赣南张天堂地区岩体型钨矿晚侏罗世成岩成矿的同位素年代学证据  

Isotope chronological evidence for Upper Jurassic petrogenesis and mineralization of altered granite-type tungsten deposits in the Zhangtiantang area,southern Jiangxi

作　　者：丰成友[1] 丰耀东[2] 许建祥[3] 曾载淋[3] 佘宏全[1] 张德全[1] 屈文俊[4] 杜安道[4] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]河南省地矿局第三地质调查队,河南信阳464000 [3]江西省地勘局赣南地质调查大队,江西赣州341000 [4]国家地质实验测试中心,北京100037

出　　处：《中国地质》2007年第4期642-650,共9页Geology in China

基　　金：中国地质调查局地质大调查项目(1212010561603-2)资助。

摘　　要：摇篮寨钨矿是新近发现于赣南张天堂地区的代表性岩体型钨矿床。笔者对其含矿岩体和矿石进行了成岩成矿年龄精测,分别获得细粒似斑状白云母花岗岩锆石SHRIMP U-Pb年龄为(156.9±1.7)Ma(n=11,MSWD=3.3),浸染状辉钼矿Re-Os同位素的模式年龄为(155.2±2.3)Ma～(156.5±2.1)Ma、等时线年龄为(155.8±2.8)Ma(n=4,MSWD=0.49)。结合区域最新获得的高精度测年数据的分析,结果表明,本区钨矿床形成于晚侏罗世(集中在150～160Ma),钨成矿和与之有密切成因关系的花岗岩类岩体成岩不存在明显时差(1～5Ma),本区的钨锡成矿对应于华南中生代第二次大规模成矿作用。Located in the Zhangtiantang area, southern Jiangxi, the recently discovered Yaolanzai deposit is a typical altered granite- type tungsten deposit. Through highly precise dating of the ages of petrogenesis and mineralization of the tungsten deposit, the authors obtained a SHRIMP U-Pb zircon age of 156.9±1.7 Ma （n=11, MSWD=3.3） for porphyritic fine-grained muscovite granite and Re-Os model ages of 155.2±2.3 to 156.5±2.1 Ma and an isochron age of 155.8±2.8 Ma （11=4, MSW1）=0.49） for disseminated molybdenite in ores. According to the above-mentioned ages, combined with the highly precise age data obtained at a regional scale recently, the authors conclude that the tungsten deposits in this area formed in the Upper Jurassic. with their isotopic ages clustering at 150-160 Ma, There is no significant time gap （1-5 Ma） between tungsten mineralization and petrogenesis of its closely related granitoids. The W-Sn nfineralization in the area corresponds to the regional-scale Mesozoic second large-scale mineralization in South China.

关 键 词：岩体型钨矿 晚侏罗世成岩成矿 U—Pb Re—Os 锫石 辉钼矿 张天堂 赣南 

分 类 号：P618.67[天文地球—矿床学] P597.1[天文地球—地质学]