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  • ISSN 1005-2518 
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矿产勘查与资源评价

甘肃北山前红泉金矿床绢云母40Ar-39Ar年龄及其地质意义

  • 丁书宏
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  • 甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃 酒泉 735000
丁书宏(1968-),男,甘肃泾川人,高级工程师,从事区域地质调查及矿产勘查工作。490216481@qq.com

收稿日期: 2021-03-08

  修回日期: 2021-04-18

  网络出版日期: 2021-05-28

基金资助

甘肃省基础地质调查项目“甘肃省玉门市前红泉—黑山北滩地区1∶5万矿产远景调查”(甘财经二[2017]105号)

40Ar-39Ar Age of Sericite and Its Geological Significance in Qianhongquan Gold Deposit, Beishan Area,Gansu Province

  • Shuhong DING
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  • Fourth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources,Jiuquan 735000,Gansu,China

Received date: 2021-03-08

  Revised date: 2021-04-18

  Online published: 2021-05-28

摘要

前红泉金矿位于甘肃北山造山带南部,是新近发现的金矿床,其成矿时代缺乏准确约束。通过对该矿床矿石中蚀变绢云母进行40Ar-39Ar测年工作,获得蚀变绢云母40Ar-39Ar坪年龄为(250.4±1.0)Ma,正等时线年龄为(251.3±1.1)Ma,表明其成矿时代为早三叠世。前红泉金矿与北山南带众多金属矿床成矿时代相当,具相似的成矿地质背景。综合前人研究成果,认为三叠纪是北山地区一次大规模金属矿床成矿期,造山后伸展阶段是大量金属矿产产出的有利大地构造背景。

本文引用格式

丁书宏 . 甘肃北山前红泉金矿床绢云母40Ar-39Ar年龄及其地质意义[J]. 黄金科学技术, 2021 , 29(2) : 173 -183 . DOI: 10.11872/j.issn.1005-2518.2021.02.039

Abstract

The newly-discovered Qianhongquan gold deposit is located in the southern part of the Beishan orogenic belt,but there is a lack of accurate constraints about its metallogenic epoch.In this work,the altered sericite from the ores of this deposit was dated using 40Ar-39Ar.The 40Ar-39Ar plateau and isochron ages of the altered sericite are (250.4±1.0)Ma and (251.3±1.1)Ma,respectively,indicating the ore-forming age is Early Triassic.Previous studies have shown that magma intrusion and mineralization are closely related to the Beishan area.Beishan Mountains at Triassic belonged to a post-collisional geotecture environment.Under the action of post-collision intracontinental extension,massive granitic magma upwelled along the shear zone and provided thermal power and routes for the activation and migration of ore-forming materials,thus creating favorable conditions for large-scale metal mineral metallogenesis in this region.Qianhongquan gold deposit has similar metallogenic epoch and metallogenic geological background as those complex deposits in the southern part of the Beishan orogenic belt.Based on previous research results,it is believed that the Triassic was a period of large-scale metal deposits in Beishan area,and the post-orogenic extending stage was a favorable geotecture background for the occurrence of abundant metal minerals.These facts will constructively guide gold deposit metallogenic mechanism research and gold prospecting in Beishan Mountains,which must be highly valued by geological workers.

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