陨击天文事件与新生代全球气候变化

全球范围内已确认的新生代陨击天文事件有8次,根据陨击直接证据或板块构造演化等推测的陨击事件至少还有3次,这些陨击天文事件都对应了新生代不同程度的气候变化。新生代全球气候变化的触发因素主要包括陨击天文事件、地球轨道参数变化、CO2浓度降低和全球碳循环变化、海洋及大气系统大量甲烷水合物释放、洋流变化及全球规模的构造运动（如构造隆升、超地幔柱、大规模火山活动）等,陨击天文事件是全球气候变化最主要的触发因素。

Meteorite-impact astronomical events and global climatic changes during the Cenezoic

There were at least eight meteorite-impact astronomical events confirmed during the Cenezoic. However there were still three or more meteorite-impact astronomical events,e. g.,55 Ma Palaeocene- Eocene thermal maximum,45 Ma Japanese Sea,and 41 Ma Drake Passage meteortite-impact events inferred from the direct evidences of meteorite impact or plate tectonic evolution during this period. All these meteorite-impact astronomical events may be related to the corresponding global climatic changes during the Cenezoic. The triggering factors for the global climatic changes during the Cenozoic include the meteorite-impact astronomical events,variations in the Earth’s orbital parameters,decrease of CO2concentrations and variations in global carbon cycling,release of plentiful methane hydrates in the oceanic and atmospheric systems,variations in oceanic currents and global-scale tectonic movements（ e. g.,tectonic uplift,super mantle plume,and wide-spread volcanic activities）,of which the meteorite-impact astronomical events are interpreted as the key triggering factors for the global climatic changes during the Cenezoic.