CADIC   02618
CENTRO AUSTRAL DE INVESTIGACIONES CIENTIFICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Megaflutes y eskers en Lago Viedma, Provincia de Santa Cruz
Autor/es:
DÍAZ BALOCCHI, L.; PONCE, J.F.; GONZÁLEZ GUILLOT, M.
Lugar:
San Miguel de Tucumán
Reunión:
Congreso; XX Congreso Geológico Argentino; 2017
Institución organizadora:
Asociación Geológica Argentina
Resumen:
Two megaflute fields and an esker group has been identified at lago Viedma (49º 41? S, 72º 17? W). In this paper, their geomorphological and sedimentological characteristics are identified and described. One of the megaflute field is located to the east of lago Viedma, and is composed of 34 megaflutes and 12 drumlins. This subglacial landform field is part of the Post-GGP 1 ground moraines, and could have been generated when the Viedma Paleoglacier abandoned the valley where it was confined and expanded, extending eastwards as a piedmont glacier, probably in pre-LGM glacial advance. The second megaflute field is located along the southern margin of the lake and is composed of 92 megaflutes. This megaflute field is interrupted by a small group of 10 eskers. The megaflutes and eskers were developmed in a glacial suture area, where the río Cóndor tributary paleoglacier joined with the Viedma main Paleoglacier. The increase in thickness and speed of the ice body probably in LGM times could have been responsible of the development of this second megaflute field. Full concentration of glacial drainage systems along the suture area could have generated the eskers during LGM or Lateglacial times.