Glacial geomorphology of the Pleistocene Lake Fagnano ice lobe, Tierra del Fuego, southern South America

Coronato, Andrea; Seppälä, Matti; Ponce, Juan Federico; Rabassa, Jorge

doi:10.1016/j.geomorph.2009.05.005

Cited by 66 publications

(127 citation statements)

References 23 publications

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“…This glaciation covered an area of ~4,000 km 2 and its front extended 35 km eastward of the present day lake coast (Fig. 1, Coronato et al, 2009). The glacial accumulation of the Fagnano glacier in the Last Glacial Maximum extended just to the present Río Claro outlet.…”

Section: Glacial Historymentioning

confidence: 92%

“…The lowlands around LF are characterized by Quaternary fluvial, glacio-fluvial and glacial deposits. Along the NW and mainly the SE to E shores of LF, different types of moraines have been recognized by Coronato et al (2009). The fluvial and glacio-fluvial deposits are related to the main rivers (Río Claro, Río Turbio) that flow towards the lake ( Fig.…”

Section: Simplified Stratigraphic Settingmentioning

confidence: 99%

“…At least three ice-tongues spread from the accumulation zone towards north and northeast, and eastwards to the LF eastern sector (Fig. 1, Coronato et al, 2009).…”

Section: Glacial Historymentioning

confidence: 99%

“…Despite the general withdrawal, a succession of higher-humidity short periods caused glaciers re-advances (Waldmann et al, 2010a). At least, four recessional phases have been recognized for this retreatment (Coronato et al, 2009;Waldmann et al, 2010a). In the Earliest Late Glacial (recessional phase 1) the ice expanded, covering all the current LF and originating the Tolhuin-Jeu Jepen frontal moraine (Coronato et al, 2009).…”

Section: Glacial Historymentioning

confidence: 99%

“…Glacial sediments accumulated during the entire Holocene, and may date back to the Last Glacial Maximum (Coronato et al, 2009;Rabassa et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Geometría del basamento y espesores sedimentarios del lago Fagnano (Tierra del Fuego).

Esteban

Tassone

Lodolo

et al. 2014

Andgeo

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ABSTRACT. Lago Fagnano, an E-W elongated basin located in the central part of Isla Grande de Tierra del Fuego, occupies a structural depression originated along a segment of the Magallanes-Fagnano fault system. Its evolution was mostly conditioned by tectonic processes, and later was affected by glacial and glacio-lacustrine depositional events. New high-resolution single-channel seismic data, integrated with previous seismic profiles, and geological information acquired in the surroundings of the Lago Fagnano, allows us reconstructing the basement surface of the lake, and the geometry, distribution, and thickness of the glacial and glacio-lacustrine sequences. We recognized three main sub-basins within the Lago Fagnano: 1. a medium-size (ca. 21x5 km), deep (373 m), and asymmetric basin to the east; 2. an E-W trending (44x3 km), shallower (150 m) central sub-basin; and 3. a smaller (3.5x1.3 km), shallow (128 m) sub-basin to the west. The isopach sediment map shows that the most pronounced deposition occurred along the E-W axis of the lake, with a gradual increase in thickness towards east (from 100 to 150 m). The glacial deposits are widespread along the basin. The lacustrine sediments are preferentially localized along the E-W axis of the lake filling topographic lows. The shape of the sub-basins and their location in relation with the Magallanes-Fagnano fault system, along with the distribution, geometry, and thickness of the sedimentary units, show that the general morphology of the Lago Fagnano was mostly controlled by pre-existing and syntectonic features. Based on the structural data observed in the outcrops around the Lago Fagnano and the geophysical data, we proposed that the lake is composed by 4 amalgamated pull-apart sub-basins. RESUMEN. Geometría del basamento y espesores sedimentarios del lago Fagnano (Tierra del Fuego). El lagoFagnano, una cuenca elongada E-W en la parte central de la isla Grande de Tierra del Fuego, ocupa una depresión estructural originada a lo largo de un segmento del sistema de fallas Magallanes-Fagnano. Su evolución estuvo principalmente condicionada por procesos tectónicos y, luego, fue afectada por eventos deposicionales glaciales y glaciolacustres. Nueva sísmica monocanal de alta resolución, integrada con perfiles sísmicos previos e información geológica adquirida en los alrededores del lago Fagnano, nos permite reconstruir la superficie del basamento del lago, y las geometrías y espesores de las secuencias glaciales y glaciolacustres. Reconocimos tres subcuencas principales dentro del Lago Fagnano: 1. una subcuenca asimétrica profunda (373 m) de tamaño medio (ca. 21x5 km) en el este; 2. una gran subcuenca central (44x3 km) más somera (150 m); y 3. una pequeña subcuenca occidental (3,5x1,3 km) somera (128 m). El mapa isopáquico muestra que los mayores depósitos se localizan a lo largo del eje E-W del lago, con un incremento gradual del espesor hacia el este (de 100 a 150 m). Los depósitos glaciales están ampliamente distribuidos a lo largo de la cuenca. Los sedimentos lacu...

