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

Lozano, Jorge Gabriel; Donda, Federica; Lodolo, Emanuele; Baradello, Luca; Romeo, Roberto; Vilas, Juan F.; Grossi, Maurizio; Tassone, Alejandro Alberto

doi:10.1080/17445647.2020.1746700

Cited by 6 publications

(12 citation statements)

References 22 publications

(23 reference statements)

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“…4 , 5 C, 5D). The overall internal architecture of this seismic facies is well-layered and made by sub-horizontal, sub-parallel, and continuous reflectors; it has been interpreted as a glacio-lacustrine deposit 30 , 31 . Here we focus our analysis on the moraine complex closest to the glacial front found from the geophysical data.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Studies on the seismostratigraphic and depositional architecture of the study area 30 , 31 and on the distribution of the subaqueous landforms highlighting the late-glacial glacier fluctuations 32 have been already published. They revealed the occurrence of three main seismostratigraphic units 30 , 31 . The lowermost seismic reflector detectable from seismic profiles is represented by a highly irregular surface, which we interpreted as the top of the acoustic basement, and characterized by a medium- to high-amplitude, chaotic, reflection-free seismic response (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…This is particularly true for the glaciers that now flow into Lago Argentino. Recently, Lodolo et al 30 and Lozano et al 31 , using bathymetric records and high-resolution seismic profiles, have unveiled the submerged glacialrelated deposits along the two southern arms of Lago Argentino, i.e. Brazo Rico ad Brazo Sur, some of which being correlated to those known onland.…”

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The submerged footprint of Perito Moreno glacier

Lodolo

Donda

Lozano

et al. 2020

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Perito Moreno is the most famous calving glacier of the South Patagonia Icefield, the largest temperate glacier system of the Southern Hemisphere. Unlike most of the glaciers in the region that have strongly retreated in recent decades, the position of Perito Moreno glacier front remained relatively unchanged in the last century. However, earliest photographic documents show that, at the end of the nineteenth century, the front was ca. 800 m behind the current position. There is no reliable information about the positions of the Perito Moreno front in earlier times. Here we show evidence of two subaqueous moraine systems both in the Canal de Los Témpanos and in the Brazo Rico, the two arms of Lago Argentino along which Perito Moreno glacier has flowed over time. These moraines, identified for the first time in the Canal de Los Témpanos from bathymetric and high-resolution seismic profiles, mark the position of the largest glacier advance, tentatively correlated with the moraines of the “Herminita advance” identified and dated onland. We interpret these bedforms as the evidence of the most pronounced advance of Perito Moreno glacier during the mid-Holocene cooling event that characterized this sector of the Southern Hemisphere. This study highlights the importance of subaqueous glacial bedforms, representing decisive records of the glacial history and palaeoclimate, which could help unveiling the origin of the different behavior of glaciers like Perito Moreno that in a warming climate are relatively stable.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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The submerged footprint of Perito Moreno glacier

Lodolo

Donda

Lozano

et al. 2020

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“…The transparent red inset indicates the location of the study area. (b) The eastern Brazo Sur inlet where the three cores have been recovered; bathymetry is taken from Lodolo et al (2020a) and Lozano et al (2020).…”

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confidence: 99%

Stratigraphic signature of the Perito Moreno ice-dammings during the Little Ice Age (southern Patagonia, Argentina)

et al. 2021

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The spectacular water outburst occurring semi-periodically when the ice-dam formed by the external front of the Perito Moreno glacier collapses, is one of the most attracting events in the UNESCO ‘Parque Nacional Los Glaciares’ of southern Patagonia. These occurrences have been documented since 1936. Instead, evidence of previous events has been only indirectly provided by dendrochronology analysis. Here we show for the first time radiocarbon-dated sediment cores collected within a small inlet of Brazo Sur, that is, the southern arm of Lago Argentino that record ice-dammings in the Little Ice Age, at 324–266 cal yrs BP, as measured on a vegetal fragment sampled at ca. 14 cm from the top of a core. A common characteristic of the three sediment cores is the abrupt change in the stratigraphic record found at variable depths of 14–18 cm from the top of the cores. This change is marked by a hiatus spanning ca. 3200 years, separating planar-laminated sediments below from an alternation of erosional and depositional events above it, indicating recurring high-energy conditions generated by the emptying of the lake basin. In addition, we observed significant changes in the abundance of environmental indicators as testate amoebae below and above the hiatus. These well-preserved stratigraphic records highlight the key role of glaciolacustine deposits in reconstructing the glacial dynamics and palaeoclimate evolution of a glaciated region.

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Structure, seismostratigraphy, and tectonic evolution of Lago Roca (southern Patagonia, Argentina)

et al. 2022

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Lago Roca is a NE–SW elongated lacustrine body located to the south of Lago Argentino, the largest lake of the UNESCO ‘Los Glaciares’ National Park. An extensive high‐resolution seismic survey carried out within the Lago Roca, integrated with geological information gathered in the area, have allowed to produce: (a) a complete bathymetric map of the lake; (b) a basement topography map and a structural map; and (c) an analysis of the geometry, distribution, and thickness of the sedimentary infill. Two sub‐basins were recognized in Lago Roca, separated by a central basement high that shows a pop‐up structure. The northern and southern margins of the lake basement are bounded by NE–SW trending strike‐slip faults that constitute subsidiary faults strands of the regional structural lineament known as the ‘Lago Argentino transfer fault’. The shallow, low magnitude seismicity recorded in the area supports the interpretation that this fault segment is active at the present. The relative motion along the fault led to the deformation of the sedimentary infill of the lake, which was also affected by several subsidiary normal faults oriented parallel to the Lago Argentino transfer fault. Data show the peculiar asymmetry in the sedimentary filling of Lago Roca, typical of those of pull‐apart basins generated along transform margins. A simplified model for the evolution of Lago Roca is also here proposed, based on the analysed data and the regional tectonic background.

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

Cited by 6 publications

References 22 publications

The submerged footprint of Perito Moreno glacier

The submerged footprint of Perito Moreno glacier

Stratigraphic signature of the Perito Moreno ice-dammings during the Little Ice Age (southern Patagonia, Argentina)

Structure, seismostratigraphy, and tectonic evolution of Lago Roca (southern Patagonia, Argentina)

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