Origin and evolution of lago yehuin (Tierra del fuego, Argentina): Results from a geophysical survey
Lago Yehuin, a WNW-ESE elongated basin located in the outer fold-and-thrust belt of the Fuegian Andes, occupies a compartmented structural depression originated along a segment of the left-lateral Lago Deseado fault system. This paper describes the first geophysical survey performed within the lake....
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todo:paper_07187092_v45_n3_p318_Lozano2023-10-03T15:36:47Z Origin and evolution of lago yehuin (Tierra del fuego, Argentina): Results from a geophysical survey Lozano, J.G. Tassone, A. Lodolo, E. Menichetti, M. Cerredo, M.E. Bran, D.M. Esteban, F. Ormazabal, J.P. Baradello, L. Vilas, J.F. Fuegian andes Lago yehuin Single-channel seismic profiles Strike-slip tectonics data interpretation fold and thrust belt geophysical survey lake seismic data seismic stratigraphy seismic survey strike-slip fault structural control structural geology tectonic evolution tectonic setting Andes Argentina Tierra del Fuego [(PRV) Argentina] Lago Yehuin, a WNW-ESE elongated basin located in the outer fold-and-thrust belt of the Fuegian Andes, occupies a compartmented structural depression originated along a segment of the left-lateral Lago Deseado fault system. This paper describes the first geophysical survey performed within the lake. New acquired high-resolution single-channel seismic data, integrated with geological information in the surroundings of the Lago Yehuin, allowed to: (i) produce a complete bathymetric map of the lake, (ii) reconstruct the basement surface of the lake, and (iii) analyze the geometry, distribution, and thickness of the sedimentary infill. Two sub-basins were recognized within Lago Yehuin: A western sub-basin, 7.5 km long, with a maximum depth of 118 m; an eastern sub-basin, 7.2 km long with a maximum depth of 80 m. Both sub-basins are limited by a set of normal faults which overprint NE-verging thrusts. Three seismo-stratigraphic units have been identified in the seismic records: (1) a lower unit with wedged geometry interpreted as a mass flow deposits; (2) a thick (up to 120 m) intermediate unit of glacio-lacustrine nature and irregularly distributed in the Yehuin basin; (3) a thin (generally <10 m) upper lacustrine unit which drapes the entire basin. Lago Yehuin is considered a Neogene basin generated by strike-slip tectonics that was later affected by glacial and glacio-lacustrine deposition. Interpreted submerged ridge moraines within Lago Yehuin are correlated with onland moraine arcs built by the complete recessional paths of Fuego and Ewan ice lobes. A significant structural control is proposed not only for the formation of Lago Yehuin, but also for the general paths of the northern arms of the Fagnano palaeo-glacier. © 2018, Servicio Nacional de Geologia y Mineria. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07187092_v45_n3_p318_Lozano |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Fuegian andes Lago yehuin Single-channel seismic profiles Strike-slip tectonics data interpretation fold and thrust belt geophysical survey lake seismic data seismic stratigraphy seismic survey strike-slip fault structural control structural geology tectonic evolution tectonic setting Andes Argentina Tierra del Fuego [(PRV) Argentina] |
| spellingShingle |
Fuegian andes Lago yehuin Single-channel seismic profiles Strike-slip tectonics data interpretation fold and thrust belt geophysical survey lake seismic data seismic stratigraphy seismic survey strike-slip fault structural control structural geology tectonic evolution tectonic setting Andes Argentina Tierra del Fuego [(PRV) Argentina] Lozano, J.G. Tassone, A. Lodolo, E. Menichetti, M. Cerredo, M.E. Bran, D.M. Esteban, F. Ormazabal, J.P. Baradello, L. Vilas, J.F. Origin and evolution of lago yehuin (Tierra del fuego, Argentina): Results from a geophysical survey |
| topic_facet |
Fuegian andes Lago yehuin Single-channel seismic profiles Strike-slip tectonics data interpretation fold and thrust belt geophysical survey lake seismic data seismic stratigraphy seismic survey strike-slip fault structural control structural geology tectonic evolution tectonic setting Andes Argentina Tierra del Fuego [(PRV) Argentina] |
| description |
Lago Yehuin, a WNW-ESE elongated basin located in the outer fold-and-thrust belt of the Fuegian Andes, occupies a compartmented structural depression originated along a segment of the left-lateral Lago Deseado fault system. This paper describes the first geophysical survey performed within the lake. New acquired high-resolution single-channel seismic data, integrated with geological information in the surroundings of the Lago Yehuin, allowed to: (i) produce a complete bathymetric map of the lake, (ii) reconstruct the basement surface of the lake, and (iii) analyze the geometry, distribution, and thickness of the sedimentary infill. Two sub-basins were recognized within Lago Yehuin: A western sub-basin, 7.5 km long, with a maximum depth of 118 m; an eastern sub-basin, 7.2 km long with a maximum depth of 80 m. Both sub-basins are limited by a set of normal faults which overprint NE-verging thrusts. Three seismo-stratigraphic units have been identified in the seismic records: (1) a lower unit with wedged geometry interpreted as a mass flow deposits; (2) a thick (up to 120 m) intermediate unit of glacio-lacustrine nature and irregularly distributed in the Yehuin basin; (3) a thin (generally <10 m) upper lacustrine unit which drapes the entire basin. Lago Yehuin is considered a Neogene basin generated by strike-slip tectonics that was later affected by glacial and glacio-lacustrine deposition. Interpreted submerged ridge moraines within Lago Yehuin are correlated with onland moraine arcs built by the complete recessional paths of Fuego and Ewan ice lobes. A significant structural control is proposed not only for the formation of Lago Yehuin, but also for the general paths of the northern arms of the Fagnano palaeo-glacier. © 2018, Servicio Nacional de Geologia y Mineria. All rights reserved. |
| format |
JOUR |
| author |
Lozano, J.G. Tassone, A. Lodolo, E. Menichetti, M. Cerredo, M.E. Bran, D.M. Esteban, F. Ormazabal, J.P. Baradello, L. Vilas, J.F. |
| author_facet |
Lozano, J.G. Tassone, A. Lodolo, E. Menichetti, M. Cerredo, M.E. Bran, D.M. Esteban, F. Ormazabal, J.P. Baradello, L. Vilas, J.F. |
| author_sort |
Lozano, J.G. |
| title |
Origin and evolution of lago yehuin (Tierra del fuego, Argentina): Results from a geophysical survey |
| title_short |
Origin and evolution of lago yehuin (Tierra del fuego, Argentina): Results from a geophysical survey |
| title_full |
Origin and evolution of lago yehuin (Tierra del fuego, Argentina): Results from a geophysical survey |
| title_fullStr |
Origin and evolution of lago yehuin (Tierra del fuego, Argentina): Results from a geophysical survey |
| title_full_unstemmed |
Origin and evolution of lago yehuin (Tierra del fuego, Argentina): Results from a geophysical survey |
| title_sort |
origin and evolution of lago yehuin (tierra del fuego, argentina): results from a geophysical survey |
| url |
http://hdl.handle.net/20.500.12110/paper_07187092_v45_n3_p318_Lozano |
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