Deciphering lake and maar geometries from seismic refraction and reflection surveys in Laguna Potrok Aike (southern Patagonia, Argentina)

Gebhardt, Catalina; Batist, Marc De; Niessen, Frank; Anselmetti, Flavio S.; Ariztegui, Daniel; Haberzettl, Torsten; Kopsch, Conrad; Ohlendorf, Christian; Zolitschka, Bernd

doi:10.1016/j.jvolgeores.2010.12.019

Cited by 35 publications

(31 citation statements)

References 16 publications

(28 reference statements)

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“…The maar presents a very steep geometry with a water column of a maximal depth of 100 m (Gebhardt et al 2011). Climatic parameters exert substantial control on the lake level ) and can lead to important changes in organic sources and geochemical conditions recorded in the sediment (Recasens et al 2012;Hahn et al 2013).…”

Section: Study Area and Samplingmentioning

confidence: 99%

“…The investigations presented here were carried out in two hydraulic piston cores 5022-1A and 5022-1D of 65 mm diameter, and 87 and 97 m long, respectively (Ohlendorf et al 2011), retrieved from the centre of the maar at 100 m water depth in autumn 2008. The cores were sampled at a resolution of one meter, avoiding felsic tephra layers and organic macroremains.…”

Section: Study Area and Samplingmentioning

confidence: 99%

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Influence of Methanogenic Populations in Holocene Lacustrine Sediments Revealed by Clone Libraries and Fatty Acid Biogeochemistry

Vuillemin

Ariztegui

Nobbe

et al. 2014

Geomicrobiology Journal

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Influence of methanogenic populations in Holocene lacustrine sediments revealed by clone libraries and fatty acid biogeochemistry Abstract Methanogenic populations were investigated in subsaline Laguna Potrok Aike sediments, southern Argentina. Microbial density and activity were assessed via cell count and in situ ATP detection for the last ~11K years. Methanogen phylogenetics highlighted species stratification throughout depth, whereas CO 2 reduction was the major pathway leading to methane production. Organic substrates, characterized using pore water analysis, bulk organic fractions and saturated fatty acids, showed a clear link between sediment colonization and initial organic sources. Concentrations and 13 C compositions of methane and fatty acids provided final evidence of a microbial imprint on Holocene organic proxies in the most colonized intervals.

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Section: Study Area and Samplingmentioning

confidence: 99%

Section: Study Area and Samplingmentioning

confidence: 99%

Influence of Methanogenic Populations in Holocene Lacustrine Sediments Revealed by Clone Libraries and Fatty Acid Biogeochemistry

Vuillemin

Ariztegui

Nobbe

et al. 2014

Geomicrobiology Journal

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“…This type of relief is found in fjords, fjord-type lakes and in tectonically or volcanically formed lakes (Sturm and Matter, 1978;Bøe et al, 2004;Schnellmann et al, 2005;Gebhardt et al, 2011) as well as in impact crater lakes (Nolan and Brigham-Grette, 2007;Shanahan et al, 2006). Adequate sediment input is one of the most important prerequisites for the initiation of slope failure, and can also control the frequency of such events.…”

Section: Introductionmentioning

confidence: 99%

Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic

et al. 2013

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This paper focuses on the characterization and genesis of mass movement deposits (MMDs) in the Quaternary and Pliocene sediments of Lake El'gygytgyn, Far East Russian Arctic. Three partly overlapping holes were drilled into the 320 m long sediment record at International Continental Scientific Drilling Program (ICDP) Site 5011-1 in the lake basin, recovering the Quaternary almost completely, and the Pliocene down to 3.6 Ma with 52% recovery. Mass movement deposits were investigated in all three cores, based on macroscopical core descriptions, radiographic images, high-resolution magnetic susceptibility and gamma-ray density. Five different types of MMDs were identified: turbidites, grain-flow deposits, debrites, slumps and slides. These are formed by transitional mass movement processes, and thus can be co-generic. An initial slope failure is thought to transform into a debris flow that deforms frontal sediments, partly disintegrates and dilutes into a turbidity flow. Turbidites are by far the most frequent MMD type in the lake center. They occur throughout the record in all pelagic sedimentary facies, but they are thinner in facies formed during cold climate conditions. All other MMDs, by contrast, incise exclusively the pelagic facies deposited during warm climates. In the 123 m thick Quaternary composite sediment record 230 mass movement events are identified, comprising 33% of the sediment length. Turbidites contribute 93% of the number of Quaternary MMDs, but only 35% of their thickness. In the Pliocene sediments between 123 and 320 m, 181 additional mass movement deposits are identified, which constitute ~33% of the recovered sediments. The mean recurrence interval for MMDs is 11 and 5 ka in the Quaternary and Pliocene, respectively

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“…1B). The deepest‐penetrating seismic surveys revealed a funnel‐like structure that is filled by up to 370 m of unconsolidated lacustrine muds (Gebhardt et al. , 2011).…”

Section: Study Areamentioning

confidence: 99%

Seismic evidence of up to 200 m lake‐level change in Southern Patagonia since Marine Isotope Stage 4

et al. 2011

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Maar lake Laguna Potrok Aike is located north of the Strait of Magellan (south‐eastern Patagonia). Seismic reflection profiles revealed a highly dynamic palaeoclimate history. Dunes were identified in the eastern part of the lake at approximately 30 to 80 m below the lake floor, overlying older lacustrine strata, and suggest that the region experienced dry conditions probably combined with strong westerly winds. It is quite likely that this can be linked to a major dust event recorded in the Antarctic ice cores during Marine Isotope Stage 4. The dunes are overlain by a series of palaeo‐shorelines indicating a stepwise water‐level evolution of a new lake established after this dry period, and thus a change towards wetter conditions. After the initial, rapid and stepwise lake‐level rise, the basin became deeper and wider, and sediments deposited on the lake shoulder at approximately 33 m below present‐day lake level point towards a long period of lake‐level highstand between roughly 53·5 ka cal. bp and 30 ka cal. bp with a maximum lake level some 200 m higher than the desiccation horizon. This highstand was then followed by a regressional phase of uncertain age, although it must have happened some time between approximately 30 ka cal. bp and 6750 yrs cal. bp. Dryer conditions during the Mid‐Holocene are evidenced by a dropping lake level, resulting in a basin‐wide erosional unconformity on the lake shoulder. A second stepwise transgression between ca 5·8 to 5·4 ka cal. bp and ca 4·7 to 4 ka cal. bp with palaeo‐shorelines deposited on the lake shoulder unconformity again indicates a change towards wetter conditions.

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Deciphering lake and maar geometries from seismic refraction and reflection surveys in Laguna Potrok Aike (southern Patagonia, Argentina)

Cited by 35 publications

References 16 publications

Influence of Methanogenic Populations in Holocene Lacustrine Sediments Revealed by Clone Libraries and Fatty Acid Biogeochemistry

Influence of Methanogenic Populations in Holocene Lacustrine Sediments Revealed by Clone Libraries and Fatty Acid Biogeochemistry

Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic

Seismic evidence of up to 200 m lake‐level change in Southern Patagonia since Marine Isotope Stage 4

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