Rb-Sr isotopic Dating of Vein-like Sphalerites from the Chaima Au Deposit in Fengxian-Taibai Ore-concentration Area, Shaanxi Province and Its Geological Significance
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摘要: 柴蚂金矿床位于陕西省凤太矿集区西北部八卦庙超大型金矿床的西侧约0.5km处，二者在成矿地质背景和控矿条件等方面均相似。该矿床共划分出5个含矿带，其产出位置受地层和构造联合控制。本次工作对柴蚂金矿床中发育的脉状闪锌矿进行了Rb-Sr同位素测年研究，获得了等时线年龄为（210.8±2.4）Ma，即晚三叠世；闪锌矿的87Sr/86Sri值为0.710 55±0.000 11，指示铅锌矿化的成矿物质可能主要来源于大陆壳。结合前人的研究成果分析认为，凤太矿集区内的铅锌矿化和金矿化是在秦岭造山带印支期碰撞-后碰撞过程中同一时代同一成矿作用的产物。
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关键词:
- 脉状闪锌矿 /
- Rb-Sr同位素测年 /
- 柴蚂金矿床 /
- 凤太矿集区 /
- 陕西省
Abstract: The Chaima gold deposit is located at the northwest part of the Fengxian-Taibai ore-concentration area in Shaanxi Province, it is 0.5 km west to the super-large Baguamiao gold deposit, and both of them are similar in metallogenic geological environment and ore-controlling conditions. There are five ore-bearing zones in this deposit and their occurrences are controlled by both of lithology and structure. In this paper, the Rb-Sr isotopic dating has been carried out on the sphalerite from the sphalerite-galena vein of the main mineralization stage in the Chaima Au deposit, yielding an isochron age of (210.8±2.4) Ma, showing that the zinc mineralization was developed in Late Triassic. The 87Sr/86Sri ratio of the sphalerite is 0.710 55±0.000 11, indicating that the ore-forming materials are mainly derived from the continental crust. In the context of regional geology, it's suggested that lead-zinc mineralization and gold mineralization in the Fengxian-Taibai ore-concentration area are the common products in the Late Triassic collision process of the South Qinling orogenic belt, and the gold deposits and lead-zinc deposits are formed at the same era. -
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