Subdivision and Correlation of Mid-Late Permian Successions of the Baoshan Block, Western Yunnan: Status and Problems

详细信息   

• 责任者：Jin Xiaochi（Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China） ; Huang Hao
• 刊名：Acta Geoscientica Sinica
• 出版年：2008
• 卷期：29(5)
• 关键词：中二叠世 ; Middle Permian ; 晚二叠世 ; Upper Permian ; 云南 ; Yunnan
• 页码：p.533-541
• 图表：5 illus., 30 refs.
• 分类号：1200
• issnNo：ISSN1006-3021
• isbnNo：CN11-3474/P

摘要

During the mapping course of geological maps of the scale of 1∶200 000 some 20 years ago, a number of formations were erected. The shortcomings of the work at that time, which resulted in confusion in subdivision and correlation of the Middle-Late Permian sediments are: 1) the Hewanjie Formation in the northern part was assigned to the Middle Triassic based on some bivalves, while the Permian foraminifers in its lower part were not properly studied; 2) the Yongde Formation erected in the southern part included not only the red and variegated clastics in the lower part but also argillaceous limestones in the upper part; and 3) age indicated by fossils found in some beds were treated as the age of the whole formation.