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Mercury's Surface Composition and Character as Measured by Ground-Based Observations

Sprague, A. und Warell, J. und Cremonese, G. und Langevin, Y. und Helbert, J. und Wurz, P. und Veselovsky, I. und Orsini, S. und Milillo, A. (2006) Mercury's Surface Composition and Character as Measured by Ground-Based Observations. Space Science Reviews, 132 (2-4), Seiten 399-431. Springer. DOI: 10.1007/s11214-007-9221-3. ISSN 1572-9672.

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Kurzfassung

Mercury’s surface is thought to be covered with highly space-weathered silicate material. The regolith is composed of material accumulated during the time of planetary formation, and subsequently from comets, meteorites, and the Sun. Ground-based observations indicate a heterogeneous surface composition with SiO<sub>2</sub> content ranging from 39 to 57 wt%. Visible and near-infrared spectra, multi-spectral imaging, and modeling indicate expanses of feldspathic, well-comminuted surface with some smooth regions that are likely to be magmatic in origin with many widely distributed crystalline impact ejecta rays and blocky deposits. Pyroxene spectral signatures have been recorded at four locations. Although highly space weathered, there is little evidence for the conversion of FeO to nanophase metallic iron particles (npFe0), or “iron blebs,” as at the Moon. Near- and mid-infrared spectroscopy indicate clino- and ortho-pyroxene are present at different locations. There is some evidence for no- or low-iron alkali basalts and feldspathoids. All evidence, including microwave studies, point to a low iron and low titanium surface. There may be a link between the surface and the exosphere that may be diagnostic of the true crustal composition of Mercury. A structural global dichotomy exists with a huge basin on the side not imaged by Mariner 10. This paper briefly describes the implications for this dichotomy on the magnetic field and the 3 : 2 spin : orbit coupling. All other points made above are detailed here with an account of the observations, the analysis of the observations, and theoretical modeling, where appropriate, that supports the stated conclusions.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen:bisher nur Online-Veröffentlichung
Titel:Mercury's Surface Composition and Character as Measured by Ground-Based Observations
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Sprague, A.Lunar and Planetary Laboratory, University of Arizona
Warell, J.Department of Astronomy and Space Physics, Uppsala University
Cremonese, G.INAF-Osservatorio Astronomico
Langevin, Y.Institut d’Astrophysique Spatiale, CNRS/Univ. Paris XI
Helbert, J.NICHT SPEZIFIZIERT
Wurz, P.Physics Institute, University of Bern
Veselovsky, I.Skobeltsyn Institute of Nuclear Physics, Moscow State University; Space Research Institute (IKI), Russian Academy of Sciences
Orsini, S.Istituto Nazionale di Astrofisica (INAF); , Istituto di Fisica dello Spazio Interplanetario (IFSI)
Milillo, A.Istituto Nazionale di Astrofisica (INAF); , Istituto di Fisica dello Spazio Interplanetario (IFSI)
Datum:2006
Erschienen in:Space Science Reviews
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:132
DOI :10.1007/s11214-007-9221-3
Seitenbereich:Seiten 399-431
Verlag:Springer
ISSN:1572-9672
Status:veröffentlicht
Stichwörter:Mercury, Planetary surface composition, Remote sensing, Ground-based observations, Spectroscopy
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Vergleichende Planetologie (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetenphysik
Hinterlegt von: Stefanie Musiol
Hinterlegt am:14 Jan 2008
Letzte Änderung:15 Jan 2010 01:57

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