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| Titel |
Magnetic Anomalies Near Apollinaris Patera and the Medusae Fossae Formation, Mars |
| VerfasserIn |
L. Hood, B. Langlais |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250030726
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| Zusammenfassung |
| Mars Global Surveyor magnetometer measurements were obtained over limited areas during
the aerobraking phase of the mission at ~ 90 - 200 km altitude and globally during the
mapping phase at ~ 360 - 420 km altitude. A correlation of one martian crustal field anomaly
with a volcanic construct, Apollinaris Patera (A.P.), has previously been reported (Langlais,
B. and M. Purucker, Planet. Space Sci., v. 55, p. 270, 2007). Here, we report more detailed
mapping and modeling of the available MGS data over this construct and nearby
volcanic units along the hemispheric dichotomy boundary. A map of the magnetic
field magnitude at the mapping altitude contains a broad anomaly that correlates
approximately with a large-scale volcanic plateau that adjoins the A.P. construct
on its southwestern side. The volcanic plateau is mapped as part of the Medusae
Fossae Formation (Lucus Planum) and may consist of pyroclastic flow deposits up to
several km thick originating at one or more now-buried vents. Modeling of the A.P.
anomaly using a near-surface disk source indicates that the horizontal scale size of the
source is about twice as large as the surface diameter of the construct. Preliminary
modeling of the Lucus Planum anomaly is consistent with a broad (500 - 1000 km)
near-surface source although sources consisting of a series of deeply buried magma
chambers cannot be excluded. Possible implications for martian dynamo history will be
discussed. |
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