吉林省中泥盆世变质火山岩系的发现:来自原机房沟(岩)组(群)中锆石LA-ICP-MS U-Pb测年的证据  

Discovery of Middle Devonian metavolcanite series in Jilin:evidence from zircon LA-ICP-MS U-Pb age of original Jifanggou Formation

作　　者：于宏斌[1] 陈会军[2] 聂立军[1] 刘世伟[2] 崔天日[2] 彭玉鲸[1] 刘跃文[1] 邸新[1] 周凯[1] 朱书宏[1] YU Hong-bin CHEN Hui-jun NIE Li-jun LIU Shi-wei CUI Tian-ri PENG Yu-jing LIU Yue-wen DI Xin ZHOU Kai ZHU Shu-hong(Regional Geologic and Mineral Resources Survey of Jilin Province, Changchun 130012, China Shenyang Center of China Geological Survey, Shenyang 110032, China)

机构地区：[1]吉林省区域地质矿产调查所,长春130012 [2]中国地质调查局沈阳地质调查中心,沈阳110032

出　　处：《世界地质》2017年第2期381-390,共10页World Geology

基　　金：中国地质调查局项目“东北地区花岗岩地质编图”(1212011121084)、“东北地区基础地质调查成果集成与综合研究”(1212011121134)和1:25万榆树市幅区域地质调查(1212011120726)联合资助

摘　　要：通过对"机房沟岩群"调查研究,确证其是一套由构造岩片堆叠组成的构造地层。笔者于九台县上河湾镇下洼子村后山、原"机房沟岩群"层型剖面变质酸性-中酸性火山岩系的两件样品(Pm001-6-2,Pm001-7-4)中,获锆石LA-ICP-MS U-Pb年龄分别为(389.4±3.0)Ma、(388.3±3.9)Ma,确定在吉林省内有中泥盆世吉维特期(Givetian)的火山岩地层存在。结合内蒙古自治区、黑龙江省及松嫩地块相对应的火山岩地层进行了对比研究,认为在"佳蒙地块"南缘,从老秃顶子—宝泉—下洼子—放牛沟过松嫩盆地至满都拉,存在一条早泥盆纪晚期—晚泥盆纪初期的火山岩带。Based on the study of Jifanggou rock group,the authors confirmed that it is a set of structure strata which is composed of tectonic slices. By collecting two samples （Pm001-6-2, Pm001-7-4） in the behind the Xiawazi of Shanghewan in Jiutai County, which is the original Jifanggou rock group metamorphic acid-intermediate acidic volcanic rocks, the authors obtained the zircon LA-ICP-MS U-Pb age of（389.4±3.0）Ma and（388.3±3.9）Ma, determining that there exists volcanic rock formation of Givet Period of Middle Devonian in Jilin Province. Integrating the correlation with volcanic rock formations in Inner Mongolia, Heilongjiang and Songnen massif, it is concluded that in the southern margin of Jia-Meng massif from Laotudingzi-Baoquan-Xiawazi-Fang-niugou through Songnen Basin to Mandula, there exists a volcanic rock belt in late Early Devonian- early Late Devonian.

关 键 词：机房沟岩群 锆石LA-ICP-MS U-Pb年龄 火山岩 松嫩地块东南陆缘 

分 类 号：P597[天文地球—地球化学]