欢迎访问现代地质！

现代地质 ›› 2006, Vol. 20 ›› Issue (3): 423-428.

• 地层学 • 上一篇    下一篇

新疆吐鲁番盆地陆相白垩纪与古近纪界线的环境指标

续晓璟1,2，昝立宏1,2，程捷1,2   

  1. 1中国地质大学 地质过程与矿产资源国家重点实验室，北京100083；
    2中国地质大学 岩石圈构造、深部过程及探测技术教育部重点实验室，北京100083)
  • 收稿日期:2005-12-09 修回日期:2006-05-10 出版日期:2006-03-20 发布日期:2006-03-20
  • 作者简介:程捷，男，教授，E-mail:chgj@cugb.edu.cn。
  • 基金资助:

    中国核工业总公司地质局项目(2-8-01-04)

Environmental Proxies from the Terrestrial Cretaceous-Paleogene Boundary in the Turpan Basin, Xinjiang

XU Xiao-jing1,2，ZAN Li-hong1,2，CHENG Jie1,2   

  1. 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China;
    2Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences,  Beijing100083, China
  • Received:2005-12-09 Revised:2006-05-10 Online:2006-03-20 Published:2006-03-20

PDF (PC)

2274

被引次数

7

摘要：

通过对新疆吐鲁番盆地白垩纪和古近纪陆相地层的氧化物、碳酸钙、有机碳含量分析以及有机碳稳定同位素的测试，并通过w(Fe3+)/w(Fe2+)比值指示的古温度研究，探讨了该地区白垩系—古近系界线的特征以及古气候特点。研究表明在白垩系/古近系界线附近各项环境指标发生了明显的变化。在白垩纪末期，有机碳同位素δ13Corg明显偏正，Al2O3、Fe2O3含量降低；而进入古新世，δ13Corg明显偏负，Al2O3、Fe2O3含量升高。对w(Fe3+)/w(Fe2+)比值指示的古温度计算表明，在白垩纪末期大气温度比较低，而进入古新世气温回升，这与进入古新世有机碳稳定同位素明显偏负的特征一致。

关键词: 白垩系/古近系, 界线, 有机碳, 同位素, 氧化物, 吐鲁番盆地, 新疆

Abstract:

On the basis of the oxide, calcium carbonate and organic carbon contents, and organic carbon stable isotope of the continental strata in the Turpan Basin, Xinjiang, together with the ratio of Fe3+/Fe2+, the Cretaceous/Paleogene boundary and paleoclimate during this period have been studied. Our studies have revealed that an apparent oscillation of all environmental proxies occurred near the boundary. At the terminal Cretaceous, δ13Corg increased significantly, organic carbon, calcium carbonate, SiO2 and Al2O3  contents decreased, while at the beginning of Paleocene, the increasing of SiO2 and Al2O3 contents was accompanied by the decreasing of δ13Corg. These changes actually reflected a cool event in the latest Cretaceous. Study of ratio of  Fe3+/Fe2+ further indicated that the temperature was low in the latest Cretaceous, which is consistent with the result derived from the organic carbon isotope.

Key words: Cretaceous/Paleogene, boundary, organic carbon, isotope, oxide, Turpan Basin, Xinjiang

中图分类号: 

京ICP备08011785号-7
地址：北京市海淀区学院路29号　邮编：100083
电话：010-82322463　 Email：xddz@cugb.edu.cn
技术支持：北京玛格泰克科技发展有限公司