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The Major-Element Composition of Mercury's Surface from MESSENGER X-ray Spectrometry

by Ebel, Denton S. , McNutt, Ralph L. , Schlemm, Charles E. , Weider, Shoshana Z. , McCoy, Timothy J. , Goldsten, John O. , Lawrence, David J. , Sprague, Ann L. , Solomon, Sean C. , Evans, Larry G. , Hamara, David K. , Nittler, Larry R. , Ernst, Carolyn M. , Boynton, William V. , Starr, Richard D.

in Abundance / Aluminum / Astronomy / calcium / Chemical composition / Chemical elements / dust / Earth / Earth, ocean, space / Equator / Exact sciences and technology / fluorescence emission spectroscopy / Iron / Lava / Lava flows / magnesium / Magnetic fields / Materials / Mercury / Mercury surface / oxides / Planetary composition / Planetary surfaces / Planetary, asteroid, and satellite characteristics and properties / Planetology / Planets / Planets, their satellites and rings. Asteroids / Proposals / reflectance / Silicates / Silicon / Solar flares / Solar system / Spacecraft / Spectrometry / Spectrum analysis / Sulfur / Surface features, cratering, and topography / Terrestrial planets / X-radiation / X-ray fluorescence / X-rays

2011

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The Major-Element Composition of Mercury's Surface from MESSENGER X-ray Spectrometry

2011

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The Major-Element Composition of Mercury's Surface from MESSENGER X-ray Spectrometry

2011

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Journal Article

The Major-Element Composition of Mercury's Surface from MESSENGER X-ray Spectrometry

Ebel, Denton S.,

McNutt, Ralph L.,

Schlemm, Charles E.,

Weider, Shoshana Z.,

McCoy, Timothy J.,

Goldsten, John O.,

Lawrence, David J.,

Sprague, Ann L.,

Solomon, Sean C.,

Evans, Larry G.,

Hamara, David K.,

Nittler, Larry R.,

Ernst, Carolyn M.,

Boynton, William V.,

Starr, Richard D.

2011

Overview

X-ray fluorescence spectra obtained by the MESSENGER spacecraft orbiting Mercury indicate that the planet's surface differs in composition from those of other terrestrial planets. Relatively high Mg/Si and low Al/Si and Ca/Si ratios rule out a lunarlike feldspar-rich crust. The sulfur abundance is at least 10 times higher than that of the silicate portion of Earth or the Moon, and this observation, together with a low surface Fe abundance, supports the view that Mercury formed from highly reduced precursor materials, perhaps akin to enstatite chondrite meteorites or anhydrous cometary dust particles. Low Fe and Ti abundances do not support the proposal that opaque oxides of these elements contribute substantially to Mercury's low and variable surface reflectance.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science

Subject

Abundance

/ Aluminum

/ Astronomy

/ calcium

/ Chemical composition

/ Chemical elements

/ dust