| 西藏冈底斯银多金属矿化带的基本特征与成矿远景分析 |
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| 引用本文：.2007.Characteristics and ore potentiality of Gangdese silver_polymetallic mineralization belt in Tibet[J].Mineral Deposits,26(2):153~162 |
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| 基金项目:国家重点基础研究发展规划973项目“印度_亚洲大陆碰撞带成矿作用”（编号2002CB412610） |
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| 中文摘要:在冈底斯斑岩铜矿带的北侧，发育一条与之平行的银多金属矿化带。文章对该银多金属矿化带的成矿构造背景、矿床类型及矿化特点进行了初步分析与总结。研究结果表明，该矿化带受旁多—措勤逆冲系的控制，呈近EW向带状展布，带内矿床多位于EW向逆冲断裂与近NS向张性构造的交汇部位；主要矿化类型为矽卡岩型和热液脉型；据矿化特点差异，以念青唐古拉为界，可分为东、西2段，东段以矽卡岩型Cu_Pb_Zn_Ag矿化为主，西段以热液脉型Ag_Pb_Zn矿化为主，西段矿床的银含量明显高于东段。该矿化带是大陆碰撞造山晚期或后碰撞伸展早期（25～15 Ma）热液活动的产物。综合对比分析显示，该矿化带具有良好的成矿条件及巨大的成矿潜力，有望发展成为一条规模巨大的银多金属成矿带。 |
| 中文关键词:地质学 银多金属矿化带 旁多—措勤逆冲系 成矿潜力 冈底斯 西藏 |
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| Characteristics and ore potentiality of Gangdese silver_polymetallic mineralization belt in Tibet |
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| Abstract:A new silver_polymetallic mineralization belt in parallel with the Gangdese porphyry copper belt was discovered on the northern side of the Gangdese Range. This WE_trending silver_polymetallic mineralization belt is controlled by the Pangduo-Cuoqin thrust system. Most of the deposits in the belt occur at the junctions between the WE_striking thrust faults and the NS_striking tension faults. Two types of mineralization can be recognized in the belt. In the western part, i.e. to the west of Yangbajing rift, the deposits are dominated by hydrothermal veinlike silver-lead-zinc mineralization; in the eastern part, however, the deposits are characterized by skarn type copper_lead_zinc_silver mineralization. The silver content of ores in the western belt is obviously higher than that in the eastern belt. The silver_polymetallic deposits resulted from the hydrothermal process in the late period of the continent collisional orogenic activity or in the early stage of collision_extension (25～15 Ma). An integrated analysis shows that the belt has favorable conditions for silver_polymetallic mineralization and possesses remarkable mineralization potentiality. The belt is therefore expected to develop into a large_size silver_polymetallic belt in Tibet. |
| keywords:geology, silver_polymetallic mineralized belt, Pangduo_Cuoqin thrust system, potentiality of mineralization, Gangdese, Tibet |
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