贵州兴义烂滩剖面中—上三叠统之交鱼类微体化石和牙形石生物地层  

Fish microremains and conodont biostratigraphy across the Middle—Upper Triassic boundary at the Lantan section, Xingyi area, Guizhou Province

作　　者：谢韬[1] 刘石磊 黄金元[1] 文芠[1] 楼雄英[1] 胡智丹 周长勇[1] XIE Tao;LIU Shilei;HUANG Jinyuan;WEN Wen;LOU Xiongying;HU Zhidan;ZHOU Changyong(Chengdu Center of China Geological Survey, Chengdu, 610081)

机构地区：[1]中国地质调查局成都地质调查中心,成都610081

出　　处：《地质论评》2019年第3期703-712,共10页Geological Review

基　　金：中国地质调查局项目"贵州1:5万兴义县;郑屯;安龙县幅区域地质矿产调查"(编号:12120114068101);"南盘江成矿区贞丰和富宁地区地质矿产调查"(编号:DD20160020);国家自然科学基金资助项目"应用同步加速器X射线层析显微技术重建云南罗平中三叠世牙形石多分子器官"(编号:41502013)的成果~~

摘　　要：贵州兴义烂滩剖面位于扬子地台西南缘,在该剖面第6层中发现3类辐鳍鱼牙齿化石,其伴生有介形类Cavellina jangyouensis,在12层中发现软骨鱼类鱼鳞化石和2类辐鳍鱼牙齿化石,在第14发现大量的粗菊石Trachyceras sp.。在该剖面上建立了2个牙形石带,自下而上分别为:Paragondolella polygnathiformis和Paragondolella tadpole带。根据牙形石特征,把中晚三叠世拉丁和卡尼期的界线定于12层底部。该剖面为该区中上三叠统之交的地层提供了较好的生物地层格架,对地层时代划分及区域对比具有重要意义。Objectives: The Lantan section is located on the southwestern margin of the Yangtze platform. Because of its special paleogeographic position,the research of the Lantan section has great significance for the biostratigraphic subdivision and stratigraphic comparison on the southwestern margin of the Yangtze platform.Methods: The main methods of this investigation are surveying section and conodont biostratigraphy in detail.At the same time,we study the characteristics of fish microremains at the Lantan section.Results: Three types of Actinopterygii teeth and Ostracods Cavellina jangyouensis were discovered in the bed 6 of the Lantan section. Elasmobranchii scales and two types of Actinopterygii teeth were discovered in the bed 12.Abundant of Trachyceras sp. were discovered in the bed 14. Two conodont zones have been established from bottom to top: Paragondolella polygnathiformis Zone and Paragondolella tadpole Zone.Conclusions: There are two types of scales and five types of teeth at the Lantan section from the Zhuganpo Formation,Xingyi,Guizhou Province. According to the characteristics of conodont,the boundary between Ladinian and Carnian is defined at the bottom of the bed 12. It can help to build the biostratigraphica framework for the Middle-Upper Triassic boundary nearby.

关 键 词：中-晚三叠世 竹杆坡组 鱼类微体化石 牙形石 贵州兴义 

分 类 号：Q915[天文地球—古生物学与地层学]