%0 Journal Article
%T Sedimentolog¨ªa de unidades lo¨¦ssicas (Pleistoceno tard¨ªo - Holoceno) del centro-sur de Santa Fe
%A Kr£¿hling
%A Daniela
%A Orfeo
%A Oscar
%J Revista de la Asociaci£¿3n Argentina de Sedimentolog£¿-a
%D 2002
%I Scientific Electronic Library Online
%X an integral characterization of the outcropping loess-paleosols sequence in a type area of north pampa is presented, based on the stratigraphic analyses and the grain size and mineralogic variability. two loess profiles representative of interfluve areas of southern santa fe province were selected for detailed sedimentological analyses (tortugas and carcara£¿¨¢ profiles). the loessic cover is part of the quaternary aeolian sedimentary body of the argentine plain, defined as "pampean aeolian system" by iriondo (1990a) and iriondo and kr£¿hling (1995). both geomorphological and sedimentological systems compose the pampean aeolian system: a sand sea and a peripheral loess belt. the loess belt, about 2,000 km long and 250-300 km wide in north pampa, is located at the northeast of the sand sea. the sediments of the pampean aeolian system accumulated during the first stages of the last pleistocene glaciation; later on they were partially reworked during successive dry phases and underwent pedogenesis in humid periods (iriondo and kr£¿hling, 1995). the outcropping sedimentary sequence of the area is represented by fine aeolian units interbedded with buried soils. the tezanos pinto fm (iriondo, 1987) is the typical loessic unit of the north pampa. in most places (carcara£¿¨¢ profile) it lays in erosive contact on a dissipation deposit of aeolian sand (carcara£¿¨¢ fm; kr£¿hling, 1999a). the loess is a loose deposit, silt with subordinated clay and very fine sand, light brown in colour. the loess thickness generally ranges from 4 to 10 m in the interfluves. the loess is a homogeneous, massive and permeable deposit. the sedimentary mass is calcareous; it contains powdery concentrations and hard concretions of caco3. the loess body is crossed by fine rhizoid ramified canalicula and very fine micropores of tubular forms. it is stable in steep walls, in parts altered by subcutaneous subfussion and shaped by columnar disjunction. two members of the loess unit are differentiated in both pro
%K loess
%K pleistocene
%K holocene
%K grain size analyses
%K mineralogy
%K north pampa.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S1853-63602002000200003&lng=en&nrm=iso&tlng=en