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
40Ar-39Ar Age of Sericite and Its Geological Significance in Qianhongquan Gold Deposit，Beishan Area，Gansu Province
DING Shuhong
Fourth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources，Jiuquan735000，Gansu，China
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 using40Ar-39Ar.The40Ar-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 l
封装外壳
arge-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.
Key words：40Ar-39Ar dating；sericite；metallogenic epoch；geological significance；Qianhongquan gold deposit；Beishan orogenic belt
矿床之一
俄罗斯多金属公司（Polymetal）宣布，远东地区的托姆托尔（Tomtor）铌和稀土金属矿床可能成为世界三大稀土矿床之一。公司持有该项目少量股份。 托姆托尔是俄罗斯计划扩大稀土金属产量所希冀的主要项目。稀土用于国防工业和手机以及电动汽车纳米金粉
的生产。“托姆托尔的规模和品位都证实该矿是世界上最大的铌和稀土矿床之一”，多金属公司首席执行官维塔利·奈西斯（Vitaly Nesis）在公告中称。
多金属公司是一家大型金银生产商，持有开发该项目的三弧矿业公司（Three Arc Mining Ltd）
9.1%的股份。维塔利的兄弟——俄罗斯商人亚历机械制图模型
山大·奈西斯，持有该项目和多金属公司多数股份。
三弧公司目前已经开始准备该项目的融资可行性
研究。
这家银矿企业1月份时曾表示，受到疫情影
响，托姆托尔项目已经延迟了6~9个月。之前曾预
计该项目2025年投产，可年产矿石16万吨。
丝绵机初步估计，拖姆托尔符合澳大利亚联合矿石储
槐木可以做防腐木吗量委员会（JORC）标准的储量为铌氧化物70万吨，
稀土氧化物170万吨。澳大利亚的芒特韦尔德
（MT Weld）和格陵兰的科瓦内湾（Kvanefjeld）为另
发光片
外2个最大稀土矿床。
（来源：中国矿业网）
2021年4月第29卷·第2期183
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