Petrogenesis of lunar impact melt rock meteorite Oued Awlitis 001

Axel WITTMANN1, Randy L. KOROTEV2, Bradley L. JOLLIFF2, Kunihiko NISHIIZUMI3, A. J. Timothy JULL4, Marc W. CAFFEE5,6, Michael ZANETTI7, and Anthony J. IRVING8
Meteoritics & Planetary Science (in Press) Link to Article []
1Eyring Materials Center, Arizona State University, 901 S. Palm Walk, PSA 213, Tempe, Arizona 85287–1704, USA
2Department of Earth and Planetary Sciences and the McDonnell Center for the Space Sciences, Washington University inSt. Louis, One Brookings Drive, St. Louis, Missouri 63130, USA
3Space Sciences Laboratory, University of California Berkeley, Berkeley, California 94720–7450, USA
4Department of Geosciences, University of Arizona, 1040 East Fourth St., Tucson, Arizona 85721–0077, USA
5Department of Physics and Astronomy, Purdue University, 525 Northwestern Avenue, West Lafayette,Indiana 47907–2036, USA
6Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 525 Northwestern Avenue, West Lafayette,Indiana 47907–2036, USA
7Department of Earth Sciences, University of Western Ontario, 1151 Richmond Street N, London, Ontario N6A 5B7, Canada
8Department of Earth and Space Sciences, University of Washington, 4000 15thAvenue NE, Seattle, Washington 98195, USA
Published by arrangement with John Wiley & Sons

Oued Awlitis 001 is a highly feldspathic, moderately equilibrated, clast‐rich, poikilitic impact melt rock lunar meteorite that was recovered in 2014. Its poikilitic texture formed due to moderately slow cooling, which judging from textures of rocks in melt sheets of terrestrial impact structures, is observed in impact melt volumes at least 100 m thick. Such coherent impact melt volumes occur in lunar craters larger than ~50 km in diameter. The composition of Oued Awlitis 001 points toward a crustal origin distant from incompatible‐element‐rich regions. Comparison of the bulk composition of Oued Awlitis 001 with Lunar Prospector 5° γ‐ray spectrometer data indicates a limited region of matches on the lunar farside. After its initial formation in an impact crater larger than ~50 km in diameter, Oued Awlitis 001 was excavated from a depth greater than ~50 m. The cosmogenic nuclide inventory of Oued Awlitis 001 records ejection from the Moon 0.3 Ma ago from a depth of at least 4 m and little mass loss due to ablation during its passage through Earth’s atmosphere. The terrestrial residence time must have been very short, probably less than a few hundred years; its exact determination was precluded by a high concentration of solar cosmic ray‐produced 14C. If the impact that excavated Oued Awlitis 001 also launched it, this event likely produced an impact crater >10 km in diameter. Using petrologic constraints and Lunar Reconnaissance Orbiter Camera and Diviner data, we test Giordano Bruno and Pierazzo as possible launch craters for Oued Awlitis 001.


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