CABALERI nora Graciela
congresos y reuniones científicas
Palynology, palynofacies and paleoenvironment of the lacustrine Cañadón Asfalto Formation, Jurassic of central Patagonia, Argentina.
VOLKHEIMER, WOLFGANG; QUATROCCIO, MIRTA; CABALERI, NORA; GARCÍA, VIVIAN
San Antonio, Texas
Simposio; 34th Annual Meeting of the American Association of Stratigraphic Palynologists. Symposium-Central and South American palynology; 2001
San Antonio University
The stratigraphic analysis of the Cañadón Asfalto Formation at Cañadón Lahuincó results a volcano-sedimentary sequence with olivinic basalts and green tuffs at the base, covered by a siliciclastic, lacustrine sequence. The sediments represent short cycles related with periods of contraction and expansion of the water level of the paleolake. During expansion, the lake invaded littoral areas, producing black pelites and limestones of palustrine type. In change, during extremely dry intervals, the water body contracted, gypsum precipitated and diseccation breccia formed. Such conditions prevailed in the uppermost levels of the Formation, where the sedimentary regime is changing from carbonatic to siliciclastic, with levels indicating deltaic environments and hyperconcentrated deposits.