A Critical Evaluation of the Evidence for Hot Accretion

Details A Critical Evaluation of the Evidence for Hot Accretion A Critical Evaluation of the Evidence for Hot Accretion

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996icar..124...86r&link_type=abstract

Icarus, Volume 124, Issue 1, pp. 86-96.

Computer Science

7

Scientific paper

Although the type-3 to -6 ordinary chondrite recrystallization sequence is attributed to prograde thermal metamorphism by most researchers, various studies have inferred support for the hot-accretion alternative on the basis of the composition and fine structure of pyroxene, the composition and texture of metallic Fe-Ni, misshapen chondrules, the texture of fine-grained silicate matrix material, the depletion of volatile trace elements in chondrite whole rocks, and natural remanent magnetization. Critical assessment of these studies shows that the arguments favoring hot accretion are based largely on inadequate data, flawed experiments, or improbable interpretations. The properties of ordinary chondrites are more readily understood in terms of prograde metamorphism of initially cold, unequilibrated type-3 material and episodes of brecciation, shock heating, and, in some cases, aqueous alteration.

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