The Sari\c{c}i\c{c}ek howardite fall in Turkey: Source crater of HED meteorites on Vesta and impact risk of Vestoids
作者： Timothy Glotch , Nico Schmedemann , Jamie E. Elsila , Marc W. Caffee , Ozan Unsalan
DOI: 10.1111/MAPS.13258
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摘要: The Sari\c{c}i\c{c}ek howardite meteorite shower consisting of 343 documented stones occurred on 2 September 2015 in Turkey and is the first fall. Cosmogenic isotopes show that experienced a complex cosmic ray exposure history, exposed during ~12-14 Ma regolith near surface parent asteroid, an ca.1 m sized meteoroid was launched by impact 22 +/- ago to Earth (as did one third all HED meteorites). SIMS dating zircon baddeleyite yielded 4550.4 2.5 4553 8.8 crystallization ages for basaltic magma clasts. apatite U-Pb age 4525 17 Ma, K-Ar ~3.9 Ga, U,Th-He 1.8 0.7 2.6 0.3 Ga are interpreted represent thermal metamorphic impact-related resetting ages, respectively. Petrographic, geochemical O-, Cr- Ti- isotopic studies confirm belongs normal clan meteorites. Petrographic observations analysis organic material indicate small portion carbonaceous chondrite contamination after few days soil. Video fall atmospheric entry at 17.3 0.8 kms-1 from NW, fragmentations 37, 33, 31 27 km altitude, provide pre-atmospheric orbit dynamical link between inner Main Belt. Spectral data similarity with Vesta asteroid family spectra, group asteroids stretching delivery resonances, which includes (4) Vesta. Dynamical modeling shows disruption or ~10 crater required sufficient meteoroids <4 size account influx meteorites this clan.
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