安徽巢湖地区下三叠统综合层序

童金南; 赵来时; 左景勋; HansenHans J.; ZakharovYuri D.

安徽巢湖地区下三叠统综合层序

1.
地质过程与矿产资源国家重点实验实(中国地质大学), 湖北武汉 430074
2.
丹麦哥本哈根大学地质研究所, 哥本哈根 DK-1350
3.
俄罗斯科学院远东地质研究所, 符拉迪沃斯托克 690022

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 40232025

国家"973"项目 G200007705

教育部科技重点项目 03033

地质过程与矿产资源国家重点实验室开放基金项目 MGMR2002-22

详细信息

作者简介:
童金南(1962-), 男, 教授, 博士生导师, 现主要从事三叠纪及二叠系—三叠系界线地层和古生物学研究. E-mail: jntong@cug.edu.cn

中图分类号: P534.51
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出版历程
- 收稿日期: 2004-11-15
- 刊出日期: 2005-01-25

An Integrated Lower Triassic Sequence in Chaohu, Anhui Province

1.
State Key Laboratory ofGeo-Processes and Mineral Resources, China University ofGeosciences, Wuhan 430074, China
2.
Geological Institute, Copenhagen University, DK-1350 Copenhagen, Denmark
3.
Far Eastern Geological Institute, Russian Academy ofSciences, Vladivostok 690022, Russia

摘要

摘要: 印度阶-奥伦尼克阶界线的全球层型候选剖面之一位于安徽巢湖地区; 巢湖地区的下三叠统也是国际上同期地层中生物地层序列最有代表性、多重地层学手段应用齐备、研究效果最好的地层序列之一.根据巢湖地区3条代表性下三叠统剖面的岩石地层、生物地层和碳同位素地层的最新研究成果归纳出本区早三叠世综合地层序列, 作为区域地层对比研究的标准.巢湖的下三叠统明确包含8个牙形石带和6个菊石带, 它们具有区域甚至全球对比意义; 巢湖地区早三叠世碳同位素δ¹³C_carb的演变呈现2个显著的漂移周期, 这种有特色的碳同位素漂移, 不仅具有地层学价值, 而且可能对于三叠纪初的生物复苏和生态系演变具有指导意义.在综合地层序列基础上, 将3条剖面的古地磁学研究成果链接, 形成了巢湖地区完整的早三叠世磁性地层序列, 包括5个主要的正向极性带和5个反向极性带, 这也是目前在本区乃至华南获得的最完整的早三叠世磁极性序列之一.这些为该区域乃至全球相关地层研究树立了一个基本格架.
- 下三叠统 /
- 生物地层 /
- 碳同位素地层 /
- 磁性地层 /
- 安徽巢湖
Abstract: One of the GSSP(Global Stratotype Section and Point)candidates for the Induan-Olenekian boundary is situated in Chaohu, central Anhui Province, southeast China. Chaohu also has a representative and well-expressed Lower Triassic sequence that has been better studied in various aspects. This paper presents an integrated and comprehensive Lower Triassic sequence of Chaohu to serve for a standard regional stratigraphical sequence, based upon up-to-date achievements in the studies of lithostratigraphy, biostratigraphy and carbon isotope stratigraphy at three sections in the area. Eight conodont zones and six ammonoid zones are consequently well distinguished in the Lower Triassic of Chaohu, and most of them are regionally or even globally correlative. The δ¹³C_carb excursion shows two characteristic shifting periods, and this carbon isotope sequence is not only of a stratigraphic value but also of great importance to understanding the biotic recovery and ecosystem reconstruction at the beginning of the Triassic. In the light of the integrated Lower Triassic sequence, a complete Lower Triassic magnetic stratigraphic sequence is established from the data at the three sections. The Lower Triassic covers five major normal polarity zones and five reversed polarity zones, and both the Permian-Triassic boundary and the Induan-Olenekian boundary are located inside normal polarity zones.
- Lower Triassic /
- biostratigraphy /
- carbon isotope stratigraphy /
- magnetostratigraphy /
- Chaohu

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图 1 安徽巢湖交通位置和研究区地质简图

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.平顶山西剖面; C.平顶山北剖面

Fig. 1. Traffic location and brief local geological map of Chaohu, Anhui Province

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图 2 安徽巢湖早三叠世地层剖面对比

Fig. 2. Correlation of the Lower Triassic stratigraphic sections in Chaohu, Anhui Province

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图 3 安徽巢湖地区早三叠世综合地层序列

CX.长兴阶; DL.大隆组; NP.平顶山北剖面; UP.上二叠统; N.正向极性带; R.反向极性带

Fig. 3. Integrated Lower Triassic sequence in Chaohu, Anhui Province

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