摘要
阐述了在白垩系与第三系界线上的几个最主要的异常现象的地质记录，并就冲击论和火山论对这些异常现象进行不同的解释和概要的综述。认为Ｋ—Ｒ界线地质记录中诸多的异常现象主要由地外撞击引发的巨大灾变而造成，而火山作用，微生物作用以及环境渐变的累积效应也不可忽略。
In this review, the controversial issue is summarized on the abnormal sedimentation at the time of the K-R boundary,and our tentative brief appraise is given to the different explanations of the impact and the volcanism for the anomalies at K-R boundary.Conclusively, it is suggested that many anomalies in geological records at K-R boundary is caused mainly by extraterrestrial impact.In addition, volcanism, microbial activity, combined with accumulation effect of gradually environmental change are also very important causes.
出处
《桂林工学院学报》
1995年第1期23-33,共11页
Journal of Guilin University of Technology
基金
国家自然科学基金
关键词
白垩纪
第三纪
灭绝事件
铱异常
冲击石英
地层
Cretaceous-Tertiary, extinction event
Ir anomaly
microspherolite
shock quartz
