【摘要】 西藏吉如斑岩铜矿位于冈底斯斑岩铜矿带的中段。锆石 SHRIMP U-Pb 和辉钼矿 Re-Os 年代学研究表明,与成矿相关的黑云母二长花岗岩成岩年龄为48.68±0.49Ma,成矿事件发生在48.30～50.8Ma。明显不同于冈底斯铜矿带形成于陆内后碰撞造山向伸展走滑转换的过渡环境的驱龙、冲江、朱诺等矿床(成岩成矿年龄集中在17～12Ma)。该矿床形成于印度.亚洲大陆主碰撞阶段,碰撞晚期(52～42Ma)的间歇性应力松弛造就了吉如铜矿黑云母二长花岗岩的侵位和斑岩型矿化的发育。这一成果表明,在中国西藏冈底斯斑岩铜矿带同时存在碰撞环境和后碰撞伸展环境的斑岩型铜矿。更多还原

【Abstract】 Jiru porphyry copper deposit is located in the central parts of the Gangdese Metallogenic belt in Tibet.In site zircon U-Pb ages and molybdenite Re-Os ages indicate that the intrusion age of ore-bearing biotite adamellite is 48.68+0.49Ma,whereas the mineralization age is 48.30-50.8Ma.obviously different from Qulong,Chongjiang and Zhunuo copper deposites,which were formed during the translation period of the Gangdese orogenic belt from continental collision to strike-slip extension.The Magmatic intrusions and Mineralization in these deposits were mainly formed at 17～12Ma.Magmatic intrusions and Mineralization of Jiru porphyry copper deposits formed during the intervallic relaxation (ca.52～42Ma) of the main Indian-Tibetan collisional orogenic setting.This conclusion indicate that there are different porphyry copper deposits formed in both collisional orogenic setting and post-collisional extension setting in Gangdese metallogenic belt,China更多还原