Quaternary of Tierra del Fuego, Southernmost South America: an updated review

Rabassa, Jorge; Coronato, Andrea; Bujalesky, Gustavo Gabriel; Salemme, Mónica; Roig, C.; Meglioli, Andrés; Heusser, Calvin J.; Gordillo, Sandra; Roig, Fidel A.; Borromei, Ana María; Quattrocchio, Mirta Elena

doi:10.1016/s1040-6182(00)00046-x

Cited by 222 publications

(228 citation statements)

References 43 publications

(57 reference statements)

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“…However, the outermost limit, now attributed to the Greatest Patagonian Glaciation Figure 2. The location and previously hypothesised Marine Isotope Stage (MIS) chronology of drift limits within the study area (Meglioli, 1992;Rabassa et al, 2000;Singer et al, 2004a). (GPG), has been shown to be much older than the LGM, with 40 Ar/ 39 Ar dating of interbedded volcanic deposits giving ages of around 1100 ka at numerous locations within the former PIS (Meglioli, 1992;Mercer, 1976;Ton-That, Singer, Morner, & Rabassa, 1999;Singer et al, 2004a). Recent cosmogenic dating of outwash depth-profiles at Lago Pueyrredón, east of the North Patagonian icefield, further supports these old ages (Hein, Dunai, Hulton, & Xu, 2011).…”

Section: Chronology Of Glacial Limitsmentioning

confidence: 99%

A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

et al. 2014

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This paper presents a glacial geomorphological map of the landforms created by five large ice lobes that extended eastwards from the southernmost reaches of the Patagonian Ice Sheet during the Quaternary period. The study is focussed on Tierra del Fuego, but also updates previous mapping of the Skyring and Otway lobes, and the resulting level of detail and extent is a significant advance on previous work in the region. The map has been created as the necessary precursor for an improved understanding of the glacial history of the region, and to underpin a programme of dating glacial limits in the region. It was produced using Landsat ETM+ and ASTER satellite imagery and vertical aerial photography, supplemented by Google Earth TM imagery and field-checking. Eleven landform types were mapped: moraine ridges, subdued moraine topography, kettle-kame topography, glacial lineations, irregular and regular hummocky terrain, irregular dissected ridges, eskers, meltwater channels, former shorelines and outwash plains. The map reveals three important characteristics of the glacial geomorphology. First, the geomorphic systems are largely dominated by landforms associated with meltwater (channels, outwash plains and kettle-kame topography). Second, there is a difference in the nature of landforms associated with the northern three ice lobes, where limits are generally marked by numerous clear moraine ridges, compared to those to the south, where hummocky terrain and drift limits prevail. Finally, cross-cutting landforms offer evidence of multiple advances, in places, which has implications for the timing of limit deposition, and thus for the design and interpretation of a dating programme.

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Section: Chronology Of Glacial Limitsmentioning

confidence: 99%

A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

et al. 2014

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“…The GPG and successive glaciations are also welldated, at least for the purposes of this study, in southernmost Patagonia (e.g., for the Bella Vista lobe), where 40 Ar/ 39 Ar ages of 1.168 and 1.07 Ma locally provide maximum and minimum ages of the GPG (Meglioli, 1992;Singer et al, 2004a). Subsequent glaciations in southernmost Patagonia/Tierra del Fuego are further defined with 40 Ar/ 39 Ar, U-Series, and cosmogenic nuclide data (Meglioli, 1992;Rabassa et al, 2000;Kaplan et al, 2007).…”

Section: Decreasing Ice Extent In Patagoniamentioning

confidence: 99%

“…For other areas of Patagonia, including Tierra del Fuego, Rabassa et al (2000) and Coronato et al (2004b) summarized the history of glaciations, including the geochronologic data. On the west side of the southern Andes, south of Isla Grande de Chiloé, the limit of the GPG and subsequent glaciations may have been always the continental shelf break (Clapperton, 1993;Hulton et al, 2002;Hubbard et al, 2005).…”

Section: Decreasing Ice Extent In Patagoniamentioning

confidence: 99%

“…Gibbons et al (1984) showed that the expected preservation is only 2-3 moraines for a random succession of advances, given that subsequent glacial advances remove previously deposited moraines. More than three moraines (from different glaciations) and represented in various areas studied along the Andes (Clapperton, 1993;Meglioli, 1992;Rabassa et al, 2000;Singer et al, 2004a;Kaplan et al, 2005) point to a non-random explanation for the overall trend. The pattern is also observed along most of Patagonia despite differences in tectonic setting and modern climate (Prohaska, 1976;Ramos, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Can glacial erosion limit the extent of glaciation?

et al. 2009

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In southern South America, the maximum areal extent of ice during the Quaternary Period, the Greatest Patagonian Glaciation (GPG, Mercer, 1983), occurred at 1.1 Ma and subsequent glaciations were overall less extensive. The GPG preceded global minimum temperatures and maximal volume of ice, which occurred in the last ~ 800 kyr, as recorded in the marine δ 18 O record. Significant modification of the drainage morphology of the southern Andes from a non-glaciated to glaciated landscape occurred throughout the Quaternary Period. We infer a non-climatic relationship between glacial modification of the mountains and decreasing the extent of ice and we discuss processes of landscape development that could have caused the trend. Specifically, these include modification of valleys, such as development from a V-to a Ushape, and lowering of mass-accumulation areas. Such changes would strongly affect glacial dynamics, the mass balance profile and mass-flux during succeeding glaciations, especially for low-gradient outlet glaciers occupying low areas. Other areas around Earth (at least where ice has been warm-based) also may exhibit a non-random trend of decreasing the extent of ice with time, ultimately because of glacial erosion in the Quaternary Period.

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“…En cuanto al clima, especialmente el invierno suele estar bajo la influencia de la corriente de aire antártica que proviene del sur; los vientos dominantes son los del sector sur y sudoeste (Rabassa et al, 2000). Se puede detectar un fuerte gradiente de precipitación asociado con la presión, los vientos y la barrera N-S/NW-SE de los Andes, que se refleja en la vegetación y los suelos.…”

Section: áRea De Estudiounclassified

Plant Palaeocommunities of Central Tierra del Fuego during the Early and Late Holocene

Burry¹,

Mandri²,

D’Antoni³

2006

MACN

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Plant Palaeocommunities of Central Tierra del Fuego during the Early and Late Holocene.This study presents new data for the history of vegetation of central Tierra del Fuego. The goal is to identify the vegetation types before and after the middle Holocene, having in mind previous studies proposing a forest expansion started in early Holocene times following a SW-NE precipitation gradient. Two segments of a Sphagnum peat bog profile (R-2: 54°32'S, 67°04'W), now surrounded by the Nothofagus pumilio (Poepp et Endl.) deciduous forest, were analyzed. The following results were obtained through the modern analogs method: steppe and woodland were found in the older segment and open and closed forest in the younger segment. We concluded that an asynchronous establishment of the involved plant communities occurred. In fact, ca. 7000 years BP, while in other sites of the central island forests were already established, in R-2, located eastwards from those sites, the steppe-woodland ecotone dominated. On the other hand, from ca. 2000 years AP to modern times both open and closed forests covered the central area. The humidity carried by the Southern Westerlies could have influenced the late development of Nothofagus. This study represents an advancement in the knowledge of the vegetation history, and provides new data about the asynchrony in the establishment of communities.

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Quaternary of Tierra del Fuego, Southernmost South America: an updated review

Cited by 222 publications

References 43 publications

A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

Can glacial erosion limit the extent of glaciation?

Plant Palaeocommunities of Central Tierra del Fuego during the Early and Late Holocene

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