Young chondrules in CB chondrites from a giant impact in the early Solar System

Alexander N. Krot (), Yuri Amelin, Patrick Cassen and Anders Meibom
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Alexander N. Krot: University of Hawai‘i at Manoa
Yuri Amelin: University of Toronto, and Geological Survey of Canada
Patrick Cassen: SETI Institute
Anders Meibom: Laboratoire d'Etude de la Matière Extraterrestre, USM 0205

Nature, 2005, vol. 436, issue 7053, 989-992

Abstract: Showing their age There has been a long-running debate about the origins of the eight (at last count) metal-rich meteorites called CB chondrites, named after Bencubbin in Australia where the first one was found in 1930. Their origins are important as an indication of the conditions prevailing in the early Solar System. New lead-207/lead-206 ages of chondrules (small round inclusions) in two CB chondrites are inconsistent with an origin in shockwave heating in the solar nebula, the usual source of chondrules in other chondritic meteorites. Instead they seem to have formed 5 million years later from material generated by collisions between planet-sized objects in the early Solar System.

Date: 2005
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DOI: 10.1038/nature03830

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