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The Second Conference on the Lunar Highlands Crust and New Directions. Revised mineral and Mg# maps of the Moon from integrating results from the Lunar Prospector neutron and gamma-ray spectrometers with Clementine spectroscopy
-
Sarah T. Crites
und
Paul G. Lucey
Veröffentlicht/Copyright:
3. April 2015
Abstract
Mineralogical measurements from spectral remote sensing and remote geochemical measurements from gamma-ray and neutron spectrometers are complementary data sets that have been used together successfully to study the distributions of iron, titanium, and rare earth elements on the Moon. We compare neutron and gamma-ray data sets from Lunar Prospector and find them in good agreement with each other within the errors of previously developed equations that relate neutron flux with geochemistry, but find small adjustments to the nominal values are warranted. We used the neutron-validated LP GRS oxides to improve Clementine-based global mineral maps. The comparison was enabled by converting the minerals of Lucey (2004) to oxides using stoichiometry and assumptions about Mg#, calcium content of clinopyroxenes, and An#. We find that FeO and Al2O3 derived from the maps of Lucey (2004) do not follow the expected negative correlation seen in lunar samples, but can be brought into agreement with samples and with LP GRS oxides by increasing plagioclase in proportion with orthopyroxene abundance, while simultaneously decreasing Mg#. We interpreted this to mean that plagioclase and orthopyroxene exist in rocks together (as in a noritic rock) with the spectrally difficult to detect plagioclase being masked by the strong spectral signature of the orthopyroxene. We generated a revised set of maps of the major lunar minerals and a map of Mg# for the mafic minerals that are consistent with Lunar Prospector neutron and gamma-ray spectrometer results and show greatly improved agreement with lunar soil samples over previous global mineral maps from Clementine.
Keywords : Remote sensing; mineralogy; lunar magma ocean; neutron spectroscopy; gamma-ray spectroscopy; visible spectroscopy
Received: 2014-1-10
Accepted: 2014-9-30
Published Online: 2015-4-3
Published in Print: 2015-4-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Remote sensing;
mineralogy;
lunar magma ocean;
neutron spectroscopy;
gamma-ray spectroscopy;
visible spectroscopy
Artikel in diesem Heft
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- Highlights and Breakthroughs. Tweed, Twins, and Holes: A link between mineralogy and materials science
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- Crossroads in Earth and Planetary Materials. Block-by-block and layer-by-layer growth modes in coral skeletons
- Roebling Medal Paper. Toward theoretical mineralogy: A bond-topological approach
- Investigating Petrologic Indicators of Magmatic Processes in Volcanic Rocks. Petalite under pressure: Elastic behavior and phase stability
- Investigating Petrologic Indicators of Magmatic Processes in Volcanic Rocks. Pre-eruptive magma mixing and crystal transfer revealed by phenocryst and microlite compositions in basaltic andesite from the 2008 eruption of Kasatochi Island volcano
- What Lurks in the Martian Rocks and Soil? Investigations of Sulfates, Phosphates, and Perchlorates. Akaganéite and schwertmannite: Spectral properties and geochemical implications of their possible presence on Mars
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