| 李茂田,郑文宝,肖渊甫,邱婵媛,冷秋锋,唐攀,李盛俊.西藏普雄矿区岩浆岩岩石地球化学特征及地质意义[J].矿产勘查,2019,(4):737-748 |
| 西藏普雄矿区岩浆岩岩石地球化学特征及地质意义 |
| Geochemistry Characteristics and Geological Significance of Magmatic Rocks in Puxiong Mining Area, Dazi County, Tibet |
| 投稿时间：2018-07-20 |
| DOI： |
| 中文关键词: 岩石学 岩石地球化学 斑岩—矽卡岩型矿床 冈底斯成矿带 普雄 |
| 英文关键词: petrology, petrogeochemistry, porphyry-skarn type deposit, Gangdise metallogenic belt, Puxiong |
| 基金项目:西南三江有色金属资源基地调查项目(编号:DD20160016-8)资助。 |
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| 中文摘要: |
| 普雄矿区位于西藏冈底斯成矿带东段,毗邻驱龙—甲玛铜多金属矿集区,是该地区近年来新发现的具斑岩—矽卡岩型铜多金属矿潜力矿区。经前期地质勘查工作,已发现数条具工业价值的矽卡岩型铜多金属矿体,矿床规模有望达到中—大型；成矿元素以Cu为主,伴Fe、Au、Pb、Zn。随勘探工作不断深入,成矿体系确定和成矿潜力评价成为勘探工作难点,区内岩浆岩特征研究成为解决这一问题的重点。文章对矿区出露的岩浆岩进行岩石学和地球化学研究,结果表明:区内岩浆岩岩石类型以辉绿玢岩、石英闪长岩及花岗闪长岩为主,属过铝质钙碱性—高钾钙碱性岩石系列。岩浆岩均为轻稀土富集,重稀土亏损,除花岗闪长岩外,其他岩石未见Eu异常。综上:普雄矿区岩浆岩以中基性闪长质I型岩石系列为主,微量和稀土元素特征同典型斑岩—矽卡岩型铜矿类似,具埃达克岩性质；此外,接触带矽卡岩的发现及矿区岩浆混合作用异常发育,都暗示该矿区有望找到斑岩—矽卡岩铜成矿系统。 |
| 英文摘要: |
| The Puxiong mining area is located in the eastern section of the Gangdese metallogenic belt in Tibet, adjacent to the Qulong-Jama copper polymetallic ore concentration area. It is the newly discovered porphyry-skarn type copper polymetallic ore metallogenic potential mining area in recent years. Through the previous geological exploration work, several industrial skarn-type copper polymetallic ore bodies have been discovered, and the scale of the deposit is expected to reach medium-large scale; the ore-forming elements of the deposit are mainly Cu, accompanied by Fe, Au, Pb and Zn. With the deepening of exploration work, the determination of metallogenic system and the evaluation of metallogenic potential have become difficult points in exploration work. The study of magmatic rock characteristics in the area has become the key to solve this problem. Therefore, this paper conducts petrological and geochemical studies on magmatic rocks exposed in the mining area. The results show that the magmatic rock types in the area are mainly diabase, quartz diorite and granodiorite,and belong to the series of alkaline calcium alkaline-high potassium calcium alkaline rock. The magmatic rocks are all enriched by light rare earths, and the heavy rare earths are depleted. Except for the granodiorite, other rocks have no Eu anomalies. In summary:the magmatic rocks in the Puxiong mining area are dominated by the medium-basic dioritic I-type rock series, and the trace and rare earth elements are similar to the typical porphyry-skarn type copper deposits, with Adakite properties; In addition, the discovery of contact skarn and the abnormal development of magma mixing in the mining area suggest that the porphyry-skarn copper mineralization system is expected to be found in the mine. |
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