- 责任者：Chen Gaochao (Xi’an Center of Geological Survey ; China Geological Survey ; Xi’an 710054 ; China) ; Wei Xianyang
- 刊名：Geological Bulletin of China
- 出版年：2011
- 卷期：30(6)
- 关键词：早石炭世 ; Lower Carboniferous ; 碎屑岩 ; clastic rocks ; 铀—铅计时 ; U-Pb dating ; 内蒙古 ; Inner Mongolia
- 页码：p.955-961
- 图表：5 illus., 1 table, 6 refs.
- 分类号：1200
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
The CL images and trace element（Th/U0.4） of clastic zircons from Lower Carboniferous Baishan Formation in Alxa Right Banner indicate that most of them were derived from magma. The age of zircons varies from 412 Ma to 498 Ma, concentrated on 443~446 Ma, the weighted average age is（454.6±8.3）Ma（n=28）, MSWD=3.5, and the degree of confidence is 95%, corresponding probably to that of magmatic arc generated in Middle Tianshan Mountain during the northward subduction and attenuation of Southern Tianshan Ocean on the western lateral of the study area from Ordovician to Early Devonian. The data reveal that Engeerwusu fault is likely to be an Eopaleozoic suture zone belonging to oft-com:office:smarttags" />