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湖南塔山花岗岩SHRIMP锆石U-Pb年龄及其地质意义

SHRIMP zircon U-Pb age of Tashan granitic pluton from Hu’nan Province and its geological significance

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【作者】 郭爱民陈必河陈剑锋杜云郑正福周超田磊樊晖

【Author】 GUO Aimin;CHEN Bihe;CHEN Jianfeng;DU Yun;ZHENG Zhengfu;ZHOU Chao;TIAN Lei;FAN Hui;Hunan Institute of Geological Survey;School of Geoscience and Infophysics/Central South University;

【机构】 湖南省地质调查院中南大学地球科学与信息物理学院

【摘要】 塔山花岗岩体位于湘南阳明山-塔山东西向构造-岩浆带东端,为呈近东西向延伸的岩基,出露面积约200km~2。岩体侵入于古生代地层中,接触面倾向围岩,倾角30°~50°,由四侵入次岩体组成,之间多为脉动接触关系,主要岩性为黑云母二长花岗岩。第二侵入次岩体SHRIMP锆石U-Pb年龄为218±3Ma,第三侵入次岩体SHRIMP锆石U-Pb年龄为215±3Ma。由此表明,塔山花岗岩形成于晚三叠世,相邻单元之间的时间间隔为3~5Ma。阳明山-塔山东西向构造-岩浆带主要形成于印支期。区内钨、锡、铜、铅、锌等多金属矿床丰富,找矿潜力较大,亦表明南岭地区不仅存在燕山期花岗岩成矿,印支期花岗岩也可成矿。

【Abstract】 Tashan granite pluton covering an area of 200km~2 is an EW-trending batholith which is located at the eastern end of the Yangmingshan-Tashan tectomagmatic belt in southern Hunan. The pluton intruded into the Paleozoic strata and its interface is inclined to the wall rock, with the dip angle ranges from 30° to 50°. The pluton is composed four periods of pulsation intrusive rock bodies and its main lithology is biotite adamellite. The SHRIMP zircon U-Pb age of the second-stage pluton is 218±3Ma and the third is 215±3Ma, as measured by the Beijing SHRIMP Center of Chinese Academy of Geological Sciences. It is suggested that the Tashan pluton was formed in the Late Triassic period, and the age gap with the neighboring intrusive bodies is 3~5Ma, suggesting that the EW-trending Yangmingshan-Tashan tectomagmatic belt was probably formed in Indo-Chinese epoch. This area is rich in tungsten, tin, copper, lead and zinc polymetallic deposits and has bright future for ore prospect in that the mineralization in the Nanling region occurred not only in Yanshanian epoch but also in Indo-Chinese epoch.

【基金】 中国地质调查局项目《湖南上堡地区矿产远景调查》(编号:1212011120809)、《湘东地区花岗岩与成矿关系研究》(编号:1212011220520)、《南岭成矿带中西段地质矿产调查》(编号:121201009000150002)
  • 【文献出处】 地质通报 ,Geological Bulletin of China , 编辑部邮箱 ,2017年Z1期
  • 【分类号】P588.121;P597.3
  • 【被引频次】1
  • 【下载频次】41
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