First evidences of several pedo-sedimentary cycles in recent Quaternary sandy deposits in Los Llanos plains, La Rioja (Argentina)

MORRÁS H.; MORETTI L.; ALTINIER V.; FAVRET E.; BRESSAN E.; ROMERO A.

Mendoza

Congreso; 18th International Sedimentological Congress; 2011

In this work, three soil profiles developed on a sedimentary mantle of Quaternary sandy materials of a probably Upper Pleistocene-Holocene age were studied. The area studied is located at about 29°57´S and 65° 52´W, where two geomorphological units were differentiated: gently rolling low hills and concave areas associated with the drainage pathway; two of the profiles were described in the first unit and the other in the second unit. Several physical and chemical parameters were measured in samples from soil horizons of each profile; the mineralogical composition of the clay fraction and of bulk samples of each horizon was studied by X ray diffraction, and the bulk magnetic susceptibility of samples taken every ten centimeters depth was also measured.