新疆北部布尔克斯岱金矿床^(40)Ar-^(39)Ar同位素年代学研究  

^(40)Ar-^(39)Ar Isotope Chronology of the Buerkesidai Gold Deposit, Xinjiang

作　　者：曾庆栋[1] 沈远超[1] 刘铁兵[1] 李光明[1] 申萍[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029

出　　处：《吉林大学学报（地球科学版）》2005年第1期12-16,共5页Journal of Jilin University：Earth Science Edition

基　　金：中国科学院创新工程项目(KZCX3-SW-137);国家科技攻关项目(2001BA609A-07-08)

摘　　要：布尔克斯岱金矿床是新疆北部萨吾尔山东段重要的金矿床之一,对该金矿床成矿阶段两个石英样品进行快中子活化法测年,谱线特征均为马鞍型,其坪年龄分别为(335.5±0.3) Ma、(336.2±0.4) Ma,最小视年龄分别为(334.9±8.3) Ma、(334.6±10.3) Ma,等时线年龄分别为(335.5±1.2) Ma、(336.8±0.5) Ma。坪年龄代表了含金石英脉的形成时代,相当于晚海西期。新疆北部金矿形成可能与碰撞造山作用有关。Buerkesidai gold deposit is one of the important gold deposits in east segment of the Sawuer Mountain, Northern Xinjiang. Two quartz (formed in ore-forming stage) samples collected from the Buerkesidai gold deposit were determined by ()^(40)Ar-^(39)Ar fast-neutron activation techniques, and their spectra are characterized by the saddle-shape. The samples obtained plateau ages of (335.53±0.32) Ma and (336.16±0.39) Ma, minimum appearance ages of (334.85±8.25) Ma and (334.55±10.25) Ma and isochron ages of (335.53±1.19) Ma and (336.78±0.50) Ma respectively. The three ages are close to each other, indicating the reliability of the ages of the quartz samples. The plateau ages belong to Hercynian epoch and could represent the forming age of the gold-bearing quartz vein. Gold metallogenesis in northern Xinjiang is thought to be related to collision orogeny.

关 键 词：^40Ar-^39Ar快中子活化法 金矿床 布尔克斯岱 新疆北部 

分 类 号：P618.51[天文地球—矿床学] P597[天文地球—地质学]