Edafología. Volumen 7-3. Septiembre 2000. pág 143-150.

 

PLANETO-SECUENCIAS : EPISODIO II.

Papel clave del Fósforo en la génesis de los óxidos de hierro De los suelos de Marte.

 

Vidal. BARRÓN y José TORRENT

Departamento de Ciencias y Recursos Agrícolas y Forestales, Universidad de Córdoba, Apdo. 3048, 14080 Córdoba.

 

Abstract

The spectral and magnetic properties of Martian soils seem to be determined mainly by two iron oxides: hematite (a -Fe2O3) and a ferrimagnetic phase that is probably maghemite (g -Fe2O3). The latter generally forms by dehydroxylation of lepidocrocite (g -FeOOH); substantial amounts of lepidocrocite may thus have been formed in Mars. Our experiments suggest that the abundance of phosphorus in Martian rocks might be crucial in favouring the formation of lepidocrocite instead of goethite (a -FeOOH), the common polymorph in Earth. Moreover, the thermal transformation products of P-doped lepidocrocites show magnetic and spectral properties consistent with those of Martian soils

Key words: Mars soils, iron oxides, reflectance spectroscopy, magnetism.

 

 

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