Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...15..545a&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,
Physics
4
Atmospheric Moisture, Earth Atmosphere, Geotemperature, Primitive Earth Atmosphere, Protoplanets, Atmospheric Temperature, Impact, Magma, Surface Temperature, Temperature Profiles, Thermal Conductivity
Scientific paper
During accretion of the earth by planetesimal impacts, shock degassing of volatile materials occurs, and a proto-atmosphere is formed. Once such an impact-generated atmosphere is formed, the surface temperature of the earth growing by planetesimal impact increases due to the blanketing effect of the atmosphere. It is shown that the surface of the accreting earth was covered entirely by a 'magma ocean'. This suggests that the differentiation of the earth proceeds under very low pressure and high temperature conditions during its accretion stage. This places a severe constraint on the amount of volatiles in the mantle, and the formation time of the atmosphere and ocean of the earth.
Abe Yasuhiro
Matsui Takafumi
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