福建政和大药坑金矿床脉岩锆石U-Pb测年及金成矿年龄  

Zircon U-Pb dating of the dikes in the Dayaokeng Gold Deposit in Zhenghe County,Fujian Province and the metallogenesis age

作　　者：王会胜 唐秀念 李绪俊[2] 王剑平 Wang Huisheng;Tang Xiunian;Li Xujun;Wang Jianping(Yuanxin Mining Company LTD.,Zhenghe County,Fujian Province;College of Earth Sciences,Jilin University;Shengli Geologging Company,Sinopec)

机构地区：[1]福建省政和县源鑫矿业有限公司,福建省南平市353600 [2]吉林大学地球科学学院 [3]中石化胜利石油工程有限公司地质录井公司

出　　处：《黄金》2021年第10期16-23,共8页Gold

基　　金：吉林大学地质攻关项目(3R217X444422)。

摘　　要：大药坑金矿床位于福建省政和县城北侧,是目前闽西北地区正在开采的重要金矿床之一。根据脉岩与金矿化的关系,矿区内脉岩可划分为成矿前、成矿期和成矿后3类。成矿前脉岩主要为偏碱性的中酸性脉岩,成矿期脉岩主要为酸性脉岩,成矿后脉岩主要为中基偏碱性脉岩。根据成矿前、成矿期、成矿后脉岩中锆石U-Pb测年结果,认为大药坑金矿床的成矿年龄为(107.7±7.0)Ma~(119.3±2.5)Ma,主期成矿年龄大于(112.4±1.9)Ma。脉岩中继承性锆石的U-Pb测年结果表明:闽西北地区深部可能存在较多太古宙地壳。Located to the north of the Zhenghe County,Fujian Province,the Dayaokeng Gold Deposit is one of the most important deposits in operation in Northewest Fujian.Based on the relationship between the dikes and gold mineralization in the deposit,these dikes can be divided into three types:pre-mineralization,syn-mineralization and post-mineralization.The pre-mineralization dikes are mostly relatively alkaline intermediate-acid ones,while the syn-mineralization dikes are acid ones and the post-mineralization dikes are intermediate to basic ones.Based on the U-Pb dating results for zircons in the pre-mineralization,syn-mineralization and post-mineralization dikes,it is concluded that the mineralization age of the Dayaokeng Gold Deposit is in the range of(107.7±7.0)-(119.3±2.5)Ma,with the major phase mineralization age greater than(112.4±1.9)Ma.Based on the U-Pb dating of the inherited zircons,the probable existence of the ancient Archean crust deep in the Northwest Fujian is suggested.

关 键 词：脉岩 锆石U-PB测年 浅成低温热液型金矿床 成矿年龄 大药坑金矿床 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]