INGEIS 05370
INSTITUTO DE GEOCRONOLOGIA Y GEOLOGIA ISOTOPICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Composition of Mixed-Layered Illite/Smectite in a Continental Eocene Succession (Quebrada de los Colorados Formation, Salta Province, Argentina)
Autor/es:
DO CAMPO, MARGARITA; NIETO, F.; DEL PAPA, C.; HONGN, F.
Lugar:
Zaragoza
Reunión:
Congreso; Reunión anual de la Sociedad Española de Mineralogía-Sociedad Española de Arcillas; 2008
Institución organizadora:
Sociedad Española de Mineralogía
Resumen:
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Mixed layered illite/smectite (I/S) were identified by X ray diffraction
in continental sediments of the Quebrada de Los Colorados
Formation (Díaz and Malizzia, 1984), at the north end of CalchaquíValley in SaltaProvince, northwest Argentina. The
Quebrada de Los Colorados
Formation (Middle Eocene) is the basal unit of the Payogastilla Group and
consists of a 1500-m thick upward-thickening and upward-coarsening continental
succession composed by siltstones, sandstones and conglomerates. This unit was
deposited in fluvial and alluvial fan systems and constitutes the first filling
of the foreland basin linked with the shortening and uplift of the Central Andes. We have carried out a mineralogical study
of this unit, which comprises the analysis of more than 60 samples from Tin
Tin, Cº Bayo and Saladillo sites by X- ray diffraction (XRD) from bulk sample
and in the < 2 µm fraction with the aim to examine vertical and regional changes
in clay mineralogy (Do Campo et al., 2008). During this study we identified I/S
mixed layered minerals in several levels from the base of Saladillo site. At
this site three irregularly distributed sedimentary sequences were identified by
Hongn et al. (2007).
