Serpentinization of the martian crust during Noachian | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Serpentinization of the martian crust during Noachian

Publication Type:

Journal Article

Source:

Earth and Planetary Science Letters, Volume 277, Issue 1-2, p.184-193 (2009)

ISBN:

0012-821X

Accession Number:

WOS:000262812100021

URL:

http://www.sciencedirect.com/science/article/pii/S0012821X0800678X

Keywords:

UMR 7154 ; Géosciences marines ; Mars; serpentinization; dichotomy; magnetization; Noachian; early evolution; magnetite

Abstract:

This paper proposes a model of serpentinization of the Southern martian crust that may explain the topographic dichotomy, the absence of an associated free-air gravity anomaly and the presence of strong magnetic anomalies in the Southern Hemisphere. The thermodynamical conditions for serpentinization were likely met in the lithosphere during the Noachian period. This process may have decreased the density in the Southern crust and created the topographic dichotomy. Different reactions of serpentinization that can form magnetite have been considered. Assuming an intense magnetic field (core dynamo), we obtain chemical remanent magnetizations that are in the order of the estimates deduced from martian magnetic anomaly Studies. The pertinence and the implications of our model concerning the early thermal evolution of Mars are discussed, with emphasis on the intensity of the paleo-magnetic field. (c) 2008 Elsevier B.V. All rights reserved.