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
Received date: 2021-03-08
Revised date: 2021-04-18
Online published: 2021-05-28
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
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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