Volcanism on Mercury: Evidence from the first MESSENGER flyby for extrusive and explosive activity and the volcanic origin of plains
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چکیده
a Department of Geological Sciences, Brown University, Providence, RI 02912, USA b Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA c Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA d Southwest Research Institute, Boulder, CO 80302, USA e Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA f Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, USA g Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, HI 96822, USA
منابع مشابه
Volcanism on Mercury: evidence from the first MESSENGER flyby.
The origin of plains on Mercury, whether by volcanic flooding or impact ejecta ponding, has been controversial since the Mariner 10 flybys (1974-75). High-resolution images (down to 150 meters per pixel) obtained during the first MESSENGER flyby show evidence for volcanic vents around the Caloris basin inner margin and demonstrate that plains were emplaced sequentially inside and adjacent to nu...
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During its first two flybys of Mercury, the MESSENGER spacecraft acquired images confirming that pervasive volcanism occurred early in the planet's history. MESSENGER's third Mercury flyby revealed a 290-kilometer-diameter peak-ring impact basin, among the youngest basins yet seen, having an inner floor filled with spectrally distinct smooth plains. These plains are sparsely cratered, postdate ...
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Orbital observations by the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft are used to re-evaluate the nature and origin of the oldest mapped plains deposits on Mercury, the intercrater and intermediate plains units defined by Mariner 10 investigators. Despite the large areal extent of these plains, which comprise approximately one-third of the planetary su...
متن کاملIdentification of mercurian volcanism: Resolution effects and implications for MESSENGER
The possibility of volcanism on Mercury has been a topic of discussion since Mariner 10 returned images of half the planet's surface showing widespread plains material. These plains could be volcanic or lobate crater ejecta. An assessment of the mechanics of the ascent and eruption of magma shows that it is possible to have widespread volcanism, no volcanism on the surface whatsoever, or some r...
متن کاملGeology of the Caloris basin, Mercury: a view from MESSENGER.
The Caloris basin, the youngest known large impact basin on Mercury, is revealed in MESSENGER images to be modified by volcanism and deformation in a manner distinct from that of lunar impact basins. The morphology and spatial distribution of basin materials themselves closely match lunar counterparts. Evidence for a volcanic origin of the basin's interior plains includes embayed craters on the...
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تاریخ انتشار 2009