摘要
扬子地台西缘的四川会理河口地区广泛出露辉长岩,呈岩墙、岩床状侵入于河口群中,且被认为与拉拉铁铜矿的成矿有密切联系。本文对侵入于河口群中的辉长岩进行地质特征研究,采用锆石LA-ICP-MS测年方法,获得了1728 Ma±19 Ma和1037 Ma±22 Ma两期锆石U-Pb年龄。结合河口群的年龄资料和区域构造演化背景,对辉长岩成岩背景、形成时代及演化等进行了研究,结合辉长岩与区域铁铜矿的时空关系探讨了区域辉长岩的成矿作用。
Gabbro is widely exposed in Hekou area of Huili county at the Western margin of the Yangtze platform occurring as dykes and sills intruding in strata of Hekou group.The gabbro is considered to be closely related to Lala Fe-Cu deposits.U-Pb age dated by LA-ICP-MS method is 1728 Ma±19 Ma and 1037 Ma±22 Ma.Based on age data of the Hekou group and the regional tectonic evolution background,the roch-forming time and evolution of the gabbro are studied;based on the regional temporal and spatial relation of the gabbro and Fe-Cu deposits,the regional ore-forming process of the gabbro studied.
作者
龚晓波
胡阳
廖阮颖子
郭道军
GONG Xiaobo;HU Yang;LIAO Ruanyinzi;GUO Daojun(106 Geological Brigade of Sichuan Bureau of Geology and Mineral Resources, Chengdu 611130, China)
出处
《地质找矿论丛》
CAS
2021年第3期283-287,共5页
Contributions to Geology and Mineral Resources Research
基金
中国地质调查局“龙门山滇中成矿带通安和宁蒗地区地质矿产调查”项目(编号:DD20160017)资助。
关键词
河口群
辉长岩
地质特征
成矿作用
四川省
Hekou group
gabbro
geological characteristics
mineralization
Sichuan province
