Mineralogical changes during thermal demagnetization of natural continental sandstones

We study the mineralogical changes suffered by specimens of natural miocene red and green continental sandstones (from Pozuelos Formation and Tiomayo Formation) cropping out in the Argentine Puna that increase their bulk magnetic susceptibility and change color when thermally treated. We hypothesize...

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Autores principales: Prezzi, Claudia Beatriz, Somoza, Rubén, Mercader, Roberto Carlos
Formato: Articulo
Lenguaje:Inglés
Publicado: 2005
Materias:
Geofísica
Siderite
cement
Transformation
Magnetite
Maghemite
Hematite
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/138735
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-138735
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geofísica
Siderite
cement
Transformation
Magnetite
Maghemite
Hematite
spellingShingle Geofísica
Siderite
cement
Transformation
Magnetite
Maghemite
Hematite
Prezzi, Claudia Beatriz
Somoza, Rubén
Mercader, Roberto Carlos
Mineralogical changes during thermal demagnetization of natural continental sandstones
topic_facet Geofísica
Siderite
cement
Transformation
Magnetite
Maghemite
Hematite
description We study the mineralogical changes suffered by specimens of natural miocene red and green continental sandstones (from Pozuelos Formation and Tiomayo Formation) cropping out in the Argentine Puna that increase their bulk magnetic susceptibility and change color when thermally treated. We hypothesize that on heating siderite, which is present in small quantities as cement in the studied sandstones, would oxidize and decompose into maghemite and/or magnetite. Subsequent heating to higher temperatures sometimes would bring about the conversion of maghemite and/or magnetite to hematite. Mossbauer spectroscopy proved to be a very valuable tool for the determination of the presence of siderite in small amounts in the studied samples. The present results show that further work is needed in order to fully understand the mineralogical changes suffered by continental sandstones during heating. The characterization of such changes occurred during laboratory routines is relevant, since they can help to better understand natural processes.
format Articulo
Articulo
author Prezzi, Claudia Beatriz
Somoza, Rubén
Mercader, Roberto Carlos
author_facet Prezzi, Claudia Beatriz
Somoza, Rubén
Mercader, Roberto Carlos
author_sort Prezzi, Claudia Beatriz
title Mineralogical changes during thermal demagnetization of natural continental sandstones
title_short Mineralogical changes during thermal demagnetization of natural continental sandstones
title_full Mineralogical changes during thermal demagnetization of natural continental sandstones
title_fullStr Mineralogical changes during thermal demagnetization of natural continental sandstones
title_full_unstemmed Mineralogical changes during thermal demagnetization of natural continental sandstones
title_sort mineralogical changes during thermal demagnetization of natural continental sandstones
publishDate 2005
url http://sedici.unlp.edu.ar/handle/10915/138735
work_keys_str_mv AT prezziclaudiabeatriz mineralogicalchangesduringthermaldemagnetizationofnaturalcontinentalsandstones
AT somozaruben mineralogicalchangesduringthermaldemagnetizationofnaturalcontinentalsandstones
AT mercaderrobertocarlos mineralogicalchangesduringthermaldemagnetizationofnaturalcontinentalsandstones
bdutipo_str Repositorios
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