河南祁雨沟金成矿系统辉钼矿Re-Os年龄和锆石U-Pb年龄及Hf同位素地球化学
Molybdenite Re-Os age and zircon U-Pb age and Hf isotope geochemistry of the Qiyugou gold system, Henan Province
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摘要: 河南祁雨沟金矿位于秦岭造山带最北部，属典型的角砾岩筒型成矿系统。矿区16号角砾岩筒下伏斑岩体锆石的εHf(t)值为-10.50~-14.43，Hf模式年龄为2.57~2.93Ga，表明花岗斑岩主要来源于古老下地壳的部分熔融。锆石LA-ICPMS U-Pb年龄为134.1±2.3Ma，与7号角砾岩筒中的辉钼矿Re-Os等时线年龄135.6±5.6Ma一致。这些年龄数据与熊耳山地区燕山期花岗岩体的侵位年龄基本相同，共同指示其形成于地壳缩短增厚之后的伸展减薄过程。熊耳地体的地壳缩短增厚缘于同碰撞时期沿马超营断裂带的A型俯冲作用，而A型俯冲导致了包括祁雨沟金矿系统、燕山期花岗岩类和脉状造山型矿床在内的熊耳矿集区的形成。Abstract: The Qiyugou gold system in Henan Province is hosted in breccia pipes in the Xionger terrane of the northernmost Qinling Orogen, and is consequently of typical breccia pipe-type deposits in genetic classification. Zircon grains from the granite porphyry underlying the No. 16 breccia pipe yield εHf(t) values of -10.50~-14.43 and Hf model ages of 2.57~2.93Ga, indicating that they originated from partial melting of an ancient crust. The granite porphyry is dated to be 134.1±2.3Ma by LA-ICPMS zircon U-Pb method, which is in accordance to the Re-Os isochron age of 135.6±5.6Ma of the molybdenite flakes from the No. 7 breccia pipe. These ages are also consistent with zircon U-Pb ages of the other granites in the Xiong’er terrane, and holistically suggesting that the Qiyugou breccia-pipes emplaced during Early Cretaceous crustal extension-and-thinning following a crust shortening-and-thickening which was caused by the syn-collisional northward A-type subduction along the Machaoying fault. The A-type subduction led to the formation of the Xiong’er Au-dominated ore-province including the Qiyugou Au system, Yanshanian granites and orogenic-type lode deposits.
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Key words:
- Zircon LA-ICPMS U-Pb age /
- Hf isotope /
- Molybdenite Re-Os age /
- Qiyugou gold system /
- Xiong’er terrane /
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