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现代地质 ›› 2006, Vol. 20 ›› Issue (3): 409-412.

• 地层学 • 上一篇    下一篇

一条新发现的奥陶系—志留系界线剖面

苏文博1,王永标2,龚淑云3   

  1. 1中国地质大学 地球科学与资源学院,北京100083;2中国地质大学 地球科学学院,湖北 武汉430074;
    3广东省深圳市地质局,广东 深圳518031
  • 收稿日期:2006-05-02 修回日期:2006-06-10 出版日期:2006-03-20 发布日期:2006-03-20
  • 作者简介:苏文博,男,副教授,博士,1965年出生,古生物学及地层学专业,主要从事地层古生物学及沉积地质学的科研与教学工作。
  • 基金资助:

    国家自然科学基金项目(49802002,40372057); 国家科委攀登计划专项(SSER);中国科学院现代古生物学及地层学国家重点实验室项目(013101, 033101)

A New Ordovician-Silurian Boundary Section in Guizhou, South China

SU Wen-bo1, WANG Yong-biao2, GONG Shu-yun3   

  1. 1School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China;
    2Faculty of Earth Sciences, China University of Geosciences, Wuhan,Hubei430074, China;
    3Bureau of Geology of Shenzhen, Shenzhen, Guangdong518031, China
  • Received:2006-05-02 Revised:2006-06-10 Online:2006-03-20 Published:2006-03-20

摘要:

在贵州省桐梓县红花园乡南坝子村发现一条新的穿越奥陶系—志留系界线的地层剖面。该剖面自下而上依次出露有宝塔组、涧草沟组、五峰组和龙马溪组等,露头良好,产状平缓,化石丰富。其五峰组观音桥段顶部与龙马溪组交界处,即穿越奥陶系—志留系界线的一段地层,横向上可连续追索逾百米。自五峰组底部到龙马溪组底部(相当于Dicellograptus complanatus带—Coronograptus cyphus带下部)的地层中已发现25层斑脱岩。根据生物地层、层序地层等资料初步确认了这些斑脱岩与湖北宜昌等地的斑脱岩具高分辨对比性。该剖面的发现为华南奥陶系—志留系界线附近的各项研究提供了新的资料。

关键词: 界线剖面, 奥陶系, 志留系, 华南

Abstract:

Recently, a new Ordovician-Silurian boundary section has been discovered at Nanbazi village of the Honghuayuan Township, Tongzi County, Guizhou Province, South China. In this perfect section, the outcrop of the strata interval, which include the Baota Fm., the Jiancaogou Fm., and the Wufeng Fm., as well as the Longmaxi Fm., in ascending order, exposed pretty well with low dip direction of the beds and abundant of various fossils. The transition interval of the Ordovician-Silurian boundary, from the top of the Guanyinqiao Member of Wufeng Fm. through into the lowermost Longmaxi Fm., can be traced horizontaly about one hundred meters. Moreover, 25 layers of K-bentonite beds have been recognized from the Wufeng Fm. through into the lower part of Longmaxi Fm. With the studies of biostratigraphy and sequence stratigraphy, the present K-bentonite beds have been determined preliminarily that they can be correlated fairly well in high-resolution with those of in Yichang, Hubei Province and other areas. This new section will be a valuable clue for the relevant study focused on the Ordovician-Silurian boundary in South China.

Key words: boundary section, Ordovician, Silurian, South China

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