Kaprada L(5/6) chondrite: Chemistry, petrography, noble gases and nuclear tracks

Details Kaprada L(5/6) chondrite: Chemistry, petrography, noble gases and nuclear tracks Kaprada L(5/6) chondrite: Chemistry, petrography, noble gases and nuclear tracks

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009p%26ss...57.2048b&link_type=abstract

Planetary and Space Science, Volume 57, Issue 14-15, p. 2048-2052.

Computer Science

Scientific paper

A single stone weighing about 1.6 kg fell in Kaprada village of south Gujarat, India in October, 2004. It has been studied for mineralogy, petrography, chemical and isotopic composition and cosmogenic effects. The olivine is 23.7% fayalite. The petrography, bulk chemistry and oxygen isotopic composition indicate that it belongs to L(5/6) group of chondrites. The cosmic ray exposure age of the meteorite is estimated to be 11.4 Ma based on He, Ne and Ar isotopes. A trapped nitrogen amount of 0.25 ppm with δ15N=4.7±0.3‰ is typical of ordinary chondrites of higher metamorphic grade. The gas retention ages, based on U/Th-4He and K-40Ar are calculated to be 2.6 and 4.1 Ga, respectively. Cosmic ray track data indicate that the pre-atmospheric radius of the meteorite was about 7 cm, and about 75% mass was ablated during its journey through the Earth's atmosphere.

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