Rb-Sr isotopic dating and ore-forming fluid characteristics of the Zhongbujie large Pb-Zn deposit, Jiangxi Province
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摘要:
江西众埠街矿床位于钦杭成矿带东段，是近年来取得重大找矿突破的大型铅锌多金属矿床。为研究众埠街矿床成矿作用，对成矿阶段的石英、方解石开展流体包裹体和氢-氧同位素研究，采用闪锌矿Rb-Sr定年方法测定众埠街大型铅锌多金属矿床的成矿时代，通过闪锌矿Sr同位素初始比（87Sr/86Sr）i判断成矿物质来源。测得闪锌矿Rb-Sr等时线年龄为359±7 Ma，表明铅锌成矿期为早石炭世。闪锌矿Sr同位素初始（87Sr/86Sr）i值介于0.6937~0.7163之间，平均值为0.709，表明成矿物质来源于壳幔混合。流体包裹体显微测温结果显示，均一温度范围为154~310℃，盐度范围为0.70%~5.70% NaCleqv。石英氢-氧同位素结果显示，δDⅤ-SMOW值变化范围为-75.4‰~-58.1‰，δ18OH2O值为1.0‰~8.1‰。综合研究表明，成矿流体主要为岩浆水，混合少量的大气降水。众埠街铅锌矿为岩浆热液型矿床，与沉积型锰矿床没有成因联系。
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关键词:
- 众埠街铅锌矿 /
- Rb-Sr同位素测年 /
- 流体包裹体 /
- 氢-氧同位素 /
- 钦杭成矿带
Abstract:Zhongbujie is a large Pb-Zn polymetallic deposit that has achieved major prospecting breakthroughs in recent years, located in the eastern section of the Qinhang metallogenic belt.In order to study the mineralization of the Zhongbujie deposit, this paper carried out fluid inclusions and H-O isotope studies of quartz and calcite in the metallogenic stage.The Rb-Sr isochronous dating method of sphalerites was used to determine the metallogenic age of the Zhongbujie deposit and the study of (87Sr/86Sr) i of sphalerite is used to determine the source of the ore-forming material.The obtained sphalerite isochron age is 359±7 Ma, indicating that the lead-zinc metallogenic period is the Early Carboniferous.The (87Sr/86Sr) i of sphalerite ranges from 0.6937 to 0.7163, with an average value of 0.709, indicating that the ore-forming material of the ore bodies was derived from crust-mantle hybrid.The microscopic temperature results of fluid inclusions show that the homogeneous temperature ranges from 154℃ to 310℃, and the salinity ranges from 0.70% to 5.70% NaCleqv.The results of quartz H-O isotope show that the δDⅤ-SMOW value ranges from -75.4‰ to -58.1‰, and the δ18OH2O value ranges from 1.0‰ to 8.1‰.Comprehensive analysis shows that the ore-forming fluid is mainly magmatic water mixed with a small amount of atmospheric precipitation.The Zhongbujie lead-zinc deposit is a magmatic hydrothermal deposit and has no genetic connection with the sedimentary manganese deposits.
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图 11 众埠街铅锌多金属矿床成矿流体δ18OH2O-δD同位素关系图(底图据Sheppard，1986；Taylor，1997)
Figure 11.
图 12 众埠街铅锌多金属矿床氧同位素组成分布图(底图据Sheppard，1986；郑永飞等，2000)
Figure 12.
表 1 众埠街铅锌多金属矿床原生包裹体显微测温结果
Table 1. Microthermometry data of the fluid inclusions from the Zhongbujie Pb-Zn polymetallic deposit
样品号 寄主矿物 成矿阶段划分 包裹体数量/个 类型 相比/% 完全均一温度/℃ 冰点/℃ 盐度/%NaCl eqv ZK302-969.69 石英 石英-硫化物 9 V+L 10~15 274~322 -3.5~-2.5 4.2~5.7 ZK302-384.6 石英 石英-硫化物 5 V+L 10~15 212~257 -3.0~-1.8 3.1~5.0 ZK301-842.1 石英 石英-硫化物 5 V+L 10~15 198~278 -2.5~-0.8 1.4~4.2 ZK301-604.9 石英 石英-硫化物 4 V+L 10~20 221~289 -2.0~-1.4 2.4~3.4 ZK7001-948.7 方解石 碳酸岩盐 11 V+L 5~15 188~226 -3.4~-1.3 2.2~5.6 ZK7001-889.7 石英 石英-硫化物 5 V+L 10~15 189~221 -2.4~-1.2 2.1~4.0 ZK7001-677.7 石英 石英-硫化物 3 V+L 10 178~191 -2.1~-0.8 1.4~3.5 ZK702-769.7 石英 石英-硫化物 15 V+L 51~70 272~321 -3.7~-2.3 3.9~6.0 ZK702-708.5 石英 石英-硫化物 5 V+L 10~15 234~285 -2.6~-1.5 2.6~4.3 ZK702-667.5 石英 石英-硫化物 5 V+L 10~15 238~277 -2.9~-1.3 2.2~4.8 ZK1101-639 石英 石英-硫化物 5 V+L 5~15 175~204 -2.2~-0.8 1.4~3.7 ZK1101-544.1 石英 石英-硫化物 3 V+L 10~15 205~221 -1.2~-0.5 0.9~2.1 ZK2301-563.5 石英 碳酸盐硫化物 4 V+L 10~15 154~201 -1.4~-0.4 0.7~2.4 ZK2301-752.8 石英 碳酸盐硫化物 3 V+L 10 168~177 -1.5~-0.8 1.4~2.6 
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表 2 众埠街铅锌多金属矿床石英氢-氧同位素组成
Table 2. H-O isotopic analyses of quartz from the Zhongbujie Pb-Zn polymetallic deposit
样品号 矿物 δDⅤ-SMOW/‰ δ18OⅤ-SMOW/‰ δ18OH2O/‰ 温度/℃ ZK302-969.69 石英 -74.1
-75.414.9 8.1 302
302ZK302-384.6 石英 -64.9 12.9 3.4 238 ZK7001-889.7 石英 -58.1 12.6 1.0 202
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表 3 众埠街铅锌多金属矿床闪锌矿Rb-Sr同位素组成
Table 3. Rb-Sr isotopic analyses of sphalerite from the Zhongbujie Pb-Zn polymetallic deposit
样品序号 样品位置 样品名称 Rb/10-6 Sr/10-6 87Rb/86Sr 87Sr/86Sr 2σ ISr 1 ZK302-756.1 闪锌矿 0.4062 0.1277 9.203 0.7407 0.000027 0.6937 2 ZK302-969.69 闪锌矿 0.2437 0.0384 18.5 0.8086 0.00103 0.7141 3 ZK7001-601.5 闪锌矿 0.0337 0.0428 2.27 0.7137 0.00011 0.7021 4 ZK702-688.9 闪锌矿 0.5053 0.2659 5.499 0.7444 0.0018 0.7163 5 ZK301-604.9 闪锌矿 0.9123 3.1140 0.8455 0.7182 0.00004 0.7139 6 ZK2301-590.7 闪锌矿 0.7600 0.7512 2.923 0.7288 0.00009 0.7138
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