Physico-chemical processes in the solar nebula, as inferred from meteorites.Many properties of meteorites suggest that they formed in a cooling solar nebula. Chemical differences among chondrites, encompassing nearly all known elements, can be accounted for by as few as 4 processes: loss of an early condensate (above 1300 K), loss of nickel-iron (1050 to 700 K), partial remelting of the condensate (600 to 450 K), and accretion (500 to 360 K). The same processes seem to have affected the inner planets. Reasonably concordant accretion temperatures are obtained by various cosmothermometers. These accretion temperatures are 3 times higher than present black-body temperatures in the asteroid belt, suggesting that accretion took place only during a high-temperature stage of necessarily short duration.
Document ID
19730049612
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Anders, E. (Chicago, University Chicago, Ill., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1972
Subject Category
Space Sciences
Meeting Information
Meeting: Symposium on The origin of the solar system