| 内蒙甲生盘铅锌硫矿地质特征及矿床成因 |
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| 引用本文：.1987.Geological Setting And Genesis Of The Jia-Shengpan Pb-Zn-S Ore Belt, Inner Mongolia[J].Mineral Deposits,6(2):40~54 |
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| 中文摘要:甲生盘铅锌硫矿产于中元古界渣尔泰群阿古鲁沟组二岩段顶部白云岩中，共分四个矿段。阿古鲁沟组=、三岩段白云岩及板岩为矿源层。主要矿石矿物为黄铁矿，磁黄铁矿、闪锌矿、方铅矿。有用组分为铅，锌、硫，伴生金、银、镉。据岩相分析和铅，碗、碳、氧同位素和包裹体测试结果分析，该矿床成矿古地理环境为封闭，半封闭的海湾，古气候干燥炎热，蒸发作用强，矿体形成于弱碱性、强还原，盐度较高、有机质丰富的潮坪泻湖及海湾泻湖中。矿床受后期改造微弱。矿床成因类型属沉积弱改造层控矿床。 |
| 中文关键词:铅锌硫矿 矿源层地球化学特征 矿床地质特征 矿床成因内蒙甲生盘 |
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| Geological Setting And Genesis Of The Jia-Shengpan Pb-Zn-S Ore Belt, Inner Mongolia |
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| Abstract:The Jiashengpan Pb-Zn-S deposit is one of the representative deposits along the Langshan- Zhaeitaishan polymetallogenic belt. Geotectonically, the Jiashengpan area is in the western part of northern margin of Inner Mongolia axis within North China platform: The major exposed strata in the ore district are Middle Pioterozoic Zhaertai Group with the Agulugou Formation serving as the ore source bed and the second member of this formation being the ore-hosting horizon. The main economic orebodies occur in carbonaceous argillaceous dolomite and alternating argillaceous- carbonaoeous rocks and carbonate rocks. Lithofacies and paleogeographic studies show that the ore-forming environment is characterized by a quite confined basin, hot and dry climate, relatively high salinity, weak alkalinity, strong reduction, and, in particular, a great abundance of organic carbon. The ore bodies lie in transitional zone between tidal flat gulf lagoon. This paper tries to deal with the genesis of the deposit on the basis of data available in such aspects as geological setting for mineralization, ore-hosting horizon and geology of ore deposit. The ore-bearing formation of the Jiashengpart deposit experienced comparatively weak late-stage geological activities; therefore, the rocks were only subjected to slight metamorphism and the ore concentration was mainly fulfiled in the process of sedimentation-diagenesis. The individual ore bed extends considerably along the strike; orebodies are stable in shape and mode of occurence; mineralization is rather evenly distributed and generally has low grade; the ores show laminated texture and distinct bedding. Ore minerals display extremely fine grains, occur in the disseminated form, and have locally grown larger as a result of recrystalization. The gas-liquid inclusions in minerals are extraordinarily tiny. The lead isotope composition of ore is quite uniform, dominated by single-stage normal lead, with the model age basically consistent with the age of ore-controlling strata; in contrast, δ34S values are scattered. Wall rock alteration is weak, and no obvious relationships are observed between the deposit and the magmatic rocks. Small amounts of ore-forming materials once migrated in ore bed and in overlying or underlying wall rocks, forming small ore veins filled in fissures and causing localized recrystallization. In general, as its original sedimentary characteristics are basically preserved, the deposit should be of sedimentary-weakly transformed stratabound type. |
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