| 内蒙古白音查干银多金属矿化区地质特征及找矿方向 |
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| 引用本文：.2007.Geological features and prospecting directions of Bayanchagan silver polymetallic mineralized area in Xi Ujmqin Banner, central-eastern Inner Mongolia[J].Mineral Deposits,26(2):213~220 |
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| 基金项目:国家自然科学基金项目（编号：40573025） |
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| 中文摘要:白音查干银多金属矿化区是近两年来在内蒙古中东部找到的一处大型构造_蚀变岩型银_铅_锌矿预查区，大规模找矿勘查和综合性研究工作正在进行中。野外地质调查和钻（坑）探结果表明，在白音查干地区及外围存在有数条长千余米、宽几十米到百余米的银多金属矿化带。钻孔中所见矿化体以厚度大、连续性好和品位高为特征，银含量变化范围为（22.4～2 270）×10-6,平均值为502.68×10-6；最高值为3 775×10-6；铅为0.46%～5.40%，平均值为0.69%，最高值为6.19%；锌1.34%～18.5%，平均值为2.64%，最高值为32.11%。综合性研究结果表明，海西期中酸性岩浆活动为矿化带的形成提供了动力和物质来源，北北西向构造破碎带为成矿物质的堆积提供了空间条件，二叠系泥质粉砂岩为成矿流体的沉淀起到了圈闭作用。根椐上述成矿理论，结合地质和物化探资料数据，认为在白音查干银多金属矿化区及外围实现更大的找矿突破是完全有可能的。 |
| 中文关键词:地质学 银多金属矿化带 构造_岩浆活动 成矿作用构造-蚀变岩 找矿突破 白音查干 内蒙古 |
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| Geological features and prospecting directions of Bayanchagan silver polymetallic mineralized area in Xi Ujmqin Banner, central-eastern Inner Mongolia |
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| Abstract:Located at the northwestern corner of Xi Ujmqin Banner in the central_eastern part of Inner Mongolia, Bayanchagan is a newly_discovered silver polymetallic mineralized area. Large_sized mineralizations occur as veins, veinlets, and disseminated and massive blocks within pelitic siltstone and sandy slate of Lower Permian Dashizhai Formation. Up till now, a number of mineralized zones have been identified, varying from several hundred of meters to more than 1000 m in length and from tens of meters to more than 100 m in width. Four drill holes (ZK_3, ZK_5, ZK_8 and ZK_9) were operated along the mineralization zones, among which the ZK_9 shows the best result. Twenty_one silver polymetallic ore layers have been identified, with a total thickness of 83.27m. In addition, the total thicknesses of ore layers in the ZK_8 hole and ZK_3 hole are 23.79m and 20.9m, respectively. The silver polymetallic layer consists mainly of massive, stockwork and disseminated_veinlet sulfide ores. Metallic minerals include pyrite, galena, sphalerite, chalcopyrite, argentite and native silver. Gangue minerals are quartz, fluorite, calcite and sericite. The silver contents of these drilling samples range from 22.4×10-6 to 2 270×10-6 with an average of 502.68×10-6（up to 3 375×10-6）, lead from 0.46% to 5.40% with an average of 0.69%（up to 6.19%）and zinc from 1.34% to 18.5%, with an average of 2.64%（up to 3211%）. Field observations show tat the Hercynian granitoid magma activity, the NNW_trending fractured zone and the carboniferous siltstone played important roles in the formation of these silver polymetallic mineralized zones in Bayanchagan. All these ore_forming materials, dynamic forces and fluids might have been provided by the Hercynian granitoid magma. Moreover, the accumulation conditions of the ore_forming materials were provided by the NNW_trending fractured zone, carboniferous siltstone and sandy slate. Recent studies, combined with newly_obtained geochemical and geophysical data, indicate that systematic exploration is likely to result in more new discoveries of silver polymetallic zones in Bayanchagan. |
| keywords:geology, silver polymetallic mineralized zone, tectonic_magma activity metallogeny, tectonic_altered rocks, exploration breakthrough, Bayanchagan, Inner Mongolia |
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