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The Origin of the Moon and Solar System

Published online by Cambridge University Press:  07 February 2017

Harold C. Urey
Harold C. Urey*
Affiliation:
University of California at San Diego, La Jolla, California, U.S.A.

Abstract

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The Rb87-Sr87 ages of many of the lunar rocks suggest that the fundamental differentiation took place 4.5 × 109 yr ago and that remelting occurred without exchange of the rubidium and strontium with the surroundings. The Apollo A rocks are an exception to this. They appear to have acquired rubidium without all of the Sr87 produced during the first aeon. Also in the remelting about half of the radiogenic leads were lost to the surroundings probably the soil by a vaporization process. We interpret these results to mean that remelting occurred in a system that was nearly closed to the surroundings and that the high early concentrations of radioactive elements in highly insulating surroundings made this possible.

Type
Part II: Scientific Papers
Information
Symposium - International Astronomical Union , Volume 47: The Moon , 1972 , pp. 429 - 440
Copyright
Copyright © Reidel 1972 

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