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《Geological Survey and Research》 2010-03
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Possible Impact at Precambrian-Cambrian Boundary and Its Influence on Biosphere

ZHANG Wei-jia1,2,Daniel P.Connelly3,YU Hang-jie4(1.Department of Physics,Peking University,Beijing 100871,China; 2.Committee of Yuanpei Honors Program,Peking University,Beijing 100871,China; 3.MAPCIS Research Centre,Millville,NJ 08331,U.S.A; 4.Department of Physics,Sun Yat-sen University,Zhuhai 510275,China)  
After a thorough research on the Earth's circumstantial changes and the great evolution of life in the Cambrian period,the authors propound such a hypothesis: During the Late Precambrian,about 500 ~ 600 Ma,a celestial body impacted the Earth.The high temperature ended the great glaciation,facilitated the communication of biological information.The rapid change of Earth environment enkindled the genesis-control system,and released the HSP-90 variations.After the impact,benefited from the protection of the new ozone layer and the energy supplement of the aerobic respiration,those survived underground life exploded.They generated carapaces and complex metabolism to adjust to the new circumstance of high temperature and high pressure.That's the Cambrian explosion.This article uses a large amount of analyses and calculations,and illustrates that this hypothesis fits well with most of the important incidences in astronomic and geologic discoveries.
【Key Words】: Cambrian Life evolution Milky Way spriral arms impact
【Fund】: 美国地质学会(Geological Society of American()No.20094815)
【CateGory Index】: Q911.1
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