Allogenic Impact Breccia Kamensk Impact Structure Age 49 Ma Rostov Russia Kamensk is an impact crater in Russia. It is 25 km (16 mi) in diameter and the age is estimated to be 49.0 ± 0.2 million years old (Eocene). The crater is not exposed at the surface.] It may have formed at the same time as the smaller nearby crater Gusev. References See Izett et al., 1994, LPI Contribution No. 825, p. 55-56 Six laser total-fusion analyses of the Kamensk impact glass have a weighted-mean age of 49.2 +/- 0.1 Ma relative to sanidine from the Taylor Creek Rhyolite of New Mexico that has an age of 27.92 Ma relative to a K-Ar age of 162.9± 0. Ma for a primary fluence-monitor standard SB-3 biotite or of 513.9 Ma for an international hornblende standard MMhb-1. This isotopic age of the Kamensk glass recalculated using a reference age for MMhb-1 of 520.4 Ma is 49.9 +/-0.1 Ma. ^ Kamensk. Earth Impact Database. University of New Brunswick. Retrieved 2009-08-19.
Posted on: Thu, 13 Nov 2014 22:54:47 +0000
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