Evidence from the Semarkona ordinary chondrite for Al-26 heating of small planets

Details Evidence from the Semarkona ordinary chondrite for Al-26 heating of small planets Evidence from the Semarkona ordinary chondrite for Al-26 heating of small planets

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.337..238h&link_type=abstract

Nature (ISSN 0028-0836), vol. 337, Jan. 19, 1989, p. 238-241. Research supported by NASA.

Computer Science

69

Aluminum 26, Chondrites, Meteoritic Composition, Planetary Evolution, Planetary Temperature, Solar System, Magnesium Isotopes, Melting, Olivine, Photomicrographs, Pyroxenes, Radioactive Decay, Meteorites, Stony Meteorites, Ordinary Chondrites, Semarkona, Aluminum 26, Heating, Hypotheses, Radioactivity, Decay, Samples, Meteorite, Mineralogy, Cais, Solar Nebula, Magnesium 26, Radiogenic Elements, Refractory Material, Clasts, Abundance, Chondritic Material, Thermal Effects, Metamorphism, Planets, Size, Photomi

Scientific paper

The first observation of radiogenic Mg-26 in nonrefractory meteoritic material, a plagioclase-bearing, olivine-pyroxene clast chondrule in the Semarkona ordinary chondrite, is reported. The inferred initial abundance of Al-26 is sufficient to produce incipient melting in well-insulated bodies of chondritic composition. It is concluded that planetary accretion and diffentiation must have begun on a timescale comparable to the half-life of Al-26 and that, even if widespread melting did not occur, Al-26 heating played a significant role in thermal metamorphism on small planets.

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