四川会理河口地区辉长岩地质特征及其成矿作用  

Geological characteristics and mineralization of gabbro in Huili county,Sichuan province

作　　者：龚晓波[1] 胡阳[1] 廖阮颖子 郭道军[1] GONG Xiaobo;HU Yang;LIAO Ruanyinzi;GUO Daojun(106 Geological Brigade of Sichuan Bureau of Geology and Mineral Resources, Chengdu 611130, China)

机构地区：[1]四川省地质矿产勘查开发局一〇六地质队,成都611130

出　　处：《地质找矿论丛》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。

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.

关 键 词：河口群 辉长岩 地质特征 成矿作用 四川省 

分 类 号：P588.124[天文地球—岩石学]