青海东昆仑鸭子沟多金属矿床地质地球化学特征及找矿前景分析
Geology, Geochemical Characteristics and Prospecting Analysis of Yazigou Polymetallic Deposit, East Kunlun, Qinghai Province
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摘要: 鸭子沟矿床是青海祁漫塔格地区新近发现的铜、钼、铅、锌多金属矿床。笔者基于详细野外地质调查，开展了地质地球化学研究，分析了找矿前景。该矿床产出2种矿化类型：一种为矽卡岩型铜铅锌矿，矿体主要产于印支期二长花岗岩与滩间山群大理岩接触部位的矽卡岩带中；另一种为产于印支期花岗斑岩中的斑岩型铜钼矿。通过对侵入岩岩石地球化学分析，并结合区域地质构造演化分析，表明与矽卡岩型矿化密切相关的花岗闪长岩和二长花岗岩，以及与斑岩型成矿密切相关的钾长花岗斑岩均属弱过铝质的高钾钙碱性花岗岩类，形成于碰撞后构造环境。基于矿区成矿地质条件和地球物理、地球化学特征综合分析，认为该区具有良好的找矿前景。Abstract: Yazigou polymetallic deposit in Qimantage of Qinghai is a newly discovered copper-molybdenum lead-zinc deposit. Based on detailed field survey, this paper studied geological and geochemical characteristics of Yazigou deposit and analyzed its prospecting potential. Two mineralization types have been found, i.e., skarn copper-lead-zinc ore bodies mainly occurred in skarn between the Triassic monzogranite and the marbles of Tanjianshan group, and copper-molybdenum porphyry ore bodies mainly occurred in the Triassic granitic porphyry. Geochemical results and regional tectonic evolution analysis showed that granodiorite and monzogranite closely associated with skarn mineralization and granitic porphyry strongly related to porphyry mineralization are all weakly peraluminous high K calc-alkaline granites that formed in the post-collision tectonic setting. According to metallogenic geological conditions, geophysical and geochemical characteristics of the Yazigou deposit, this area still has favorable exploration prospects.
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Key words:
- polymetallic deposit /
- geology and geochemistry /
- exploration prospects /
- Yazigou deposit /
- Qimantage
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