Early planetesimal melting from an age of 4.5662 Gyr for differentiated meteorites

Joel Baker (), Martin Bizzarro, Nadine Wittig, James Connelly and Henning Haack
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Joel Baker: Victoria University of Wellington
Martin Bizzarro: Geological Institute
Nadine Wittig: Geological Institute
James Connelly: The University of Texas at Austin
Henning Haack: Geological Museum

Nature, 2005, vol. 436, issue 7054, 1127-1131

Abstract: Angrites: early arrivals The latest ultra-precise measurement techniques have been used to obtain lead isotope ages for two examples of a rare type of meteorite, called basaltic angrites. These ‘differentiated’ meteorites are from parent bodies that were once molten and had solidified as a metal core and silicate mantle. Their absolute age is about 4.6 billion years, only a million years younger than the currently accepted minimum age of the Solar System. An excess of magnesium-26 in the angrite samples suggests that aluminium-26 decay triggered melting of the planetesimal that was the parent body.

Date: 2005
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DOI: 10.1038/nature03882

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