覃斌贤,江海水,陈龑,吴先浪

• 1:桂林旅游学院
• 2:旅游管理学院
• 3:中国地质大学(武汉)
• 4:地球科学学院

摘要(Abstract)：

贵州省南部关刀地区在三叠纪位于南盘江盆地内的大贵州滩北西缘,属于碳酸盐台地边缘斜坡相沉积环境。关刀剖面因产出丰富的三叠纪牙形石而备受关注,前人已对该剖面的牙形石进行了详细的报道。本文在前人研究的基础上,详细重建了关刀剖面中-晚三叠世之交的牙形石序列,识别出安尼期晚期至卡尼期早期的8个牙形石间隔带,由下至上分别为:Neogondolella cornuta带、Budurovignathus truempyi带、Budurovignathus hungaricus带、Budurovignathus mungoensis带、Paragondolella inclinata带、Paragondolella foliata带、Quadralella polygnathiformis带和Quadralella intermedius带。其中,Paragondolella foliata带和Quadralella intermedius带首次识别于该剖面。据此,本文重新厘定了该剖面拉丁阶的底界和顶界。其中,以Budurovignathus truempyi的首现为标志,将拉丁阶的底界下移了14.8 m;以Budurovignathus mungoensis的首现为标志划分出了拉丁阶内Fassanian与Longobardian亚阶的界线;以Quadralella intermedius的首现代替Quadralella polygnathiformis的首现作为拉丁阶顶界的标志,将该剖面的上三叠统底界下移了10.2 m。

关键词(KeyWords)： 牙形石;生物地层;三叠纪;间隔带;贵州南部

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(41830320、41972033);; 科技部基础性工作专项(2015FY310100-11)共同资助

作者(Author): 覃斌贤,江海水,陈龑,吴先浪

DOI: 10.19839/j.cnki.dcxzz.2023.0019

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