HR: 0800h
AN: GP21B-02    [Abstracts]
TI: Magnetic Pattern of Luvisol Sequences From Mexico and Russia: An Alternative Analysis of Soil Studies
AU: * Rivas Ortiz, J F
EM: jorger@geofisica.unam.mx
AF: Posgrado en ciencias de la Tierra, Instituto de Geofisica, UNAM, Ciudad Universitaria, 04510 Mexico D.F. Mexico Indicate at least one index term code and no more than five. Enter one index term Ciudad Universitaria, 04510 Mexico D.F. Mexico, Mexico, Df 04510, Mexico
AU: Ortega Guerrero, B
EM: bortega@geofisica.unam.mx
AF: Instituto de Geofisica, UNAM, Ciudad Universitaria, 04510 Mexico D.F. Mexico, Mexico, Df 04510, Mexico
AU: Solleiro Rebolledo, E
EM: solleiro@geologia.unam.mx
AF: Instituto de Geologia, UNAM, Ciudad Universitaria, 04510 Mexico D.F. Mexico, Mexico, Df 04510, Mexico
AU: Sedov, S
EM: sergey@geologia.unam.mx
AF: Instituto de Geologia, UNAM, Ciudad Universitaria, 04510 Mexico D.F. Mexico, Mexico, Df 04510, Mexico
AB: Recently, soil has been consolidated like a worthy and complementary source of information to environmental and paleo-climatic reconstruction research. The study of magnetic mineralogy present in soil horizons play an important role to understand a lot of complex process which to allow obtain information about environment condition present during genesis and evolution of soil. The main aim of this study is to compare soils with different parent material, as well as to obtain a magnetic sign from soils profile which could be used to determinate the responsible of pedogenic process of their magnetic behavior of each horizon, and their possible relationship with environmental condition. Study carried out of two complete profiles of buried interglacial Luvisols, one formed in loess in Russia (Alexandrovsky quarry, AQ) and the other in volcaniclastics in Mexico (Barranca Tlalpan, BT). In the AQ, the magnetic susceptibility is enhanced in the paleosol compared to parent material. In the BT sequence, susceptibility enhancement is absent in the soil profile. Increase of fine-grained magnetic components in the soil is attributed to neoformed minerals. However, this process cannot compensate for the loss of lithogenic magnetic minerals in any of the genetic horizons, and the resulting trend is susceptibility depletion in the whole soil profile. The pedogenic environment of eluvial horizons in both Luvisols is destructive to all magnetic components, both primary and secondary. Higher concentrations of antiferromagnetic components (hematite and goethite) found in E horizons are related to redoximorphic processes.
DE: 1512 Environmental magnetism
DE: 1519 Magnetic mineralogy and petrology
DE: 1540 Rock and mineral magnetism
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Joint Assembly