地质学报2024，Vol.98Issue(3)：692-711,20.DOI:10.19762/j.cnki.dizhixuebao.2024051
滇西昌宁-孟连带二叠纪碎屑岩地层:存在问题和研究进展
Permian siliciclastic strata in the Changning-Menglian belt,western Yunnan,China:Problems and research progress
摘要
Abstract
The Changning-Menglian belt in western Yunnan is widely considered to be the remnants of Paleo-Tethys in this region and is of great significance in deciphering its evolution.However,understanding the relationship between lithostratigraphic units of different origins in this belt is a complex task.There are instances where strata of the same age exhibit drastically different lithology,while others show similar lithology despite having different ages.This complexity has posed a challenge to gaining a comprehensive understanding of the Paleo-Tethys evolution.The contents of some early-established formations were loosely defined due to the limitations of poor outcrops,complex structures,and a scarcity of large fossils.Consequently,these formations incorporated slices that were formed at different ages and environments.This is particularly true for the clastic formations previously assigned to the Permian.In this paper,we aim to analyze the contents of the Permian clastic formations established during the 1∶200,000 geological mapping conducted in the 1980s.Specifically,we focus on the Nanpihe Formation in the Gengma-Cangyuan area,located in the central-northern part of the belt,and the Laba Formation in the Lancang-Menglian area,situated in the southern part of the belt.We employ recent data on fossils,petrography,detrital zircon chronology,and extensive field observations to examine these formations.Our objective is to identify and organize the slices of different ages and lithology contained within the two formations.Additionally,we aim to redefine the content of the Nanpihe Formation,discuss the reasons for discontinuing the use of the Laba Formation as a distinct formation,and propose the naming of regionally identifiable succession slices within the Laba Formation after further in-depth study.关键词
昌宁-孟连带/二叠纪/碎屑岩/"南皮河组"/"'拉巴组"Key words
Changning-Menglian belt/Permian/clastic rocks/"Nanpihe Formation"/"Laba Formation"引用本文复制引用
金小赤,郑建彬,黄浩,闫振..滇西昌宁-孟连带二叠纪碎屑岩地层:存在问题和研究进展[J].地质学报,2024,98(3):692-711,20.基金项目
本文为国家自然科学基金项目(编号42172040,92155202,42372046)资助的成果. （编号42172040,92155202,42372046）
