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Early Archean spherule beds: Chromium isotopes confirm origin through multiple impacts of projectiles of carbonaceous chondrite type: Comment and Reply

Glikson, Andrew


Three Early Archean spherule beds from Barberton, South Africa, have anomalous Cr isotope compositions in addition to large Ir anomalies, confirming the presence of meteoritic material with a composition similar to that in carbonaceous chondrites. The extra-terrestrial components in beds S2, S3, and S4 are estimated to be ∼1%, 50%-60%, and 15%-30%, respectively. These beds are probably the distal, and possibly global, ejecta from major large-body impacts. These impacts were probably much larger...[Show more]

CollectionsANU Research Publications
Date published: 2003
Type: Journal article
Source: Geology
DOI: 10.1130/0091-7613(2003)031<0283:EASBCI>2.0.CO;2


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