion /
- stable isotope /
- metallogenic age /
- genesis of deposit /
- Jilin Province
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表 1 流体包裹体测温及盐度计算结果
Table 1. Temperature measurement and salinity calculation of fluid inclusions
样品号 主矿物 数量 均一温度/℃ 盐度/%，NaCl当量 来源 范围 平均值 范围 平均值 21DTDZ1 石英 6 268.7~281.5 274.80 9.86~10.73 10.38 本文 21DTDZ2 石英 5 268.8~280.0 275.66 8.95~9.73 9.31 本文 21DTDZ3 石英 6 200.5~220.8 211.38 6.16~7.31 6.69 本文 21ZSC-1 石英 10 121.5~191.7 159.42 3.71~6.16 5.00 本文 21ZSC-2 石英 6 158.9~191.5 175.97 3.87~5.26 4.60 本文 21ZSC-3 石英 6 175.1~210.2 196.98 3.39~5.71 4.66 本文 21ZSC-4 石英 10 174.5~195.4 186.82 3.87~6.01 4.97 本文 21XFT1 石英 10 139.8~173.5 159.48 4.96~6.59 5.86 本文 21XFT2 石英 10 133.5~180.6 157.39 5.41~7.73 6.65 本文 21ED-4 石英 8 247.3~268.6 259.4 5.71~7.02 6.37 未发表数据 21ED-8 石英 7 248.9~277.6 262.4 6.30~7.45 6.92 未发表数据 21ED-9 石英 10 238.5~270.1 257.1 6.16~7.45 6.79 未发表数据 
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表 2 锑矿床石英氢氧同位素组成
Table 2. Hydrogen and oxygen isotopic compositions of antimony deposits
样品号 δ18OSMOW/‰ δDOSMOW/‰ δOH2O/‰ 温度/℃ 来源 21DTDZ-1 16.04 -87.0 7.86 217 本文 21DTDZ-2 16.17 -88.5 7.99 217 本文 DTDZ-10H 15.71 -111.1 7.53 217 本文 ZSC-20H 18.28 -104.3 10.10 217 本文 ZSC-10H 17.61 -106.2 9.42 217 本文 21XFT-1 18.11 -86.2 9.93 217 本文 21XFT-2 17.75 -83.8 9.57 217 本文 21EDDZ-2 13.2 -94.0 5.04 217 未发表数据 21EDDZ-1 13.1 -95.5 4.96 217 未发表数据
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表 3 锑矿床硫同位素组成
Table 3. Sulfur isotopic compositions of antimony deposit
样品号 测试矿物 δ34SV-CDT/‰ 来源 21DTDZ-1 黄铁矿 -3.86 本文 21DTDZ-2 黄铁矿 -4.21 本文 21DTDZ-3 辉锑矿 -7.67 本文 21DTDZ-4 辉锑矿 -7.76 本文 DTDZ-LE 黄铁矿 -5.41 本文 DTDZ-10H 黄铁矿 -5.34 本文 ZSC-20H 黄铁矿 -8.03 本文 ZSC-10H 黄铁矿 -8.25 本文 21XFT-3 辉锑矿 -8.18 本文 21XFT-4 辉锑矿 -7.90 本文 21EDDZ-1 黄铁矿 -2.69 未发表数据
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