桂东大瑶山成矿带花岗岩类岩石年代学格架的厘定

doi:10.13278/j.cnki.jjuese.201506115

摘要/Abstract

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。

关键词: 花岗岩类, 年代学, LA-ICP-MS定年, 大瑶山成矿带

Abstract:

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.

Key words: granitoids, geochronology, LA-ICP-MS dating, Dayaoshan metallogenetic belt

中图分类号:

P588.12

秦亚, 张青伟, 康志强, 李赛赛, 冯佐海, 杨启军, 庞保成, 白令安, 谢永彬, 叶鸣. 桂东大瑶山成矿带花岗岩类岩石年代学格架的厘定[J]. 吉林大学学报(地球科学版), 2015, 45(6): 1735-1756.

Qin Ya, Zhang Qingwei, Kang Zhiqiang, Li Saisai, Feng Zuohai, Yang Qijun, Pang Baocheng, Bai Ling'an, Xie Yongbin, Ye Ming. Geochronological Framework of Granitoids in Dayaoshan Metallogenic Belt,Eastern Guangxi Province[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(6): 1735-1756.

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