The Saricicek howardite fall in Turkey: Source crater of HED meteorites on Vesta and impact risk of Vestoids
Makaleler > Tam Makale · 2019
Yazarlar: Ozan ÜNSALAN, Peter Jenniskens, Qingzhu YIN, Ersin Kaygisiz, Jim ALBERS, David L. CLARK, Mikael Granvik, Iskender Demirkol, Ibrahim Y. Erdogan, Aydin S. Bengu, Mehmet E. Ozel, Zahide Terzioglu, Nayeob GI, Peter BROWN, Esref Yalcinkaya, Tugba Temel, Dinesh K. PRABHU, Darrel K. ROBERTSON, Mark BOSLOUGH, Daniel R. OSTROWSKI, Jamie KIMBERLEY, Selman Er, Douglas J. ROWLAND, Kathryn L. BRYSON, ÇİSEM ALTUNAYAR-UNSALAN, Bogdan RANGUELOV, Alexander KARAMANOV, Dragomir TATCHEV, Ozlem Kocahan, Michael Oshtrakh, Alevtina A. Maksimova, Maxim S. KARABANALOV, Kenneth L. VEROSUB, Emily LEVIN, Ibrahim Uysal, Viktor HOFFMANN, Takahiro Hiroi, Vishnu REDDY, Gulce O. Ildiz, Olcay Bolukbasi, Michael E. ZOLENSKY, Rupert HOCHLEITNER, Melanie KALIWODA, Sinan Ongen, Rui Fausto, Bernardo A. Nogueira, Andrey Chukin, Daniela KARASHANOVA, Vladimir A. SEMIONKIN, Mehmet Yesiltas, Timothy GLOTCH, Ayberk Yilmaz, Jon M. Friedrich, Matthew E. SANBORN, Magdalena HUYSKENS, Karen Ziegler, Curtis D. WILLIAMS, Maria SCHOENBAECHLER, Kerstin BAUER, Matthias M. M. MEIER, Colin MADEN, Henner BUSEMANN, Kees C. WELTEN, Marc W. CAFFEE, Matthias LAUBENSTEIN, Qin ZHOU, Qiu-Li LI, Xian-Hua LI, YU LIU, Guo-Qiang TANG, Derek W. G. SEARS, Hannah L. Mclain, Jason P. DWORKIN, Jamie E. ELSILA, Daniel P. GLAVIN, Philippe SCHMITT-KOPPLIN, Alexander RUF, Lucille LE CORRE, Nico SCHMEDEMANN
METEORITICS & PLANETARY SCIENCE, SCI Expanded İndekslerine Giren Dergi, Uluslararası, 2019, cilt 54, ss 953-1008
DOI: 10.1111/maps.13258
Özet
<p>The Saricicek howardite meteorite shower consisting of 343 documented stones<br /> occurred on September 2, 2015 in Turkey and is the first documented howardite fall.<br /> Cosmogenic isotopes show that Saricicek experienced a complex cosmic-ray exposure history,<br /> exposed during ~12–14 Ma in a regolith near the surface of a parent asteroid, and that an<br /> ~1 m sized meteoroid was launched by an impact 22 2 Ma ago to Earth (as did one-third<br /> of all HED meteorites). SIMS dating of zircon and baddeleyite yielded 4550.4 2.5 Ma and<br /> 4553 8.8 Ma crystallization ages for the basaltic magma clasts. The apatite U-Pb age of<br /> 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<br /> are interpreted to represent thermal metamorphic and impact-related resetting ages,<br /> respectively. Petrographic; geochemical; and O-, Cr-, and Ti-isotopic studies confirm that<br /> Saricicek belongs to the normal clan of HED meteorites. Petrographic observations and<br /> analysis of organic material indicate a small portion of carbonaceous chondrite material in<br /> the Saricicek regolith and organic contamination of the meteorite after a few days on soil.<br /> Video observations of the fall show an atmospheric entry at 17.3 0.8 km s<br /> 1 from NW;<br /> fragmentations at 37, 33, 31, and 27 km altitude; and provide a pre-atmospheric orbit that is<br /> the first dynamical link between the normal HED meteorite clan and the inner Main Belt.<br /> Spectral data indicate the similarity of Saricicek with the Vesta asteroid family (V-class)<br /> spectra, a group of asteroids stretching to delivery resonances, which includes (4) Vesta.<br /> Dynamical modeling of meteoroid delivery to Earth shows that the complete disruption of a<br /> ~1 km sized Vesta family asteroid or a ~10 km sized impact crater on Vesta is required to<br /> provide sufficient meteoroids ≤4 m in size to account for the influx of meteorites from this<br /> HED clan. The 16.7 km diameter Antionia impact crater on Vesta was formed on terrain of<br /> the same age as given by the 4He retention age of Saricicek. Lunar scaling for crater<br /> production to crater counts of its ejecta blanket show it was formed ~22 Ma ago.</p>