摘要
在云南省永宁地区,下二叠统(P1)上部砾屑灰岩被首次识别为重力流沉积,其重力流沉积可分为碎屑流沉积、滑塌(崩塌)沉积,以碎屑流沉积为主。通过沉积相、沉积物组份及物源分析,云南省永宁地区处于浅海斜坡断崖(陡坎)带,与华里西期伸展运动有关。因此,讨论砾屑灰岩成因,对该区的古构造发展,以及对峨眉山地裂运动开始时间的研究,都具有重要意义。
The calcirudite in upper P1 of Yongning area in Yunnan is identified as the debris flow sediment that can be divided as debris flow deposit、collapse deposit, and the main deposition is debris flow. By analysis of sedimentary facies、compositions of deposition and origin, it has been concluded that the area located in slope-bluff belt of shallow sea, and had pertinent with stretching movement during Haixi period. Therefore, the discussion about origin of calcirudite has significant means to ancient tectonic movement and the initiating time of Emei taphrogeny.
出处
《物探化探计算技术》
CAS
CSCD
2007年第6期530-533,470,共4页
Computing Techniques For Geophysical and Geochemical Exploration
关键词
二叠系
砾屑灰岩
重力流沉积
逆粒序
包卷构造
同生断裂
permian
calcirudite
gravity flow deposit
inverse grading
convolute structure
depositional fault
