Journal ArticleDOI
Pinpointing the Source of a Lunar Meteorite: Implications for the Evolution of the Moon
Edwin Gnos,Beda A. Hofmann,A. Al-Kathiri,Silvio Lorenzetti,Otto Eugster,Martin J. Whitehouse,Igor M. Villa,A. J. Timothy Jull,Jost Eikenberg,Bernhard Spettel,Urs Krähenbühl,Ian A. Franchi,Richard C. Greenwood +12 more
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TLDR
The isotope systematics of the meteorite record four lunar impact events at 3909 ± 13 million years ago, ∼2800 Ma, ∼200 Ma, and <0.34 Ma, which can be linked to the collision with Earth sometime after 9.7 ± 1.3 thousand years ago.Abstract:
The lunar meteorite Sayh al Uhaymir 169 consists of an impact melt breccia extremely enriched with potassium, rare earth elements, and phosphorus [thorium, 32.7 parts per million (ppm); uranium, 8.6 ppm; potassium oxide, 0.54 weight percent], and adherent regolith. The isotope systematics of the meteorite record four lunar impact events at 3909 ± 13 million years ago (Ma), ∼2800 Ma, ∼200 Ma, and <0.34 Ma, and collision with Earth sometime after 9.7 ± 1.3 thousand years ago. With these data, we can link the impact-melt breccia to Imbrium and pinpoint the source region of the meteorite to the Lalande impact crater.read more
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Journal ArticleDOI
The Constitution and Structure of the Lunar Interior
Mark A. Wieczorek,Bradley L. Jolliff,Amir Khan,Matthew E. Pritchard,Benjamin P. Weiss,James G. Williams,Lon L. Hood,Kevin Righter,Clive R. Neal,Charles K. Shearer,I. Stewart McCallum,Stephanie Tompkins,B. Ray Hawke,C. A. Peterson,Jeffrey J. Gillis,Ben Bussey +15 more
TL;DR: The current state of understanding of the lunar interior is the sum of nearly four decades of work and a range of exploration programs spanning that same time period as discussed by the authors, which is the framework that unifies our knowledge of the structure and composition of the Moon.
Journal ArticleDOI
Elemental composition of the lunar surface: Analysis of gamma ray spectroscopy data from Lunar Prospector
Thomas H. Prettyman,Justin J. Hagerty,R. C. Elphic,W. C. Feldman,David J. Lawrence,G. W. McKinney,David T. Vaniman +6 more
TL;DR: In this article, a linear spectral mixing is used to model the observed gamma ray spectrum for each map pixel and the spectral shape for each elemental constituent is determined by a Monte Carlo radiation transport calculation.
Journal ArticleDOI
Understanding the Lunar Surface and Space-Moon Interactions
Paul G. Lucey,Randy L. Korotev,Jeffrey J. Gillis,Lawrence A. Taylor,David J. Lawrence,Bruce A. Campbell,R. C. Elphic,Bill Feldman,Lon L. Hood,Donald M. Hunten,Michael Mendillo,Sarah K. Noble,James J. Papike,Robert C. Reedy,S. L. Lawson,Thomas H. Prettyman,Olivier Gasnault,Sylvestre Maurice +17 more
TL;DR: The surface of the Moon is a critical boundary that shapes our understanding of the entire Moon as a whole as discussed by the authors, and it is the lower boundary layer of the tenuous lunar atmosphere and constitutes both a source and a sink for atmospheric gases.
Journal ArticleDOI
Lunar geochemistry as told by lunar meteorites
TL;DR: The first one was found in 1979 in Antarctica as discussed by the authors, and about 36 lunar meteorites have been found in cold and hot deserts since the first one is found in 1980 in Antarctica, all are random samples ejected from unknown locations on the Moon by meteoroid impacts.
Journal ArticleDOI
The Late Heavy Bombardment
William F. Bottke,Marc D. Norman +1 more
TL;DR: In this paper, the authors show that the terrestrial planets were battered by an intense bombardment during their first billion years or more, but the timing, sources, and dynamical implications of these impacts are controversial.
References
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Journal ArticleDOI
A test for systematic errors in 40Ar/39Ar geochronology through comparison with U/Pb analysis of a 1.1-Ga rhyolite
TL;DR: In this paper, the decay constants of 40Ar/39Ar and 40K → 40Ar were compared with the results of the Palisade Rhyolite alkali feldspar.
Journal ArticleDOI
Major lunar crustal terranes: Surface expressions and crust‐mantle origins
TL;DR: In this paper, global geochemical information derived from Clementine multispectral data and Lunar Prospector gamma-ray data reveals at least three distinct provinces whose geochemistry and petrologic history make them geologically unique: (1) the Procellarum KREEP Terrane (PKT), (2) the Feldspathic High-lands terrane (FHT), and (3) the South Pole-Aitken Terane (SPAT).
Journal ArticleDOI
Oxygen Isotopes and the Moon-Forming Giant Impact
TL;DR: The three oxygen isotopes (Δ17O), 16O,17O, and 18O provide no evidence that isotopic heterogeneity on the Moon was created by lunar impacts, and are consistent with the Giant Impact model.
Book ChapterDOI
Stratigraphy and Isotope Ages of Lunar Geologic Units: Chronological Standard for the Inner Solar System
Dieter Stöffler,Graham Ryder +1 more
TL;DR: In this paper, the authors derived the ages of the multi-ring basins and their related ejecta blankets and presented alternative ages for the basin events (in parentheses): 3.92 ± 0.05 Gyr for Nectaris, 3.89 ± 0.02 Gyr (or 3.84 ± 0., 0.04 Gyr), 3.75 ± 0, 0.41 ± 0, 3.30 ± 0 and 3.15 ± 0).
Journal ArticleDOI
The “Procellarum KREEP Terrane”: Implications for mare volcanism and lunar evolution
TL;DR: In this article, the authors modeled the Moon's thermal evolution using a simple thermal conduction model and showed that as a result of the high abundance of heat-producing elements that are found in the Procellarum KREEP Terrane, partial melting of the underlying mantle is an inevitable outcome.