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Registros recuperados: 4
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First evidence of a mid-Holocene earthquake-triggered megaturbidite south of the Chile Triple Junction 5
Piret, Loic; Bertrand, Sebastien; Kissel, Catherine; De Pol-holz, Ricardo; Tamayo Hernando, Alvaro; Van Daele, Maarten.
Megaturbidites have been the focus of many paleoseismic and paleoenvironmental studies because they can provide evidence for catastrophic and/or hazardous events with potentially major environmental implications. During a recent research cruise in Baker Fjord, Chile (47°54′S–74°30′W), a megaturbidite was described between the Northern and Southern Patagonian Icefields. Here, we aim to determine the depositional processes of the megaturbidite and identify its origin. Based on the turbidite's location, a possible origin was the early Holocene drainage of paleo-lake General Carrera, which was recently proposed in the literature as having produced a Glacial Lake Outburst Flood (GLOF) that drained through Baker Fjord. Due to the fjord's location in a subduction...
Tipo: Text Palavras-chave: Turbidite; Sediment provenance; Patagonia; Holocene; Earthquake.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00425/53700/54551.pdf
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Geochemistry of surface sediments from the fjords of Northern Chilean Patagonia (44-47 degrees S): Spatial variability and implications for paleoclimate reconstructions 5
Bertrand, Sebastien; Hughen, Konrad A.; Sepulveda, Julio; Pantoja, Silvio.
The Patagonian fjords have a clear potential to provide high-resolution sedimentary and geochemical records of past climate and environmental change in the Southern Andes. To improve our ability to interpret these proxy records, we investigated the processes that control fjord sediment inorganic geochemistry through a geochemical, mineralogical and sedimentological analysis of surface sediment samples from the fjords of Northern Chilean Patagonia. A simple Terrestrial Index based on measurements of salinity and Fraction of Terrestrial Carbon was used to estimate the terrestrial input/river discharge at each site. Our results demonstrate that, under the cold climate conditions of Patagonia, chemical weathering is weak and the inorganic geochemical...
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Ano: 2012 URL: https://archimer.ifremer.fr/doc/00092/20299/17933.pdf
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Holocene variations in productivity associated with changes in glacier activity and freshwater flux in the central basin of the Strait of Magellan 5
Aracena, Claudia; Kilian, Rolf; Lange, Carina B.; Bertrand, Sebastien; Lamy, Frank; Arz, Helge W.; De Pol-holz, Ricardo; Baeza, Oscar; Pantoja, Silvio; Kissel, Catherine.
One of the most important factors controlling fjord primary production in southernmost Patagonia is the variability in the thermohaline structure of the water column. In the present-day environment, thermal stratification is mostly related to freshwater input and in particular, the seasonal melting of glaciers. Here we assess whether this relation between fjord productivity and freshwater input holds true for the Holocene, using a sediment record from the central basin of the Strait of Magellan (core MD07-3132, 53°44.17′S; 70°19.03′W, 301 m). Our approach relies on a proxy-based reconstruction of fjord sea surface temperature (alkenone SST), paleosalinity, freshwater input, and paleoproductivity. The results indicate that, during the early Holocene, the...
Tipo: Text Palavras-chave: Strait of Magellan; Holocene; Paleoproductivity; Thermohaline conditions.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00294/40518/39325.pdf
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Late Holocene covariability of the southern westerlies and sea surface temperature in northern Chilean Patagonia 5
Bertrand, Sebastien; Hughen, Konrad; Sepulveda, Julio; Pantoja, Silvio.
The climate of Chilean Patagonia is strongly influenced by the southern westerlies, which control the amount and latitudinal distribution of precipitation in the southern Andes. In austral summer, the Southern Westerly Wind Belt (SWWB) is restricted to the high latitudes. It expands northward in winter, which results in a strong precipitation seasonality between similar to 35 and 45 degrees S. Here, we present a new precipitation seasonality proxy record from Quitralco fjord (46 degrees S), where relatively small latitudinal shifts of the SWWB result in large changes in precipitation seasonality. Our 1400 yr record is based on sedimentological and geochemical data obtained on a sediment core collected in front of a small river that drains the Patagonian...
Tipo: Text Palavras-chave: Southern westerlies; Inorganic geochemistry; Paleohydrology; Paleohydroclimatology; Fjord sediments; Southern South America; Chilean Patagonia.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00289/40044/39295.pdf
Registros recuperados: 4
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