Constraining the source regions of lunar meteorites using orbital geochemical data

Calzada-Diaz, A.; Joy, K. H.; Crawford, Ian; Nordheim, Tom

doi:10.1111/maps.12412

Cited by 41 publications

(55 citation statements)

References 95 publications

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“…Note that these three maria were also identified by Calzada‐Diaz et al. () as possible source areas for the lunar mingled meteorites comprised in the so‐called YAMM group.…”

Section: Discussionmentioning

confidence: 56%

High crustal diversity preserved in the lunar meteorite Mount DeWitt 12007 (Victoria Land, Antarctica)

Collareta

D’Orazio

Gemelli

et al. 2016

Meteorit & Planetary Scien

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The meteorite Mount DeWitt (DEW) 12007 is a polymict regolith breccia mainly consisting of glassy impact-melt breccia particles, gabbroic clasts, feldspathic clasts, impact and volcanic glass beads, basaltic clasts and mingled breccia clasts embedded in a matrix dominated by finegrained crystals; vesicular glassy veins and rare agglutinates are also present. Main minerals are plagioclase (typically An>85) and clinopyroxene (pigeonites and augites, sometimes interspersed). The presence of tranquillityite, coupled with the petrophysical data, the O-isotope data (D17O = -0.075) and the FeOtot/MnO ratios in olivine (91), pyroxene (65) and bulk rock (77) indicate a lunar origin for DEW 12007. Impactites consist of Al-rich impact melt splashes and plagioclase-rich meta-melt clasts. The volcanic products belong to the Very Low Titanium (VLT) or Low Titanium (LT) suites; an unusual subophitic fragment could be cryptomare-related. Gabbroic clasts could represent part of a shallow intrusion within a volcanic complex with prevailing VLT affinity. DEW 12007 has a mingled bulk composition with relatively high incompatible element abundances and shows a high crustal diversity, comprising clasts from the Moon's major terranes and rare lithologies. First order petrographic and chemical features suggest that DEW 12007 could be launch-paired with other meteorites including Y 793274/981031, QUE 94281, EET 87521/96008, and NWA 4884

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“…Note that these three maria were also identified by Calzada‐Diaz et al. () as possible source areas for the lunar mingled meteorites comprised in the so‐called YAMM group.…”

Section: Discussionmentioning

confidence: 56%

High crustal diversity preserved in the lunar meteorite Mount DeWitt 12007 (Victoria Land, Antarctica)

Collareta

D’Orazio

Gemelli

et al. 2016

Meteorit & Planetary Scien

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“…Dhofar 287 likely originated from Serenitatis or the mare areas from the near side of the Moon (Calzada‐Diaz et al. ). If Dhofar 280 indeed experienced an energetic impact event <1 Ga ago, it therefore may alternatively be derived from KREEP‐rich lunar frontside terrains, possibly associated with the 800 Ma old Copernicus crater (Stöffler et al.…”

Section: Resultsmentioning

confidence: 99%

Thermal and irradiation history of lunar meteorite Dhofar 280

Korochantseva

Buikin

Hopp

et al. 2016

Meteorit & Planetary Scien

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Dhofar 280 recorded a complex history on the Moon revealed by high‐resolution 40Ar‐39Ar dating. Thermal resetting occurred less than 1 Ga ago, and the rock was exposed to several impact events before and afterwards. The cosmic ray exposure (CRE) age spectrum indicates a 400 ± 40 Ma CRE on the lunar surface. A unique feature of this lunar sample is a partial loss of cosmogenic 38Ar, resulting in a (low‐temperature) CRE age plateau of about 1 Ma. This was likely caused by the same recent impact event that reset the (low‐temperature) 40Ar‐39Ar age spectrum and preceded the short transit phase to Earth of ≤1 Ma. Dhofar 280 may be derived from KREEP‐rich lunar frontside terrains, possibly associated with the Copernicus crater or with a recent impact event on the deposits of the South Pole–Aitken basin. Although Dhofar 280 is paired with Dhofar 081, their irradiation and thermal histories on the Moon were different. An important trapped Ar component in Dhofar 280 is “orphan” Ar with a low 40Ar/36Ar ratio. It is apparently a mixture of two components, one endmember with 40Ar/36Ar = 17.5 ± 0.2 and a second less well‐constrained endmember with 40Ar/36Ar ≤10. The presence of two endmembers of trapped Ar, their compositions, and the breccia ages seem to be incompatible with a previously suggested correlation between age or antiquity and the (40Ar/36Ar)trapped ratio (Eugster et al. 2001; Joy et al. 2011a). Alternatively, “orphan” Ar of this impact melt breccia may have an impact origin.

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“…Fe, Ti, and Th were taken directly from Calzada‐Diaz et al . [], and other major elements were taken from references therein. Minor/trace element averages were computed using data available on the Lunar Meteorite Compendium (available at http://curator.jsc.nasa.gov/antmet/lmc/).…”

Section: Creation Of the σA Mapmentioning

confidence: 99%

Geochemistry of the lunar highlands as revealed by measurements of thermal neutrons

2016

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Thermal neutron emissions from the lunar surface provide a direct measure of bulk elemental composition that can be used to constrain the chemical properties of near‐surface (depth <1 m) lunar materials. We present a new calibration of the Lunar Prospector thermal neutron map, providing a direct link between measured count rates and bulk elemental composition. The data are used to examine the chemical and mineralogical composition of the lunar surface, with an emphasis on constraining the plagioclase concentration across the highlands. We observe that the regions of lowest neutron absorption, which correspond to estimated plagioclase concentrations of >85%, are generally associated with large impact basins and are colocated with clusters of nearly pure plagioclase identified with spectral reflectance data.

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Constraining the source regions of lunar meteorites using orbital geochemical data

Cited by 41 publications

References 95 publications

High crustal diversity preserved in the lunar meteorite Mount DeWitt 12007 (Victoria Land, Antarctica)

High crustal diversity preserved in the lunar meteorite Mount DeWitt 12007 (Victoria Land, Antarctica)

Thermal and irradiation history of lunar meteorite Dhofar 280

Geochemistry of the lunar highlands as revealed by measurements of thermal neutrons

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