桂东大瑶山成矿带花岗岩类岩石年代学格架的厘定  

Geochronological Framework of Granitoids in Dayaoshan Metallogenic Belt,Eastern Guangxi Province

作　　者：秦亚[1] 张青伟[1] 康志强[1] 李赛赛[1] 冯佐海[1] 杨启军[1] 庞保成[1] 白令安[1] 谢永彬 叶鸣[1] 

机构地区：[1]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541004 [2]广西壮族自治区地质环境监测总站,广西崇左532200

出　　处：《吉林大学学报（地球科学版）》2015年第6期1735-1756,共22页Journal of Jilin University：Earth Science Edition

基　　金：广西高校科研项目(002501215024;002501214032);广西自然科学基金项目(2014GXNSFBA118230);中国地质调查局项目(001102214062)

摘　　要：桂东大瑶山成矿带是指与侵入于大瑶山地区寒武纪浅变质岩系中的岩浆岩有关、呈近EW向展布的金-多金属成矿带。成矿带内花岗岩类岩浆活动强烈,多呈岩株、岩脉和岩筒状产出,主要岩性为花岗闪长岩、花岗斑岩、二长花岗岩和花岗闪长斑岩。笔者报道了成矿带内的大王顶岩体、大岸岩体、古龙岩体、大村岩体、社山复式岩体和思委岩体的LA-ICP-MS定年结果,并结合前人对大瑶山成矿带内花岗岩类的研究成果,建立了大瑶山成矿带花岗岩类的年代学格架。结果显示,大瑶山成矿带花岗岩类主要形成于加里东期(444.8±2.5)Ma和燕山晚期晚白垩世(96.6±1.1)Ma,燕山早期侏罗纪次之(164.2±2.8)Ma,且花岗岩类岩体侵位年龄与金-多金属矿床的成矿时代具有良好的对应关系。The Dayaoshan metallogenetic belt is a gold‐polymetallic ore‐bearing genetic belt extended in nearly EW , and exists in the Cambrian weakly metamorphic rocks .In this metallogenentic belt , different granitoids are dominated ,including granodiorite ,granite porphyry ,monzonite granite ,and granodiorite porphyry .They appear as dikes or pipes in the field ,a results of magmatic intrusion .The authors studied the chronology of these granitoids in the plutons of Dawangding ,Da’ an , Gulong , Dacun ,Sheshan ,and Siwei by using LA ICP MS .In combination with the previous geochronological data , the geochronological framework of the granitoids in Dayaoshan metallogenentic belt is reconstructed . The results show that the granitoids in Dayaoshan metallogenetic belt were mainly formed in Caledonian (444 .8 ± 2 .5 Ma) ,Early Yanshanian (Jurassic ;164 .2 ± 2 .8 Ma) ,and Late Yanshanian (Late Cretaceous ;96 .6 ± 1 .1 Ma ) . The gold and polymetallic mineralization ages are consistent with the ages of these granitoids .

关 键 词：花岗岩类 年代学 LA-ICP-MS定年 大瑶山成矿带 

分 类 号：P588.121[天文地球—岩石学] P618.2[天文地球—地质学]