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Z .Chemical Geology 169 2000 6982 www.elsevier.comrlocaterchemgeo

Summary: Z .Chemical Geology 169 2000 69­82
Accretion of Moon and Earth and the emergence of life
G. Arrhenius a,)
, A. Lepland a,b
Scripps Institution of Oceanography, UniÕersity of California, La Jolla, San Diego, CA 92093-0220, USA
Institute of Geology, Tallinn Technical UniÕersity, EE-0001 Tallinn, Estonia
Received 18 March 1999; accepted 9 June 2000
The discrepancy between the impact records on the Earth and Moon in the time period, 4.0­3.5 Ga calls for a
re-evaluation of the cause and localization of the late lunar bombardment. As one possible explanation, we propose that the
time coverage in the ancient rock record is sufficiently fragmentary, so that the effects of giant, sterilizing impacts
throughout the inner solar system, caused by marauding asteroids, could have escaped detection in terrestrial and Martian
Alternatively, the lunar impact record may reflect collisions of the receding Moon with a series of small, original
satellites of the Earth and their debris in the time period about 4.0­3.5 Ga. The effects on Earth of such encounters could
have been comparatively small. The location of these tellurian moonlets has been estimated to have been in the region
around 40 Earth radii. Calculations presented here, indicate that this is the region that the Moon would traverse at 4.0­3.5


Source: Arrhenius, Gustaf - Integrative Oceanography Division, Scripps Institution of Oceanography


Collections: Environmental Sciences and Ecology; Geosciences; Biology and Medicine