The Orbit and Exposure History of the Piplia Kalan Eucrite

Details The Orbit and Exposure History of the Piplia Kalan Eucrite The Orbit and Exposure History of the Piplia Kalan Eucrite

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..455b&link_type=abstract

Meteoritics & Planetary Science, vol. 33, no. 2, pages 455-461.

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Scientific paper

Cosmogenic radionuclides, particle tracks and rare gases have been measured in the two fragments of the Piplia Kalan eucrite which fell in Rajasthan, India on 20th June 1996. The cosmic ray exposure age of the meteorite is calculated to be 23 Ma, similar to ages of some other eucrites. The track density in feldspars and pyroxenes varies between 0.2x106 to ~ 4.5x106.cm-2. The mass ablation of the meteorite, based on the distribution of track density in near surface samples of the two fragments, is calculated to be about 75%, corresponding to an entry velocity of about 17 km/s. The orbital parameters of the eucrite have been computed from the radiant of the meteor trail and the geocentric velocity. The best estimates are a=2.47 AU, e=0.62 and i=7.54o, similar to the orbital elements of other meteorites, most of which have been inferred to originate within 2.6 AU of the Sun. The activity of the radionuclide 26Al agrees with the expected production rate whereas the shortlived radionuclides 22Na, 54Mn, 46Sc etc. have levels consistent with the galactic cosmic ray fluxes expected during the solar minimum period before the time of fall. All the cosmogenic effects, i.e. radio- and stable- nuclides and particle tracks are consistent with the meteoroid having had a simple, one stage exposure history in the interplanetary space. Lower radiogenic ages of U, Th-He (0.7 Ga) and K-Ar (3.6 Ga) indicate severe losses of 4He and 40Ar, as observed in most eucrites. A Pu-Xe age, concordant with ADOR, shows that Piplia belongs to the "old" eucrite group.

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