Emergence of the continents

Details Emergence of the continents Emergence of the continents

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978emco.book.....f&link_type=abstract

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Continents, Earth Crust, Evolution (Development), Earth (Planet), Geochronology, Histories, Oceans, Sea States, Topography

Scientific paper

If early degassing of the Earth produced a global ocean several km deep overlying a global sialic crust, then late heavy bombardment of that crust by basin forming impacting bodies would have produced topography such that by 4 billion years ago dry continential landmasses would stand above sea level. From extrapolation of lunar crater statistics, at least 50% of an original global crust on the earth would have been converted into basins averaging 4 km deep after isostatic adjustment. These basins formed the sink into which such a global ocean would drain. If the ocean was initially 2 km deep, then approximately 50% of the early Earth would have stood above sea level when the late heavy bombardment came to a close.

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