内蒙古西拉木伦河两岸志留_泥盆系碎屑锆石年龄及其构造意义_程胜东.pdf

1000-0569 /2014 /030 (07)-1909-21 Acta Petrologica Sinica 岩石学报 - 内蒙古西拉木伦河两岸志留泥盆系碎屑锆石年龄及其 * 构造意义 ＊ 程胜东1 方俊钦1 赵盼1 徐备1＊ 鲍庆中2 周永恒2 邓荣敬1 1 1 1 1 ＊ 2 2 1 CHENG ShengDong ，FANG JunQin ，ZHAO Pan ，XU Bei ＊ ，BAO QingZhong ，ZHOU YongHeng and DENG ＲongJing 1. ， ， 100871 北京大学造山带与地壳演化教育部重点实验室 北京大学地球与空间科学学院 北京 2. ， 110034 沈阳地质矿产研究所 沈阳 1. MOE Key Laboratory of Orogenic Belts and Crustal Evolution ;School of Earth and Space Sciences ，Peking University ，Beijing 100871，China 2. Shenyang Institute of Geology and Mineral Ｒesource ，Shenyang 110034，China 2013-10-10 收稿，2014-01-25 改回． Cheng SD ，Fang JQ ，Zhao P ，Xu B ，Bao QZ ，Zhou YH and Deng ＲJ. 2014. Detrital zircon ages of the Silurian-Devonian :1909 － 1921 clastic rocks in south and north banks of Xar Moron Ｒiver ，Inner Mongolia. Acta Petrologica Sinica ，30 (7) Abstract In order to determine closure time of the paleo-Asian Ocean at the northern margin of North China Craton ，sedimentary and detrital zircon U-Pb geochronological studies of the Upper Silurian strata on northern and southern margins of the Xar Moron Ｒiver have been carried out. Sample LX0831-11 was collected from silty slate of the Upper Silurian Xingshuwa Formation in Shuangjing area (Linxi)of the northern margin of Xar Moron Ｒiver ，which is mainly composed of lithic fragment (50% )，quartz (30% )and feldspar (15% )with a