安徽巢湖平顶山西坡剖面印度阶与奥伦尼克阶界线层高分辨率牙形石生物地层

赵来时; 童金南; 孙知明; 常德峰; 张克信; 张素新; MikeJ.Orchard

安徽巢湖平顶山西坡剖面印度阶与奥伦尼克阶界线层高分辨率牙形石生物地层

1.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074
2.
山东水利职业学院建筑工程系, 山东日照 276826
3.
中国地质大学地质过程与矿产资源国家重点实验室

基金项目:

国家自然科学基金项目 40325004

国家自然科学基金项目 40574028

国家自然科学基金项目 40621002

中国地质调查局重大基础研究项目 1212010610103

GPMR国家重点实验室开放课题 GPMR200606

详细信息

作者简介:
赵来时(1966-)男博士教授现主要从事三叠纪地层和牙形石古生物学研究.E-mail: lszhao@cug.edu.cn

中图分类号: P534.51
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出版历程
- 收稿日期: 2006-10-22
- 刊出日期: 2007-05-25

High-Resolution Conodont Biostratigraphy in the Induan-Olenekian Boundary Strata at West Pingdingshan Section, Chaohu, Anhui Province

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
Department of Architectural Engineering, Shandong Water Polytechnic, Rizhao 276826, China
3.
Geological Survey of Canada, 101-605 Robson St., Vancouver, B.C., V6B 5J3, Canada

摘要

摘要: 下三叠统印度阶与奥伦尼克阶全球候选层型剖面之一的中国安徽省巢湖市平顶山西坡剖面界线层, 经连续不间断采样获得大量牙形石化石并进行详细的分带工作, 建立了该界线层牙形石生物地层.由下往上划分为: 1. Neospathodus dieneri带; 2. N.waageni带.前者依次分为3个亚带: N.dieneri Morphotype1亚带, N.dieneri Morphotype2亚带和N.dieneri Morphotype3亚带.牙形石带可与该界线层的菊石带进行很好的对比; 在详细区分牙形石Neospathodus属内各种特征的基础上, 结合地层分布情况, 跨越印度阶与奥伦尼克阶界线, 演化谱系十分明显, 牙形石N.dieneri Morphotype3在奥伦尼克阶之底即Smithian初期演化为: N.dieneri Morphotype3→N.waageni→N.pingdingshanensis、Neospathodus dieneri Morphotype3→N.waageni (细齿直立型) →N.n.sp.R和Neospathodus dieneri Morphotype3→N.pakistanensis.从谱系演化的观点出发认为: N.waageni的首现点作为奥伦尼克阶底界是合理的, 并在该剖面确定了印度阶与奥伦尼克阶界线位于第24-16层, 距剖面大隆组与殷坑组界线40.49m处.
- 牙形石 /
- 演化谱系 /
- 下三叠统 /
- 印度阶与奥伦尼克阶界线 /
- 安徽巢湖
Abstract: Repeated (more than ten times) conodont analyses have recovered thousands of conodont specimens which are especially rich in the Induan-Olenekian boundary strata, at the West Pingdingshan Section located in Chaohu City, Anhui Province, a candidate GSSP of the Induan-Olenekian boundary. The most distinctive forms are the conodonts of the Neospathodus dieneri group and N. waageni group, as well as some new elements. Based on the general characteristics of the Neospathodus species and their biogeographic distribution, an evolutionary lineage of the species is proposed: N. dieneri Morphotype3→N. waageni→N. pingdingshanensis, Neospathodus dieneri Morphotype3→N. waageni (upright denticles) →N. n. sp. R and Neospathodus dieneri Morphotype3→N. pakistanensis. The first occurrence of N. waageni, which is regarded as the indicator of the Induan-Olenekian boundary, is situated at 40.49 m above the boundary between the Dalong and Yinkeng formations. The recognition of this evolutionary lineage of Neospathodus is of great importance for a better understanding and definition of the Lower Triassic conodont zonation.
- conodont /
- evolutionary lineage /
- Lower Triassic /
- Induan-Olenekian boundary /
- Chaohu of Anhui Province

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图 1 安徽巢湖交通位置和研究区地质简图(童金南等, 2005)

D₃.上泥盆统; C₁.下石炭统; C₂.上石炭统; P₁.下二叠统; P₂.中二叠统; P₃l.龙潭组; P₃d.大隆组; T₁y.殷坑组; T₁h.和龙山组; T₁n¹.南陵湖组下段; T₁n².南陵湖组中段; T₁n³.南陵湖组上段; T₂d.东马鞍山组; Q.第四系; A₁+A₂.马家山南剖面; B.平顶山西坡剖面; C.平顶山北剖面

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图 2 安徽巢湖平顶山西坡剖面印度阶-奥伦尼克阶界线处地层柱状图

Fig. 2. Stratigraphical column at the Induan-Olenekian boundary of the West Pingdingshan Section, Chaohu

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图 3 印度阶-奥伦尼克阶界线附近牙形石演化谱系

Fig. 3. Conodont lineages across Induan-Olenekian boundary

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表 1 安徽巢湖早三叠世牙形石带及其关键化石

Table 1. Lower Triassic conodont zonation and the key fossils in Chaohu

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