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Titolo:
Mantle convection and the dynamic geoid of Mars
Autore:
Harder, H;
Indirizzi:
Univ Gottingen, Inst Geophys, D-37075 Gottingen, Germany Univ Gottingen Gottingen Germany D-37075 hys, D-37075 Gottingen, Germany
Titolo Testata:
GEOPHYSICAL RESEARCH LETTERS
fascicolo: 3, volume: 27, anno: 2000,
pagine: 301 - 304
SICI:
0094-8276(20000201)27:3<301:MCATDG>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
MARTIAN MANTLE; PHASE-TRANSITIONS; 3-DIMENSIONAL MODELS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Harder, H Univ Gottingen, Inst Geophys, Herzberger Landstr 180, D-37075 Gottingen, Germany Univ Gottingen Herzberger Landstr 180 Gottingen Germany D-37075
Citazione:
H. Harder, "Mantle convection and the dynamic geoid of Mars", GEOPHYS R L, 27(3), 2000, pp. 301-304

Abstract

This study compares different 3D spherical models of thermal convection inthe Martian mantle. The best fit to the Tharsis bulge is obtained if the endothermic phase transition to perovskite occurs closely above the core-mantle boundary. In this case, a large-scale flow develops and the associated geoid anomaly explains approximately half of the observed long-wavelength geoid. The shallower exothermic phase transitions have little influence on the planform of the flow and on the shape of the geoid. Previous studies that included exothermic transitions were biased by effects of a soft lithosphere, which introduces a large-scale mantle flow even without a deep endothermic phase transition. However, such models predict a continous resurfacingand a dominant geoid low, which is in conflict with observations.

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Documento generato il 25/11/20 alle ore 07:30:01