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

Esteban, Federico Damián; Tassone, Alejandro Alberto; Lodolo, Emanuele; Menichetti, Marco; Lippai, Horacio; Waldmann, Nicolás; Darbo, Alexia; Baradello, Luca; Vilas, Juan F.

doi:10.5027/andgeov41n2-a02

Cited by 14 publications

(6 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The result of this procedure was the compilation of two-way traveltime (TWT) grids with 0.001°spacing for: (i) the top of the acoustic basement, (ii) the top of the glacier unit: and (iii) the thickness of the glacio-lacustrine sequence. An analogous methodology was applied in the lakes of Tierra del Fuego, like Lago Fagnano (Esteban et al, 2014), Lago Yehuin (Lozano et al, 2018a), Lago Chepelmut (Lozano et al, 2018b) and Lago Roca (Bran et al, 2019).…”

Section: Map Production Proceduresmentioning

confidence: 99%

Depositional setting of the southern arms of Lago Argentino (southern Patagonia)

et al. 2020

Self Cite

View full text Add to dashboard Cite

Lago Argentino hosts a series of calving glaciers originating from the Southern Patagonian Icefield, the largest temperate ice cap of the southern hemisphere. Brazo Rico and Brazo Sur are two basins located in the southern part of Lago Argentino, where a series of highresolution seismic profiles have allowed reconstruction of its depositional setting and sedimentary architecture, and to produce the following maps: top of the acoustic basement, top of the glacial sequence, and thickness of the glacio-lacustrine deposits. Data reveal the role of basement highs in the complex dynamic behavior of the two main glaciers, Perito Moreno and Frías glaciers, which fluctuated along Brazo Rico and Brazo Sur since the end of the Last Glacial Maximum. Their advances and retreats are testified by the presence of several moraine fronts buried beneath a generally undisturbed, glacio-lacustrine and lacustrine sequence, which records the depositional history of the southern arms of Lago Argentino.

show abstract

Section: Map Production Proceduresmentioning

confidence: 99%

Depositional setting of the southern arms of Lago Argentino (southern Patagonia)

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…The minimum floor altitude (Alt min ), maximum headwall altitude (Alt max ) and mean altitude (Alt mean ) of each cirque were automatically derived from the DEM. Finally, bedrock lithology (based on Martinioni, 2001, andMalumián, 2008) and main structures (after Menichetti et al, 2008;Esteban et al, 2014;Torres-Carbonell et al, 2014, andBran et al, 2018) were recorded in order to analyse their effect on cirque size and morphology (Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

“…Lithological units afterOlivero and Malumián (2008). Tectonic context showing the main structural features is based onMenichetti et al (2008),Esteban et al (2014), Torres Carbonell et al (2014 andBran et al (2018).…”

mentioning

confidence: 99%

Morphometry and spatial distribution of glacial cirques in the Western Fuegian Andes of Argentina, southernmost South America

Oliva

Cioccale

Rabassa

2020

andgeo

View full text Add to dashboard Cite

Glacial cirques comprise a distinctive element of relief in alpine landscapes, and their morphometry, distribution and spatial arrangement are generally linked to morphoclimatic factors. This study provides an analysis of morphometric characteristics, floor altitude, aspect and distribution of 251 first-order and 99 "inner" cirques with regard to environmental agents in a selected alpine-type area of the southwestern Fuegian Andes, in Southern Argentina. Parametric variables were extracted and quantified from satellite images and a Digital Elevation Model, and integrated to a Geographical Information System for their systematization and processing. Significant associations were identified between the different geometric and spatial parameters evaluated. Variability in cirque morphometry along the study area suggests that their evolution was regulated to a large degree by glacial dynamics related to Beagle palaeoglacier activity, and by the W-E topographic gradient of the mountain section. The record indicates that most cirques in the Fuegian Andes have undergone allometric enlargement in the three dimensions (i.e., lesser vertical erosion compared to walls' horizontal expansion), with local variations in size and shape controlled by ice residence time, aspect and altitude, whereas geological structure is supposed to have affected cirque formation along the entire mountain chain. Cirque azimuth potentially responds to the combined influence of climate (solar radiation and westerly winds), structure (pervasive faulting and rock bedding) and topography in their development. In particular, dominance of southeasterly aspects is interpreted as a consequence of a relatively cloud-free atmosphere and aridity during past glacial periods in the region, consistently with published evidence. The absence of aspect-related variation in cirque floor altitude is considered to indicate incidence of extensive glaciations in the area (i.e., mostly ice-sheet conditions, with mountain peaks far above the regional equilibrium line altitude or ELA), as well as formation of younger, lower cirques during successive cold periods of different intensity. Occurrence of "inner" cirques inside larger (preexisting) cirques is thought to reflect a temporary positioning of the ELA just above the floor of the container cirque, permitting short-lived, small cirque-type glaciers to develop along structural bedrock weaknesses.

show abstract

“…Esteban et al. (2014) analyzed bathymetric and seismic data available in the lake and confirm that it is composed of 4 amalgamated pull‐apart sub‐basins. In contrast, between the eastern edge of Lago Fagnano and the Atlantic coast, there is no evidence of major active pull‐apart basin except perhaps the very small Udaeta Lake pull‐apart (Onorato et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Ten Thousand Years of Paleo‐Earthquakes Record of the Magallanes‐Fagnano Plate Boundary Fault in Tierra del Fuego, Argentina

et al. 2023

View full text Add to dashboard Cite

This left-lateral plate boundary continues over almost 3,000 km, from the Pacific entrance of the Magellan Strait to the West, to the North Scotia Ridge and the Scotia subduction zone in the Atlantic Ocean to the East (Figure 1a). Most of this transform fault zone is offshore, Tierra del Fuego representing the largest onshore section of the fault system. The fault crosses the island on ∼180 km from the Almirantazgo Sound in Chile to the Atlantic Ocean in Argentina, but a large part of the fault is located beneath the 100 km-long Fagnano Lake (Figure 1b). In Argentina, the fault outcrops onshore on approximately 70 km between the eastern edge of the lake and the Atlantic coast (Figure 1c).Although the analysis of brittle deformation and clastic dikes orientations suggest that some left-lateral strike-slip motion may have been accommodated along the fault zone since the Oligocene or early Miocene (Ghiglione, 2002;Ghiglione & Ramos, 2005;Klepeis, 1994), it appears that the onset of strike-slip faulting in Tierra del Fuego

show abstract

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

Cited by 14 publications

References 30 publications

Depositional setting of the southern arms of Lago Argentino (southern Patagonia)

Depositional setting of the southern arms of Lago Argentino (southern Patagonia)

Morphometry and spatial distribution of glacial cirques in the Western Fuegian Andes of Argentina, southernmost South America

Ten Thousand Years of Paleo‐Earthquakes Record of the Magallanes‐Fagnano Plate Boundary Fault in Tierra del Fuego, Argentina

Contact Info

Product

Resources

About