地质通报Issue(1)：20-26,7.
冀北三叠系二马营组凝灰岩夹层的发现及其地质意义
摘要
Abstract
The Ermaying Formation, previously assigned to Middle Triassic, is distributed in Xiabancheng-Pingquan area and mainly composed of fluvial red sandstone and mudstone rocks. During 1∶50000 regional survey, the authors discovered for the first time a layer of rhyo-tuffite in the upper part of the Ermaying Formation. Zircon LA-ICP-MS U-Pb dating of the tuff sample yielded an age of 234.2±2.6Ma (MSWD=3.2). In combination with fossils, intrusive rocks and lithology, the authors hold that a more appropri⁃ate sedimentary time of the Ermaying Formation in northern Hebei may be Middle to Late Triassic. Furthermore, the appearance of tuff interlayer, as the response to a volcanic events, might be related to the collision between the Siberia Block and the North China Block during Middle to Late Triassic.关键词
凝灰岩/LA-MC-ICP-MS锆石U-Pb定年/二马营组/三叠系/冀北Key words
tuff/LA-MC-ICP-MS zircon U-Pb dating/Ermaying Formation/Triassic/northern Hebei分类
天文与地球科学引用本文复制引用
张运强,陈海燕,魏文通,申宗义,徐焱焱,田粉英,刘策..冀北三叠系二马营组凝灰岩夹层的发现及其地质意义[J].地质通报,2016,(1):20-26,7.基金项目
中国地质调查局项目 （）
