%0 Journal Article
%T Petrograf¨ªa y procedencia de areniscas terciarias en la Subcuenca de Hualf¨ªn, provincia de Catamarca, noroeste de Argentina
%A Muruaga
%A Claudia M
%J Revista de la Asociaci£¿3n Argentina de Sedimentolog£¿-a
%D 2001
%I Scientific Electronic Library Online
%X this paper documents the sandstone composition and provenance of the tertiary succession in a study area located at northwestern pampean ranges. the stratigraphic succession, in the southwestern part of the santa maria- hualfin basin (bossi et al. 1997), is about 3000 m thick (fig. 1). it is mainly formed of volcaniclastic fluvial sediments, belonging to the hualfin formation (lower cretaceous) and santa maria group (galv¨¢n y ruiz huidobro, 1965; bossi y palma, 1982; bossi et al., 1987, middle miocene to upper pliocene). this group is composed by four formations (from the base to the top): las arcas, chiquimil (divided in three members: los ba£¿os, el ¨¢spero y el jarillal), andalhuala and corral quemado. the crystalline basement is composed of low-grade metamorphic rocks (loma corral formation) intruded by the ortogneis of chango real formation. hualfin formation is composed of fine sandstones with few massive conglomerates lens and shales, with a high diagenetic grade. the tertiary sediments consist of sandstones with interbedded shales of las arcas formation and sandstones with interbedded conglomerate levels in los ba£¿os member of chiquimil formation. the regional volcanic event is mainly represented by 200m thick of volcaniclastic conglomerates belonging to el ¨¢spero member (bossi et al., 1987), which has andesitic lavas in its middle section. the proportion of the conglomerates increases steadily until they become dominant (corral quemado formation), in the upper part of the succession. the samples from two detail stratigraphic sections were studied: one close to the villavil village (3,500 m thick) and the other, toward the north side of el durazno range (2,300m thick). lacustrine and fluvial axial deposits in the villavil section represent distal facies assemblages. on the other hand, the stratigraphic section at the el durazno range shows proximal facies assemblages represented by alluvial fan deposits. the composition and petrography of 71 selected samples o
%K petrograf¨ªa sedimentaria
%K procedencia
%K areniscas
%K ne¨®geno.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S1853-63602001000200002&lng=en&nrm=iso&tlng=en