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| Titel |
Terrestrial analogues models based on MOURA magnetometer data. Application to Gusev crater and Apollinaris volcano |
| VerfasserIn |
Marina Díaz-Michelena, Miguel Felipe Cerdán, María Ramírez-Nicolás, Beatríz Sánchez-Cano, Marina Sánchez-Bayton, Rolf Kilian |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250098637
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| Publikation (Nr.) |
 EGU/EGU2014-14333.pdf |
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| Zusammenfassung |
| Sometimes it is a problem to determine whether a crater was formed by an explosive volcanic
event or a meteorite impact. This issue is of interest even on Earth where geological
features are often masked by erosion or vegetation and for the interpretation of
ancient craters on other planets or moons, where the geological context is not clearly
determined. Thus we propose a geophysical modelling approach to study the formation of
such craters with potential application to Mars, whose surface is fully covered with
craters. The evolution of this study might shed more light over the martian ancient
geodynamo.
The Earth provides many examples to develop models for the geological features of such
craters since it is feasible to perform magnetic and gravity surveys at different altitudes, and
therefore to have information on different surface scales. The models developed with real
satellite, airborne and on ground data on Earth (Moar, 2004) can be extrapolated to other
bodies, like Mars or the Moon, where only satellite and limited ground data are
available.
In the present study, surveys are mainly based on vector data from surveys with MOURA
magnetometer developed by INTA for Mars MetNet mission. Since the ambient conditions of
Mars are so extreme, MOURA is capable to withstand the extreme conditions of the
terrestrial analogues.
The models of craters are based on typical crater structures proposed by Lorenz (2003)
and Grieve (2006), where distinct susceptibilities and remanent magnetization have
been attributed to different volcanic or impact related rock units (bedded upper
diatreme facies and unbedded lower diatreme facies, tephra rims and ejecta blankets,
high pressures and temperature volumes, etc) and target rocks. The analysis of
the scalar magnetic potential and its harmonics can help in the interpretation of
the origin of these craters and their geological context by means of the magnetic
signature.
In this study, it will be presented the correlation between models and on Earth surveys
data. Furthermore, the Apollinaris volcano (Robinson, 1993) and the Gusev crater (Bertelsen,
2004) have been selected as the most appropriate edifices for the extrapolated analysis.
They both belong to the Noachian period which comprise the needed characteristics
described above. We aim to analyse if the magnetic measurements made on Earth
with MOURA at specific crater structures can be reproduced on Mars with our
model.
References
Moar, R. et al., “Manicouagan and baie du nord projects Manicouagan reservoir,
Quebec”; Technical Report, No. 733, 2004.
Lorenz V., “Maar–diatreme volcanoes, their formation and their setting in
hard-rock or soft-rock environments”; Geolines, 15, 72-83, 2003.
Grieve, R.A.F., “Impact Structures in Canada”; Geological Association of
Canada, 2006.
Robinson M. S et al., “Chronology, Eruption Duration, and Atmospheric
Contribution of the Martian Volcano Apollinaris Patera”, Icarus, Volume 104,
Issue 2, August 1993, Pages 301–323, 1993.
Bertelsen, P et al., “Magnetic properties experiments on the Mars exploration
rover Spirit at Gusev crater”, Science Volume: 305 Issue: 5685 Pages: 827-829
(doi: 10.1126/science.1100112), August 6th, 2004. |
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