| 新疆阿克陶县塔木-卡兰古铅锌矿带矿床地质和硫同位素特征 |
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| 引用本文：.1998.Geology and sulfur isotope geochemistry of the Tamu-Kalangu lead-zinc deposits, Akto County, Xinjiang[J].Mineral Deposits,17(3):204~214 |
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| 基金项目:国家305项目（96-915-06-02-01） |
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| 中文摘要:新疆塔木-卡兰占铅锌矿带位于塔里木板块西南缘之晚占生代碳酸盐台地环境中。矿化以铅锌矿为主，个别矿床含铜。矿床赋存丁．中泥盆统下石炭统三个控矿的占含水层中，矿体形态复杂，富矿段往往赋存于多组断裂构造交汇部位。矿石根据其结构大体可分两类：一类呈角砾状构造，硫化物呈浸染状，共（伴）生赤铁矿和磁铁矿：另一类矿石中硫化物以胶状、草莓状结构为主。硫化物硫同位素值具有较宽的范围，δ34S为-39.2‰~+14‰，主要集中在-29.3‰~17.7‰和-3.6‰~+5.1‰两个区间，分别与上述两类矿石相对应。研究表明，位于泥盆系与石炭系间的第二占含水层是最重要的找矿层位，角砾岩带是重要的找矿评价标志，矿床成因可能属密西西比河谷型（MVT），两种性质差异很大的低温热液混合引起成矿物质的沉淀和成矿。 |
| 中文关键词:铅锌矿床,矿床成因, 硫同位素,新疆塔木-卡兰古 |
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| Geology and sulfur isotope geochemistry of the Tamu-Kalangu lead-zinc deposits, Akto County, Xinjiang |
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| Abstract:Lying in Akto County, Xinjiang, the Tamu-Kalangu lead-zinc belt occurs in Late Proterozoic carbonate platform in the southwestern margin of Tarim plate. Lead-zinc( copper) and iron mineralizations are all found in brecciated zones in three rock sequences from Upper Middle Devonian to Early Carboniferous that consist of sandstone and overlying carbonate rocks and seem to serve as paleoaquifers. Orebodies are complex in shape, and rich orebodies mostly occur at the intersections of different faults. The sparrydolomitiation, mostly 2 mm in size, appears around sulfide minerals. Ore sulfide minerals include galena, sphalertie, some chalcopyrite and minor pyrite. The ores can be divided into two types: one is brecciated in form, and consists of coarse galena, sphalerite, minoreuhedral tyrite, hematite and sparry dolomite that fills brecciapores, whereas in the other type, sulfides are dispersed, and fine-grained pyrite and some sphalerite occur as colloforms and framboids. The δ34S values of ore sulfides are betw een -39.2‰ and +14‰, With most values varying in two ranges. The sulfides in brecciated ores have δ34S values of -3.6‰ ~ + 5.1‰ and relatively low temperature, whereas colloform and framboidal pyrite and other correlated sulfides haveδ34S values of -29.3‰ ~ -17.7‰ and higher temperature. In iron mineralization, euhedral pyrite and correlated hematite have sulfur isotope values of + 13.5‰ ~ 14‰, with fine-grained framboidal pyrite having the value of -39.2‰. Geological and sulfur isotope studies suggest that there existed two end m emberreser voirs for two types of ore fluids in the ore-forming event, and the mixing of the fluids seems to have been most important in mineralization. One type of fluid was reduced fluid containing isotopically light sulfurs (δ34S -10‰) and the other is oxidized fluid containing abundant metals with isotopically high sulfur (δ34S -10‰). It is considered that the middle paleoaquifer between Devonian and Carboniferous is an important position for prospecting, and brecciation is an important indicator of exploration. |
| keywords:Xinjiang, lead-zinc deposit, Mississippi Valley type, suflfur isotope, genesis |
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