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西藏冈底斯成矿带斑岩铜矿的成岩成矿年龄

, PP. 165-170

Keywords: 西藏,冈底斯成矿带,斑岩铜矿,同位素定年,意义

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Abstract:

近年来在西藏开展的资源评价和研究工作初步揭示出冈底斯成矿带斑岩铜矿床具有巨大的资源潜力。本文通过多种方法对冈底斯成矿带中驱龙、厅宫、冲江等斑岩铜矿进行了同位素定年研究,确定出冈底斯斑岩铜矿成岩年龄为(17.58±0.74)Ma(锆石离子探针(SHRIMP)),成矿年龄为(15.99±0.32)Ma(Re?Os等时线法),蚀变年龄介于12.00~16.5Ma之间(K?Ar法),成矿年龄与蚀变年龄较为一致。根据同位素定年结果,冈底斯斑岩铜矿的成岩成矿年龄明显晚于冈底斯碰撞期花岗岩质侵入岩的年龄。因此笔者认为,西藏冈底斯斑岩铜矿形成于碰撞后的伸展构造背景,与造山带山根拆沉和高原隆升作用密切有关。

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