云南东南部中三叠统个旧组研究新进展  

THE NEW PROGRESS OF STUDY ON MIDDLE TRIASSIC GEJIU FORMATION IN SE YUNNAN

作　　者：王伟 宋冬虎 赵云江 吕勃烨 WANG Wei;SONG Dong-hu;ZHAO Yun-jiang;LU Bo-ye(Yunnan Institute of Geological Survey,Kunming 650216)

机构地区：[1]云南省地质调查院

出　　处：《云南地质》2019年第2期151-154,共4页Yunnan Geology

基　　金：云南1∶5万二街、易门、鸣矣河、上浦贝幅区域地质调查(编号:DD2016001)

摘　　要：云南东南部中三叠统个旧组(T2g),是一套分布面积广、厚度大,且以碳酸盐岩为主体的地层。但从该组的创名以来,在其碳酸盐岩地层中一直未采获过有价值的古生物化石,直到后来在云南开展了能从碳酸岩中溶离、分解出牙形刺化石以后,才在该组一段到四段的碳酸盐岩地层中陆续发现一些非常重要的、具有特殊时代依据的牙形刺分带化石。个旧组一段发现Neogondolella regale;二段发现Nicoraella germanica和Nicoraella kockeli;三段发现Neogondolella bifurcata;四段发现Neogondolella constricta。从而为个旧组时代厘定为中三叠世Anisian(安尼期)提供了确凿的证据。Middle Triassic Gejiu Formation in SE Yunnan is a suite of strata in wide distribution,mega-thickness and mainly formed by carbonate rocks.People haven t collected any valuable fossil until a few very important and with special age significance conodont zonation fossils were discovered successively,such as Neogondolella regale in Gejiu Formation Member 1;Nicoraella germanica and Nicoraella kockeli in Member 2;Neogondolella bifurcate in Member 3;Neogondolella constricta in Member 4 which provide the determinative age confirmation of Middle Triassic Anisian for Gejiu Formation.

关 键 词：牙形石 分带化石 中三叠世Anisian期 个旧组 云南东南部 

分 类 号：P534.51[天文地球—古生物学与地层学]