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Geologic interpretation of the near-infrared images of the surface taken by the Venus Monitoring Camera, Venus Express

Basilevsky, A.T. and Shalygin, E.V. and Titov, D.V. and Markievicz, W.J. and Scholten, F. and Roatsch, T. and Kreslavsky, M.A. and Moroz, L.V. and Ignatiev, N.I. and Fiethe, B. and Osterloh, B. and Michalik, H. (2012) Geologic interpretation of the near-infrared images of the surface taken by the Venus Monitoring Camera, Venus Express. Icarus: International Journal of Solar System Studies, 217 (2), pp. 434-450. Elsevier. DOI: 10.1016/j.icarus.2011.11.003.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0019103511004222

Abstract

We analyze night-time near-infrared (NIR) thermal emission images of the Venus surface obtained with the 1-μm channel of the Venus Monitoring Camera onboard Venus Express. Comparison with the results of the Magellan radar survey and the model NIR images of the Beta-Phoebe region show that the night-time VMC images provide reliable information on spatial variations of the NIR surface emission. In this paper we consider if tessera terrain has the different NIR emissivity (and thus mineralogic composition) in comparison to the surrounding basaltic plains. This is done through the study of an area SW of Beta Regio where there is a massif of tessera terrain, Chimon-mana Tessera, surrounded by supposedly basaltic plains. Our analysis showed that 1-μm emissivity of tessera surface material is by 15–35% lower than that of relatively fresh supposedly basaltic lavas of plains and volcanic edifices. This is consistent with hypothesis that the tessera material is not basaltic, maybe felsic, that is in agreement with the results of analyses of VEX VIRTIS and Galileo NIMS data. If the felsic nature of venusian tesserae will be confirmed in further studies this may have important implications on geochemical environments in early history of Venus. We have found that the surface materials of plains in the study area are very variegated in their 1-μm emissivity, which probably reflects variability of degree of their chemical weathering. We have also found a possible decrease of the calculated emissivity at the top of Tuulikki Mons volcano which, if real, may be due to different (more felsic?) composition of volcanic products on the volcano summit.

Document Type:Article
Title:Geologic interpretation of the near-infrared images of the surface taken by the Venus Monitoring Camera, Venus Express
Authors:
AuthorsInstitution or Email of Authors
Basilevsky, A.T.Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS, Kosygin Str. 19, 119991 Moscow, Russia
Shalygin, E.V.Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Straße 2, 37191 Katlenburg-Lindau, Germany
Titov, D.V.ESA-ESTEC, SRE-SM Keplerlaan 1, PO Box 299, 2200 AG Noordwijk ZH, The Netherlands
Markievicz, W.J.Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Straße 2, 37191 Katlenburg-Lindau, Germany
Scholten, F.frank.scholten@dlr.de
Roatsch, T.thomas.roatsch@dlr.de
Kreslavsky, M.A.University of California, 1111 Franklin Str., Oakland, Santa Cruz, CA 94607, USA
Moroz, L.V.Institut für Planetologie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
Ignatiev, N.I.Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Straße 2, 37191 Katlenburg-Lindau, Germany
Fiethe, B.Institut für Datentechnik und Kommunikationsnetze (IDA), Technische Universität Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, Germany
Osterloh, B.Institut für Datentechnik und Kommunikationsnetze (IDA), Technische Universität Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, Germany
Michalik, H.Institut für Datentechnik und Kommunikationsnetze (IDA), Technische Universität Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, Germany
Date:February 2012
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:217
DOI:10.1016/j.icarus.2011.11.003
Page Range:pp. 434-450
Publisher:Elsevier
Status:Published
Keywords:Venus, Surface, Venus Express, VMC
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Venus Express Kamera (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Deposited By: Dipl.-Ing. Frank Scholten
Deposited On:10 Jan 2012 10:14
Last Modified:20 Mar 2013 19:45

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