摘要
古—中生代之交是显生宙以来最大的一次生物绝灭期 ,其形成机制一直是地学界长期探讨的热点课题之一。地史重大转折期是地球内、外各圈层长期作用下 ,各种量变达到阀值 ,加之可能的外因激化 ,在短时间内以连锁反应形式相继质变 ,形成了全球变化 (包括生物绝灭 )的地球突变期。文中从可能的外因 (外星体撞击事件 )及内因 (岩石圈的变化 ,地球表层的变化和生物圈的变化 )
The mass extinction across the Paleozoic Mesozoic transition is the biggest one during the Phanerozoic, and the mechanism of its formation has long been one of the topics for geologists. The global changes (including bio mass extinction) took place under the lasting actions of the inner and outer spheres of the Earth during the major transitional period in the geological history. At that time, all kinds of quantitative changes reached their changing points. With the intensification of some possible external causes, qualitative changes happened one after another like chain reaction in a very short time. This paper discusses the global changes and bio effects across the Paleozoic Mesozoic transition from both the possible external causes (such as extraterrestrial impact event) and the internal causes (such as changes of the lithosphere, the earth surface and the biosphere).
出处
《地学前缘》
EI
CAS
CSCD
2002年第3期85-93,共9页
Earth Science Frontiers
基金
国家自然科学基金资助项目 ( 4 0 172 0 12 )
中国地质调查局地层古生物中心项目 ( 2 0 0 113 90 0 0 72 )
湖北省自然科学基金重点项目 ( 2 0 0 1ABB177)
