Title: Matching Martian crustal magnetization and magnetic properties of Martian meteorites

Author(s): Rochette P, Gattacceca J, Chevrier V, Hoffmann V, Lorand JP, Funaki M, Hochleitner R

Source: METEORITICS & PLANETARY SCIENCE 40 (4): 529-540 APR 2005

Document Type: Article

Language: English

Abstract: Magnetic properties of 26 (of 32) unpaired Martian meteorites (SNCs) are synthesized to further constrain the lithology carrying Martian magnetic crustal sources. Magnetic properties of ultramafic cumulates (i.e., Chassigny, Allan Hills [ALH] 84001) and lherzolitic shergottites (ALH 77005, Lewis Cliff [LEW] 88516) are one or two orders of magnitude too weak to account for the crustal magnetizations, assuming magnetization in an Earth-like field. Nakhlites and some basaltic shergottites, which are the most magnetic SNCs, show the right intensity. Titanomagnetite is the magnetic carrier in the nakhlites (7 meteorites), whereas in most basaltic shergottites (11 meteorites) it is pyrrhotite. Dhofar (Dho) 378, Los Angeles, and NWA 480/1460 and 2046 are anomalous basaltic shergottites, as their magnetism is mainly due to titanomagnetite.Pyrrhotite should be among the candidate minerals for the magnetized Noachian crust.

KeyWords Plus: SNC METEORITES; FIELD; PYRRHOTITE; ORIGIN; MARS; CHEMISTRY; PETROLOGY; ALH84001; ROCKS; TRANSITION

Addresses: Rochette P (reprint author), Univ Aix Marseille 3, CNRS, CEREGE, Aix En Provence, F-13628 France
Univ Aix Marseille 3, CNRS, CEREGE, Aix En Provence, F-13628 France
Univ Tubingen, Inst Geosci, Tubingen, D-72074 Germany
Museum Hist Nat, Dept Mineral, Paris, France
Natl Inst Polar Res, Itabashi Ku, Tokyo, 1738515 Japan
Mineral State Collect, Munich, D-80333 Germany

E-mail Addresses: rochette@cerege.fr

Publisher: METEORITICAL SOC, DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 USA

Subject Category: GEOCHEMISTRY & GEOPHYSICS

IDS Number: 947ZI