학술논문
The Sari\c{c}i\c{c}ek howardite fall in Turkey: Source crater of HED meteorites on Vesta and impact risk of Vestoids
Document Type
Working Paper
Author
Unsalan, Ozan; Jenniskens, Peter; Yin, Qing-Zhu; Kaygisiz, Ersin; Albers, Jim; Clark, David L.; Granvik, Mikael; Demirkol, Iskender; Erdogan, Ibrahim Y.; Bengu, Aydin S.; Özel, Mehmet E.; Terzioglu, Zahide; GI, Nayeob; Brown, Peter; Yalcinkaya, Esref; Temel, Tuğba; Prabhu, Dinesh K.; Robertson, Darrel K.; Boslough, Mark; Ostrowski, Daniel R.; Kimberley, Jamie; ER, Selman; Rowland, Douglas J.; Bryson, Kathryn L.; Altunayar-Unsalan, Cisem; Ranguelov, Bogdan; Karamanov, Alexander; Tatchev, Dragomir; Kocahan, Özlem; Oshtrakh, Michael I.; Maksimova, Alevtina A.; Karabanalov, Maxim S.; Verosub, Kenneth L.; Levin, Emily; Uysal, Ibrahim; Hoffmann, Viktor; Hiroi, Takahiro; Reddy, Vishnu; Ildiz, Gulce O.; Bolukbasi, Olcay; Zolensky, Michael E.; Hochleitner, Rupert; Kaliwoda, Melanie; Öngen, Sinan; Fausto, Rui; Nogueira, Bernardo A.; Chukin, Andrey V.; Karashanova, Daniela; Semionkin, Vladimir A.; Ş, Mehmet Ye Şilta; Glotch, Timothy; Yilmaz, Ayberk; Friedrich, Jon M.; Sanborn, Matthew E.; Huyskens, Magdalena; Ziegler, Karen; Williams, Curtis D.; Schönbächler, Maria; Bauer, Kerstin; Meier, Matthias M. M.; Maden, Colin; Busemann, Henner; Welten, Kees C.; Caffee, Marc W.; Laubenstein, Matthias; Zhou, Qin; Li, Qiu-Li; Li, Xian- Hua; Liu, Yu; Tang, Guo-Qiang; Sears, Derek W. G.; McLain, Hannah L.; Dworkin, Jason P.; Elsila, Jamie E.; Glavin, Daniel P.; Schmitt-Kopplin, Philippe; Ruf, Alexander; Corre, Lucille Le; Schmedemann, Nico
Source
Unsalan, Ozan, Peter Jenniskens,et al. "The Sari\c{c}i\c{c}ek howardite fall in Turkey: Source crater of HED meteorites on Vesta and impact risk of Vestoids." Meteoritics & Planetary Science 54, no. 5 (2019): 953-1008
Subject
Language
Abstract
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 documented howardite fall. Cosmogenic isotopes show that Sari\c{c}i\c{c}ek experienced a complex cosmic ray exposure history, exposed during ~12-14 Ma in a regolith near the surface of a parent asteroid, and that an ca.1 m sized meteoroid was launched by an impact 22 +/- 2 Ma ago to Earth (as did one third of all HED meteorites). SIMS dating of zircon and baddeleyite yielded 4550.4 +/- 2.5 Ma and 4553 +/- 8.8 Ma crystallization ages for the basaltic magma clasts. The apatite U-Pb age of 4525 +/- 17 Ma, K-Ar age of ~3.9 Ga, and the U,Th-He ages of 1.8 +/- 0.7 and 2.6 +/- 0.3 Ga are interpreted to represent thermal metamorphic and impact-related resetting ages, respectively. Petrographic, geochemical and O-, Cr- and Ti- isotopic studies confirm that Sari\c{c}i\c{c}ek belongs to the normal clan of HED meteorites. Petrographic observations and analysis of organic material indicate a small portion of carbonaceous chondrite material in the Sari\c{c}i\c{c}ek regolith and organic contamination of the meteorite after a few days on soil. Video observations of the fall show an atmospheric entry at 17.3 +/- 0.8 kms-1 from NW, fragmentations at 37, 33, 31 and 27 km altitude, and provide a pre-atmospheric orbit that is the first dynamical link between the normal HED meteorite clan and the inner Main Belt. Spectral data indicate the similarity of Sari\c{c}i\c{c}ek with the Vesta asteroid family spectra, a group of asteroids stretching to delivery resonances, which includes (4) Vesta. Dynamical modeling of meteoroid delivery to Earth shows that the disruption of a ca.1 km sized Vesta family asteroid or a ~10 km sized impact crater on Vesta is required to provide sufficient meteoroids <4 m in size to account for the influx of meteorites from this HED clan.