张家口朱家洼钼矿床锆石U-Pb、辉钼矿Re-Os年龄及其地质意义  

Zircon U-Pb and Molybdenite Re-Os Ages of Zhujiawa Molybdenum Deposit in Zhangjiakouand Their Geological Significance

作　　者：赵金龙 李随民 王昕 赵醒 陈雨 ZHAO Jin-long;LI Sui-min;WANG Xin;ZHAO Xing;CHEN Yu(Hebei GEO University,Shijiazhuang 050031,China;Hebei Geological Survey Institute,Shijiazhuang 050081,China)

机构地区：[1]河北地质大学,河北石家庄050031 [2]河北省地质调查院,河北石家庄050081

出　　处：《河北地质大学学报》2022年第2期27-38,共12页Journal of Hebei Geo University

基　　金：河北省国土资源厅项目(2013045650);河北省地矿局项目(454-0601-YBN-QEXZ)。

摘　　要：张家口朱家洼钼矿床是最近几年发现的与酸性岩体有关的钼矿床。矿床研究程度较低,矿床及赋矿酸性岩体形成时代均未知,本文通过对赋矿酸性岩体中锆石U-Pb和辉钼矿Re-Os同位素测年方法,获得岩体形成年龄为(145.9±1.2) Ma(n=22,MSWD=0.39);辉钼矿加权平均年龄为(140.3±1.9)Ma(n=6,MSWD=3.4);等时线年龄为(141.7±2.9) Ma(n=6,MSWD=5.2)。成岩成矿年龄相差不大,说明岩体矿体形成于同一时期。应用测年技术不仅可以获得钼矿带内钼矿床的形成时代,而且可以为确定成矿物质来源提供一定的依据。矿床形成时期为晚侏罗世,该时期处于燕山运动强烈的构造变形与大范围的岩浆活动时期。Zhangjiakou Zhujiawa molybdenum deposit is a molybdenum deposit related to acid rock mass discovered in recent years. The research degree of the deposit is low, and the formation age of the deposit and the ore bearing acid rock mass is unknown. In this paper, the zircon U-Pb and molybdenite Re-Os isotopic dating method in the ore bearing acid rock mass shows that the formation age of the rock mass is(145. 9±1. 2) Ma(n = 22, MSWD= 0. 39);the weighted average age of molybdenite is(140. 3±1. 9) Ma(n = 6, MSWD = 3. 4);the isochron age was(141. 7 ± 2. 9) Ma(n = 6, MSWD = 5. 2). There is little difference in diagenetic and metallogenic ages, indicating that the rock body and ore body were formed in the same period. The application of dating technology can not only obtain the formation time of molybdenum deposits in the molybdenum ore belt, but also provide some basis for determining the source of ore-forming materials. The formation period of the deposit is the late Jurassic,which is in the period of strong tectonic deformation and large-scale magmatic activity of Yanshan movement.

关 键 词：锆石U-PB测年 RE-OS同位素测年 钼矿 

分 类 号：P597[天文地球—地球化学]