| 谷子成,龙灵利,王玉往,祝新友,李顺庭,王新雨,童海奎,马财,代岩.东昆仑那更康切尔沟银多金属矿床晚二叠世流纹斑岩年代学和地球化学特征研究[J].矿产勘查,2021,12(4):919-933 |
| 东昆仑那更康切尔沟银多金属矿床晚二叠世流纹斑岩年代学和地球化学特征研究 |
| Geochronology and geochemistry of the Late Permian rhyolite porphyry in the Nagengkangqieergou Ag-polymetallic deposit, East Kunlun Orogen, NW China |
| 投稿时间：2021-01-14 |
| DOI： |
| 中文关键词: 东昆仑 那更 锆石 U-Pb年代学 地球化学 热液脉型矿床 斑岩型矿床中图分类号: P581 文献标识码: A 文章编号: 1674-7801(2021)04-0919-15 |
| 英文关键词: east Kunlun Orogen Nageng U-Pb geochronology geochemistry hydrothermal vein deposit porphyry deposit |
| 基金项目:青海省省财政资金地质项目(编号:2019048001ky001)资助。 |
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| 中文摘要: |
| 位于东昆仑造山带的那更康切尔沟银多金属矿床是近年来发现的一大型热液脉型矿床。本文研究发现矿区深部流纹斑岩中存在斑岩型 Cu矿化，且获得该流纹斑岩 LA-ICP-MS锆石 U-Pb年龄为 253.2±1.7 Ma，形成于晚二叠世。赋矿流纹斑岩 SiO2含量为 75.56%~76.01%， Na2O+K2O含量为 4.09%~7.68%， K2O/ Na2O为 0.92~11.78， A/CNK为 1.05~2.41，属高硅、高钾钙碱性过铝质岩石。该流纹斑岩明显富集 Rb、 K等大离子亲石元素( LILE)，亏损 Nb、 Ti、 P等高场强元素( HFSE)；稀土总量( ∑REE)为 245× 10-6~265×10-6，轻重稀土元素分馏明显( La/Yb) N=7.76~9.96)，并表现出 Eu负异常( δEu=0.03~0.38)。综合分析认为那更康切尔沟矿区可能存在多期岩浆活动，形成斑岩型和热液脉型叠加成矿，该认识对本矿区乃至区域上寻找与火山-次火山热液有关的多金属矿床，尤其是深部找矿工作具有重要的指导意义。 |
| 英文摘要: |
| The Nagengkangqieergou Ag-polymetallic deposit, located in the East Kunlun orogenic belt, is a large hydrothermal vein deposit discovered in recent years. In this study, porphyry Cu mineralization was found in the rhyolite porphyry in the deep part of the mining area. In this paper, the LA-ICP-MS zircon U-Pb age of the rhyolite porphyry with porphyry mineralization is 253.2±1.7 Ma, which was formed in the Late Permian. The content of SiO2 and Na2O+K2O in the ore-bearing rhyolite porphyry is 75.56%~76.01% and 4.09%~7.68%, respectively, while the ratio of K2O/Na2O and A/CNK is 0.92~11.78 and 1.05~2.41. It belongs to high-silicon, high-potassium calc-alkaline peraluminous to strong peraluminous rocks. The rhyolite porphyry is obviously enriched in large ion lithophile elements (LILE) such as Rb and K, and depleted in high .eld strength elements (HFSE) such as Nb, Ti and P; the total amount of rare earth (∑REE) is 245×10-6~265×10-6, and the light and heavy rare earth elements are signi.cantly fractionated ((LA/Yb)N = 7.76~9. 96), and show a strong negative Eu anomaly (δEu = 0.03~0.38). Comprehensive analysis suggests that there may be multiple periods of magmatic activity in the Nagengkangqieergou mining area, forming porphyry and hydrothermal vein superimposed metallogenic features. The understanding has important indications for searching for polymetallic deposits related to volcanic-secondary volcanic hydrothermal solution in the mining area and even in the region, especially for deep prospecting. |
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