摘要
本文通过对区内岩浆岩LA-ICP-MS锆石U-Pb测年,识别出区内存在两期岩浆活动:第一期为闪长岩-闪长玢岩-闪长岩-花岗闪长岩-花岗闪长斑岩-花岗斑岩侵入,成岩时间在晚侏罗世到早白垩世之间,其中最早的花岗闪长斑岩侵位年龄为155.4Ma,其他岩浆岩略晚,但几乎是同时侵入,构成了牌楼中性-酸性复式岩体的主体;第二期为辉石闪长岩侵入,侵位年龄为134.2Ma,较之早期的杂岩体,第二期的岩浆岩岩性较简单。结合牌楼金多金属矿的辉钼矿Re-Os同位素测定结果,认为牌楼金多金属矿为岩体控制的斑岩型-中低温热液型金多金属矿床。
In this paper,two phases of magmatic activity have been identified by zircon LA-ICP-MS U-Pb dating of the magmatic rocks in the area. The first phase is the intrusion of diorite-diorite porphyrite-diorite-granodiorite-granodiorite porphyrygranite porphyry,ranging from the Late Jurassic to the Early Cretaceous.The earliest granodiorite porphyry is 155.4 Ma in age,and other magmatic rocks are bit younger,but they emplaced almost at the same time,forming the bulk of the Pailou intermediate-acid compound pluton.The second phase is the intrusion of pyroxene diorite at the age of 134.2 Ma,which is relatively simple in lithology compared with the earlier one.Considering the determination results of molybdenite Re-Os isotope,it is suggested that the Pailou copper-gold polymetallic deposit is a mesothermal-epithermal porphyry deposit controlled by rock mass.
作者
何世中
石磊
聂张星
古黄玲
杨晓勇
HE Shi-zhong;SHI Lei;NIE Zhang-xing;GU Huang-ling;YANG Xiao-yong(No.311 Unit,Bureau of Geology and Mineral Exploration of Anhui Province,Anqing,Anhui 246003,China;School of Earth and Space Sciences,University of Science and Technology of China,Hefei,Anhui 230026,China)
出处
《安徽地质》
2022年第1期1-6,22,共7页
Geology of Anhui
基金
安徽省国土资源厅资源科技项目“安徽东至县查册桥-石台县小河一带金多金属矿成矿作用与成矿规律研究”(编号:2016-K-1)资助。
关键词
牌楼金多金属矿
岩浆活动
成岩年龄
复式岩体
Pailou gold polymetallic deposit
magmatic activity
diagenetic age
compound pluton
