奥陶纪末期层序地层学研究

王传尚; 汪啸风; 陈孝红; 李志宏

奥陶纪末期层序地层学研究

中国地质调查局地层古生物研究中心，湖北宜昌 443003

基金项目:

中国地质调查局项目“中国古大陆环境变化及年代、生物、层序、事件、化学和构造地层响应” 200113900072

详细信息

作者简介:
王传尚(1969-), 男, 助理研究员, 2001年毕业于中国地质科学院(北京), 获硕士学位, 目前主要从事笔石和早古生代地层的研究.E-mail: ycwchuanshang@cgs.gov.cn

中图分类号: P534.42
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出版历程
- 收稿日期: 2002-04-05
- 刊出日期: 2003-01-25

Study of Sequence Stratigraphy at Terminal of Ordovician

Center for Stratigraphy and Paleontology, CGS, Yichang 443003, China

摘要

摘要: 为了适应高精度地层对比的需要, 特别是对相当于凝缩沉积的黑色笔石页岩相之间对比的需要, 在生物地层学研究的基础之上, 根据岩石和地球化学的综合研究, 在奥陶系/志留系界线附近共识别出3类层序界面: Ⅰ型界面、Ⅱ型界面和一个由δ (¹³ C) 的变化曲线识别出来的位于Tangyagrap tustypicus亚带之底的无沉积间断的层序界面.并据此将奥陶系五峰组划分为2个三级层序.而依据δ (Ce) 的变化规律, 又可以将上述2个三级层序进一步划分为5个四级层序(Psq1-Psq5), 从而提高了地层划分对比的精度
- 奥陶系末期 /
- 黑色页岩 /
- 层序 /
- 层序界面 /
- 四级层序
Abstract: In order to meet the need of high precision stratigraphic correlation, especially of the correlation of condense deposits the black graptolitic shale, three types of sequence boundary are recognized based on integrated studied of bio, litho and chemo Stratigraphy, i. e., the Ⅰtype, Ⅱ type sequence boundaries and a special one in continuous deposits at the base of Tangyagraptus typicus sub zone marked by δ (¹³ C) anomaly, which divided the Wufeng Formation. into two sequences-sq1 and sq2. The sq1 are formed by 3 parasequences, namely Psq1, Psq2 and Psq3, and the sq2 by another 2 parasequences, Psq4 and Psq5 based on the study of δ (Ce) anomaly. Consequently the precision of stratigraphic subdivision and correlation is improved.
- terminal of Ordovician /
- black shale /
- sequence /
- sequence boundary /
- parasequence

HTML全文

图 1 海平面升降变化对观音桥层的影响Fig.1 Impacts of sea level changes on sedimentation of Guanyinqiao bed

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图 2 峡东地区奥陶系五峰组层序地层的划分^[15]

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