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4. On the Early Thermal History of Chondritic Asteroids Derived by 244-Plutonium Fission Track Thermometry

Published online by Cambridge University Press:  12 April 2016

P. Pellas  and
D. Storzer

Abstract

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Cooling curves were determined for ordinary chondrites within the time- and temperature intervals from ~4.6 to ~4.1 × 109 years and ~1400 K to 300 K respectively. This was done by analyzing the 244-plutonium fission track record in whitlockite and adjacent mineral track detectors. The resulting cooling rates constrain the sizes of the parent asteroids to ~120 - 200 km in radius. These dimensions together with the fact that chondrites had never been molten, suggest lower 26Al/27Al initial ratios for ordinary chondritic than for Allende refractory materials.

Type
Part VI. Primitive Meteorites
Information
International Astronomical Union Colloquium , Volume 39: Comets, Asteroids, Meteorites: Interrelations, Evolution and Origins , December 1977 , pp. 355 - 363
Copyright
Copyright © A.H. Delsemme 1977

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