黑龙江宝山夕卡岩型铜钼钨多金属矿床成岩成矿时代及其地质意义  

Diagenetic and Metallogenic Ages of Baoshan Cu-Mo-W Deposit in Heilongjiang Province,China and Its Geologic Significance

作　　者：刘瑞萍[1,2] 顾雪祥[2] 章永梅[2] 谢胜凯[1] 郑硌[2] 王佳琳[2] 郭冬发[1] 

机构地区：[1]核工业北京地质研究院,北京100029 [2]中国地质大学地质过程与矿产资源国家重点实验室,北京100083

出　　处：《矿物学报》2017年第3期276-284,共9页Acta Mineralogica Sinica

基　　金：国家自然科学基金(编号:41572062;41302064;U1303292);中国地质调查局地质调查工作项目(编号:1212011120686);中国核工业地质局项目(编号:201590);核工业北京地质研究院院长青年科技创新基金项目(编号:测QJ1601)

摘　　要：宝山铜钼钨多金属矿床为小兴安岭—张广才岭成矿带上的一个典型夕卡岩型矿床,赋存于花岗闪长岩-正长花岗岩体与下寒武统铅山组富镁质碳酸盐岩的接触部位。本文通过锆石LA-ICP-MS U-Pb同位素定年,获得赋矿花岗闪长岩的成岩年龄为(248.4±2.1)Ma,表明其侵位时代为早三叠世。对矿石中的辉钼矿进行了Re-Os同位素分析,获得等时线年龄为(242.0±1.0)Ma,加权平均年龄为(241.9±1.7)Ma。成矿、成岩作用发生于早—中三叠世,与古亚洲洋闭合时间吻合,发生于大陆碰撞环境中。Baoshan Cu-Mo-W deposit is a typical skarn deposit located in the northern section of the Xiaoxing＇anling-Zhangguangcailing metallogenic belt. It occurs at the contact zone between granitoid rocks and carbonate rocks of the Cambrian Qianshan Formation. In this paper, we present new data about zircon U-Pb age of ore-hosting granodiorite and molybdenite Re-Os age. The LA-ICP-MS U-Pb zircon analyses yield a concordia age of （248.4± 2.1 ） Ma for granodiorite, indicating that the granodiorite was intruded in the Early Triassic. The Re-Os isochron age of molybdenlte is （242. 0±1. 0） Ma with a weighted average of （241.9±1.7） Ma, which is slightly younger than the emplacing age of granodiorite. Intrusion of the granodiorite and associated Cu-Mo-W mineralization occurred in a collisional tectonic setting during the Early-Middle Triassic, which is related to the closure of the Paleo-Asian Ocean.

关 键 词：U-PB同位素定年 RE-OS同位素定年 夕卡岩型矿床 宝山 黑龙江省 

分 类 号：P611[天文地球—矿床学]