Mathematics – Logic
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2235h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 22, p. 2235-2238.
Mathematics
Logic
8
Chondrites, Chondrule, Metamorphism (Geology), Temperature Effects, Petrology, Solar System Evolution
Scientific paper
The thermal evolution of chondrules is investigated for the stages including primary heating through accretion to parent-body processing to determine whether the chondrules could be hot during accretion. Theoretical attention is given to whether chondrites of different petrologic types could have originated by means of hot accretion or metamorphic reheating. Data are presented from cooling-rate experiments and from calculations of heat retention required for the hot-accretion scenario. The accretion of chondrules hotter than 800 C is shown to be inconsistent with constraints on chondrule thermal evolution, in particular the slow cooling environment of chondrules vs the apparent cooling of chondrites in cold environments. It is argued that petrologic chondrites are formed by cold accretion and subsequently by metamorphic heating.
Haack Henning
Jeffrey Taylor G.
Keil Klaus
Scott Edward R. D.
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