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The Creston, California, meteorite fall and the origin of L chondrites

Jenniskens, Peter (författare)
SETI Institute, Carl Sagan Center, Mountain View, California, 94043 USA; NASA Ames Research Center, Moffett Field, California, 94035 USA
Utas, Jason (författare)
Institute of Geophysics and Planetary Physics, UCLA, Los Angeles, California, 90095 USA
Yin, Qing-Zhu (författare)
Department of Earth and Planetary Sciences, University of California at Davis, Davis, California, 95616 USA
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Matson, Robert D. (författare)
Leidos, Seal Beach, California, 90740 USA
Fries, Marc (författare)
Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, Texas, 77058 USA
Howell, Andreas (författare)
Spalding Allsky Camera Network, SkySentinel, LLC (SSL), Melbourne, Florida, 32940 USA
Free, Dwayne (författare)
Spalding Allsky Camera Network, SkySentinel, LLC (SSL), Melbourne, Florida, 32940 USA
Albers, Jim (författare)
SETI Institute, Carl Sagan Center, Mountain View, California, 94043 USA
Devillepoix, Hadrien (författare)
Faculty of Science & Engineering, Curtin University, Bentley, Perth, Western Australia, 6102 Australia
Bland, Phil (författare)
Faculty of Science & Engineering, Curtin University, Bentley, Perth, Western Australia, 6102 Australia
Miller, Aaron (författare)
Ancient Earth Trading Co., Atascadero, California, 93423 USA
Verish, Robert (författare)
Meteorite Recovery Lab, Escondido, California, 92046 USA
Garvie, Laurence A. J. (författare)
Center for Meteorite Studies, School of Earth & Space Exploration, Arizona State University, Tempe, Arizona, 85287 USA
Zolensky, Michael E. (författare)
Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, Texas, 77058 USA
Ziegler, Karen (författare)
Institute of Meteoritics, University of New Mexico, Albuquerque, New Mexico, 87131 USA
Sanborn, Matthew (författare)
Department of Earth and Planetary Sciences, University of California at Davis, Davis, California, 95616 USA
Verosub, Kenneth L. (författare)
Department of Earth and Planetary Sciences, University of California at Davis, Davis, California, 95616 USA
Rowland, Douglas J. (författare)
Center for Molecular and Genomic Imaging, Department of Biomedical Engineering, UC Davis, Davis, California, 95616 USA
Ostrowski, Daniel R. (författare)
NASA Ames Research Center, Moffett Field, California, 94035 USA; Bay Area Environmental Research Institute, 625 2nd St., Suite 209, Petaluma, California, 94952 USA
Bryson, Kathryn (författare)
NASA Ames Research Center, Moffett Field, California, 94035 USA; Bay Area Environmental Research Institute, 625 2nd St., Suite 209, Petaluma, California, 94952 USA
Laubenstein, Matthias (författare)
Ist. Naz. di Fiscia Nucleare, Lab. Naz. del Gran Sasso, I-67100 Assergi (AQ), Italy
Zhou, Qin (författare)
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012 China
Li, Qiu-Li (författare)
State Key Laboratory of Lithospheric Evolution, Inst. Geol. and Geophys., Chinese Acad. Sci., Beijing, 100029 China
Li, Xian-Hua (författare)
State Key Laboratory of Lithospheric Evolution, Inst. Geol. and Geophys., Chinese Acad. Sci., Beijing, 100029 China
Liu, Yu (författare)
State Key Laboratory of Lithospheric Evolution, Inst. Geol. and Geophys., Chinese Acad. Sci., Beijing, 100029 China
Tang, Guo-Qiang (författare)
State Key Laboratory of Lithospheric Evolution, Inst. Geol. and Geophys., Chinese Acad. Sci., Beijing, 100029 China
Welten, Kees (författare)
Space Sciences Laboratory, University of California, Berkeley, California, 94720 USA
Caffee, Marc W. (författare)
PRIME Laboratory, Purdue University, West Lafayette, Indiana, 47907 USA
Meier, Matthias M. M. (författare)
Institute of Geochemistry and Petrology, ETH Zürich, CH-8092 Zürich, Switzerland
Plant, Amy A. (författare)
Institute of Geochemistry and Petrology, ETH Zürich, CH-8092 Zürich, Switzerland
Maden, Colin (författare)
Institute of Geochemistry and Petrology, ETH Zürich, CH-8092 Zürich, Switzerland
Busemann, Henner (författare)
Institute of Geochemistry and Petrology, ETH Zürich, CH-8092 Zürich, Switzerland
Granvik, Mikael (författare)
Luleå tekniska universitet,Rymdteknik,University of Helsinki, Department of Physics, FI-00014 Helsinki, Finland
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 (creator_code:org_t)
2019-01-20
2019
Engelska.
Ingår i: Meteoritics and Planetary Science. - : John Wiley & Sons. - 1086-9379 .- 1945-5100. ; 54:4, s. 699-720
Relaterad länk:
https://escholarship...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • It has been proposed that all L chondrites resulted from an ongoing collisional cascade of fragments that originated from the formation of the ~500 Ma old asteroid family Gefion, located near the 5:2 mean‐motion resonance with Jupiter in the middle Main Belt. If so, L chondrite pre‐atmospheric orbits should be distributed as expected for that source region. Here, we present contradictory results from the orbit and collisional history of the October 24, 2015, L6 ordinary chondrite fall at Creston, CA (here reclassified to L5/6). Creston's short 1.30 ± 0.02 AU semimajor axis orbit would imply a long dynamical evolution if it originated from the middle Main Belt. Indeed, Creston has a high cosmic ray exposure age of 40–50 Ma. However, Creston's small meteoroid size and low 4.23 ± 0.07° inclination indicate a short dynamical lifetime against collisions. This suggests, instead, that Creston originated most likely in the inner asteroid belt and was delivered via the ν6 resonance. The U‐Pb systematics of Creston apatite reveals a Pb‐Pb age of 4,497.1 ± 3.7 Ma, and an upper intercept U‐Pb age of 4,496.7 ± 5.8 Ma (2σ), circa 70 Ma after formation of CAI, as found for other L chondrites. The K‐Ar (age ~4.3 Ga) and U,Th‐He (age ~1 Ga) chronometers were not reset at ~500 Ma, while the lower intercept U‐Pb age is poorly defined as 770 ± 320 Ma. So far, the three known L chondrites that impacted on orbits with semimajor axes a <2.0 AU all have high (>3 Ga) K‐Ar ages. This argues for a source of some of our L chondrites in the inner Main Belt. Not all L chondrites originate in a continuous population of Gefion family debris stretching across the 3:1 mean‐motion resonance.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

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