Science and Technology Production
Article
Authorship
LOZANO, JORGE GABRIEL
;
Tassone, Alejandro Alberto
;
BRAN, DONALDO MAURICIO
;
Lodolo, Emanuele
;
Menichetti, Marco
;
Cerredo, Maria Elena
;
ESTEBAN, FEDERICO DAMIAN
;
Ormazabal, Juan Pablo
;
ISOLA, JOSÉ IGNACIO
;
Baradello, Luca
;
Vilas, Juan Francisco A.
Date
2018
Publishing House and Editing Place
Pergamon-Elsevier Science Ltd
Magazine
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,
vol. 86
(pp. 259-270)
Pergamon-Elsevier Science Ltd
Summary
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Lago Chepelmut is a relatively small lake in size, of ellipsoidal shape, located in the outer fold-and-thrust belt of the Fuegian Andes (southernmost South America). High-resolution single-channel seismic profiles, integrated with geological information in the surrounding area, have allowed to reconstruct for the first time a bathymetric map of the lake and the architecture, distribution and thickness of the sedimentary cover. Two main seismic units were identified in the seismic records: (i) a...
Lago Chepelmut is a relatively small lake in size, of ellipsoidal shape, located in the outer fold-and-thrust belt of the Fuegian Andes (southernmost South America). High-resolution single-channel seismic profiles, integrated with geological information in the surrounding area, have allowed to reconstruct for the first time a bathymetric map of the lake and the architecture, distribution and thickness of the sedimentary cover. Two main seismic units were identified in the seismic records: (i) a Lower Unit of glacial nature, likely associated to the Last Glacial Maximum (LGM), and irregularly distributed through the basin, and (ii) an Upper Unit of lacustrine origin which drapes the entire basin. Submerged moraine deposits within the lake were also found from seismic data, and correlated with moraine arcs widespread distributed in the surroundings of the basin. These morphologies represent the recessional deposits left by the Ewan glacier lobe, one of the easternmost fronts of the Tierra del Fuego glaciers during the LGM. The lacustrine sedimentary record shows that the lake level was not constant through the recent history of the lake. Moreover, data analysis has shown that there is also an important structural component that has conditioned the evolution of the basin, in addition to that linked to glacial activity.
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Key Words
QUATERNARY EVOLUTIONLAGO CHEPELMUTTIERRA DEL FUEGOGLACIAL MORPHOLOGYSINGLE-CHANNEL SEISMIC PROFILESSEDIMENTARY SEQUENCES
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