Neutron activation studies on the Cretaceous—Tertiary boundary in Zhongba, Tibet

Zhifang Chai; Xueying Mao; Sulan Ma; Yiyin Sun; Jixiang Yin; Chengjie Liu; Daoyi Xu; Qingwen Zhang; Zhengzong Yang

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Neutron activation studies on the Cretaceous—Tertiary boundary in Zhongba, Tibet

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- Neutron activation studies on the Cretaceous—Tertiary boundary in Zhongba, Tibet
- Nuclear Techniques Vol. 07, Issue 6, (1984)
- 作者机构：
  
  1.中国科学院高能物理所
  2.中国科学院地质所
  3.国家地震局地质所
  4.地质矿产部地质科学院地质所
  5.中国科学院北京天文台
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：14 November 1983，
  
  Published：1984-06
- 稿件说明：
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Zhifang Chai, Xueying Mao, Sulan Ma, et al. Neutron activation studies on the Cretaceous—Tertiary boundary in Zhongba, Tibet[J]. Nuclear techniques, 1984, 07(6): 4-7,54,63.
DOI：

Zhifang Chai, Xueying Mao, Sulan Ma, et al. Neutron activation studies on the Cretaceous—Tertiary boundary in Zhongba, Tibet[J]. Nuclear techniques, 1984, 07(6): 4-7,54,63. DOI：

摘要

用中子活化法研究了取自西藏仲巴地区白垩系－第三系界线的一套岩石样品，初步实验结果表明，界线粘土层显示有高浓度的铱，本文从铱的浓度分布、在界面附近碳酸钙的含量变化以及稀土元素的丰度模式等方面，探讨了界线事件的原因，其中地外物质撞击是有吸引力的一个机制。

Abstract

A set of geological samples of Cretaceous—Tertiary section taken from Zhongba county

Tibet

was studied with neutron activation technique. The preliminary experimental results reveal that the high concentration of iridium exists in the clay layer at the C-T boundary. On the basis of the anomaly of Ir

variation of CaCO

contents and REE abundance patterns

possible mechanisms were examined

among which the impact of extraterrestrial substance on the earth is very attractive.

关键词

Keywords

references

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