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Section: Glacial Historymentioning

confidence: 92%

Section: Simplified Stratigraphic Settingmentioning

confidence: 99%

“…At least three ice-tongues spread from the accumulation zone towards north and northeast, and eastwards to the LF eastern sector (Fig. 1, Coronato et al, 2009).…”

Section: Glacial Historymentioning

confidence: 99%

Section: Glacial Historymentioning

confidence: 99%

“…Glacial sediments accumulated during the entire Holocene, and may date back to the Last Glacial Maximum (Coronato et al, 2009;Rabassa et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Geometría del basamento y espesores sedimentarios del lago Fagnano (Tierra del Fuego).

Esteban

Tassone

Lodolo

et al. 2014

Andgeo

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The central Fuegian fold and thrust belt in Tierra del Fuego: Strike‐slip tectonics superimposed onto compressional deformation

et al. 2020

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The boundary between South America and Scotia plates was established during Neogene times when a wrench tectonic regime was developed along the central area of Tierra del Fuego. This boundary includes the Magallanes–Fagnano fault system: a regional diffuse deformation zone, which involves the development of the satellite Yehuin–Chepelmut fault zone and a series of pull‐apart basins overprinting the Fuegian fold and thrust belt. The analysis of regional seismic lines allowed to reconstruct and recognize the structure of the external fold and thrust belt. The interpreted structures were integrated into a regional transect and a 3D block diagram that display the different structural domains and, mainly, the wrench deformation associated with the Magallanes–Fagnano fault system. Geophysical data from gravity and magnetic anomaly maps provided further support for the location and development of the pull‐apart basins along the plate boundary. The deformation of the external fold and thrust belt is characterized by an imbricated fan system with a Paleogene detachment surface, which was later cut across by the Yehuin–Chepelmut fault zone and the Magallanes–Fagnano fault system.

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Post‐Last Glacial Maximum evolution of a “fjord‐type” lake based on high‐resolution seismic data: the Lago Roca/Acigami (southern Tierra del Fuego, Argentina/Chile)

Lozano

Civile

Lodolo

et al. 2019

J Quaternary Science

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Lago Roca/Acigami is a “fjord‐type” lake located in the southernmost part of South America, in the proximity of the Beagle Channel. A high‐resolution seismic survey was carried out to analyse the seismic stratigraphy of the lake and to shed some light on the post‐Last Glacial Maximum history of the area. Six seismic units were recognised, and their nature and depositional context were interpreted using seismic stratigraphy and acoustic facies analysis. A buried large ridge was identified within the glacial unit (SU1), interpreted as a frontal moraine that indicates a stabilisation phase. After retreat of the glacier from the basin, the trough was flooded by meltwater and a lake developed (SU2). The seismic facies, from bottom to top, depict a transition from ice‐contact (SU2; SU3) to ice‐distal proglacial conditions (SU4). A thick draping unit (SU5) marks a marine transgressive event and the instauration of a fjord environment in the basin. The marine transgression was a rapid event preceded by a fall in the lake level that caused an erosional unconformity. During the fjord phase the sedimentation remained controlled by meltwater discharge. Sea level fall, and subsequent disconnection from the Beagle Channel was accompanied by a progradation of the glaciofluvial deltaic sediments and the occurrence of several mass‐wasting deposits (SU6). © 2019 John Wiley & Sons, Ltd.

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Glacial geomorphology of the Pleistocene Lake Fagnano ice lobe, Tierra del Fuego, southern South America

Cited by 66 publications

References 23 publications

Geometría del basamento y espesores sedimentarios del lago Fagnano (Tierra del Fuego).

Geometría del basamento y espesores sedimentarios del lago Fagnano (Tierra del Fuego).

The central Fuegian fold and thrust belt in Tierra del Fuego: Strike‐slip tectonics superimposed onto compressional deformation

Post‐Last Glacial Maximum evolution of a “fjord‐type” lake based on high‐resolution seismic data: the Lago Roca/Acigami (southern Tierra del Fuego, Argentina/Chile)

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