Sulfur isotopic geochemistry of the Zigangping Pb-Zn deposit, Jiulong County, Sichuan Province
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摘要:
子杠坪中型铅锌矿床地处松潘-甘孜造山带东南缘与扬子地块西缘交界地区。矿体呈似层状、透镜状等产于上二叠统大石包组含石榴斜长黑云石英片岩与含石榴钠长云母片岩夹石英片岩之间的层间带中。矿石矿物主要为闪锌矿、方铅矿、磁黄铁矿。对九龙子杠坪铅锌矿床中方铅矿、磁黄铁矿和闪锌矿，开展了硫同位素地球化学研究。结果表明，24件金属硫化物样品的δ34S值为10.67‰~18.17‰（平均14.79‰），均为正值且较接近，以富集重硫为特征。硫表现出混染硫的特征，以热化学硫酸盐还原作用为主，来自于建造水并有深部热流体的混合特征。
Abstract:The Zigangping Pb-Zn deposit lies on the southeastern margin of the Songpan-Garze orogenic belt and western Yangtze block.The orebodies are layered and lenticular in the interlayer fault zone between the garnet-bearing plagioclase biotite quartz schist and garnet-bearing paragonite schist intercalated with quartz schist.The ore minerals are mainly sphalerite, galena and pyrrhotite.The δ34S analysis was carried out on ore-related sulfides from galena, pyrrhotite and sphalerite.The δ34S values mainly vary between 10.67‰ and 18.17‰ (averaging 14.79‰), and are characterized by enrichment of heavy sulfur and mixed sulfur.The S isotopic data indicate that the sulfur may have experienced thermochemical sulfate reduction, with the characteristics of formation water and deep thermal fluids.
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Key words:
- sulfur isotopes /
- geochemistry /
- Zigangping Pb-Zn deposit /
- Jiulong /
- Zigangping
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表 1 子杠坪铅锌矿床硫同位素组成
Table 1. Sulfur isotope composition ofthe Zigangping Pb-Zn deposit
序号 样号 矿物名称 δ34SCDT/‰ 1 ZGP-1 方铅矿 12.65 2 方铅矿 12.45 3 闪锌矿 13.58 4 磁黄铁矿 15.49 5 ZGP-2 方铅矿 13.00 6 闪锌矿 11.86 7 磁黄铁矿 12.06 8 ZGP-3 方铅矿 16.04 9 闪锌矿 15.77 10 磁黄铁矿 16.36 11 磁黄铁矿 16.25 12 ZGP-4 方铅矿 17.24 13 闪锌矿 17.24 14 磁黄铁矿 18.17 15 ZGP-5 方铅矿 14.66 16 闪锌矿 17.18 17 磁黄铁矿 15.83 18 ZGP-6 方铅矿 14.26 19 闪锌矿 16.77 20 闪锌矿 16.62 21 磁黄铁矿 12.32 22 ZGP-7 方铅矿 13.67 23 闪锌矿 14.84 24 磁黄铁矿 10.67 
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