Evidence for the late formation of hydrous asteroids from young meteoritic carbonates

Wataru Fujiya (), Naoji Sugiura, Hideyuki Hotta, Koji Ichimura and Yuji Sano
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Wataru Fujiya: Graduate School of Science, the University of Tokyo
Naoji Sugiura: Graduate School of Science, the University of Tokyo
Hideyuki Hotta: Graduate School of Science, the University of Tokyo
Koji Ichimura: Graduate School of Science, the University of Tokyo
Yuji Sano: Atmosphere and Ocean Research Institute, the University of Tokyo

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract The accretion of small bodies in the Solar System is a fundamental process that was followed by planet formation. Chronological information of meteorites can constrain when asteroids formed. Secondary carbonates show extremely old 53Mn–53Cr radiometric ages, indicating that some hydrous asteroids accreted rapidly. However, previous studies have failed to define accurate Mn/Cr ratios; hence, these old ages could be artefacts. Here we develop a new method for accurate Mn/Cr determination, and report a reliable age of 4,563.4+0.4/−0.5 million years ago for carbonates in carbonaceous chondrites. We find that these carbonates have identical ages, which are younger than those previously estimated. This result suggests the late onset of aqueous activities in the Solar System. The young carbonate age cannot be explained if the parent asteroid accreted within 3 million years after the birth of the Solar System. Thus, we conclude that hydrous asteroids accreted later than differentiated and metamorphosed asteroids.

Date: 2012
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DOI: 10.1038/ncomms1635

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