Re-Os dating of molybdenite from the Fenghuangshan skarn Cu deposit in Tongling, Anhui Province and its geological significance
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摘要: 铜陵矿集区是我国长江中下游Cu-Au-Fe-Mo成矿带中最重要的有色金属基地之一,凤凰山矿床是铜陵矿集区的重要组成部分,为一个典型的夕卡岩型铜矿床。本文利用Re-Os同位素定年方法对凤凰山铜矿床进行了成矿时代测定,获得了辉钼矿的Re-Os同位素模式年龄范围为139.1±2.4~142.0±2.2Ma,等时线年龄为141.1±1.4Ma,与矿区内石英二长闪长岩和花岗闪长岩SHRIMP锆石U-Pb年龄(144.2±2.3Ma)相吻合,也与铜陵地区其他矿田的成矿时代基本一致,可能为岩石圈减薄事件的成矿响应。
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关键词:
- 辉钼矿Re-Os年龄 /
- 夕卡岩 /
- 凤凰山铜矿 /
- 铜陵矿集区
Abstract: Tongling is one of the most significant ore cluster area in the Middle-Lower Yangtze River Cu-Au-Fe-Mo metallogenic belt. The Fenghuangshan Cu deposit is a typical skarn type Cu deposit in the Tongling ore cluster area. In this study we yield molybdenite Re-Os model ages ranging from 139.1±2.4 to 142.0±2.2Ma and the isochronal age 141.1±1.4Ma. The results show that Cu mineralization of the Fenghuangshan Cu deposit occurred at the Early Cretaceous, which are slightly younger than quartz monzodiorite and granodiorite(144.2Ma, zircon U-Pb age). The ages indicate close temporal relations between Cu mineralization and magmatism. Our study is consistent to previous studies that Cu mineralization occurred at the Mesozoic second mineralization stage, responding to the Mesozoic lithosphere delamination event in south of China. -
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