滇西昌宁—孟连带耿马南皮河桥一带薄层灰岩地层发现二叠纪长兴期牙形类化石及其生物地层学意义  

CHANGHSINGIAN(LATE PERMIAN)CONODONTS DISCOVERED IN THE THIN-BEDDED LIMESTONES OF THE NANPIHE BRIDGE SECTION IN THE CHANGNING−MENGLIAN BELT,YUNNAN,CHINA AND THEIR BIOSTRATIGRAPHIC SIGNIFICANCES

作　　者：袁志伟 金小赤[1] 闫振 郑建彬[1] YUAN Zhi Wei;JIN Xiao Chi;YAN Zhen;ZHENG Jian Bin(Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037)

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《地层学杂志》2024年第3期329-336,共8页Journal of Stratigraphy

基　　金：国家自然科学基金(42172040、42372046)资助。

摘　　要：滇西昌宁—孟连带耿马县南部的南皮河桥一带出露了一套由深灰色薄层灰岩、硅质岩、泥岩组成的地层,以往被归入南皮河组。本研究通过对南皮河桥剖面的薄层灰岩样品开展牙形类化石的分析处理,获得了牙形类化石Hindeodus latidentatus、Hindeodus typicalis、Clarkina changxingensis和Clarkina praetaylorae,显示该剖面地层的时代为晚二叠世长兴期。结合岩性和地质时代,这套地层与原南皮河组的主体层段存在明显差异,后者为晚泥盆世至石炭纪最早期的具有浊积岩特征的中厚层砂岩夹薄层粉砂岩、泥岩和硅质岩序列。因此,南皮河桥剖面的这套地层宜在深入研究之后另行命名。The sedimentary successions exposed in the vicinity of the Nanpihe Bridge,south of Gengma County,in the Changning−Menglian Belt,western Yunnan,SW China are characterized by dark-colored thin-bedded limestones,silicalites(cherts),and mudstones,and previously placed in the former Nanpihe Formation.Conodonts obtained from the thin-bedded limestones of the section contain Hindeodus latidentatus,Hindeodus typicalis,Clarkina changxingensis,and Clarkina praetaylorae,which indicate a Changhsingian age.Both lithology and geological age of the studied succession show significant differences from the main body of the former Nanpihe Formation,the latter is characterized by a series of Late Devonian to the Earliest Carboniferous medium-to thick-bedded sandstones intercalated with thin-bedded siltstones,mudstones and cherts.Therefore,the successions represented by the Nanpihe Bridge section should be re-assigned after detailed study.

关 键 词：昌宁—孟连带 二叠纪 长兴期 牙形类 南皮河组 

分 类 号：P534.46[天文地球—古生物学与地层学]