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Datasets of project "Potrok Aike Maar Lake Sediment Archive Drilling Project"

Mostrando recursos 1 - 20 de 24

  1. Rock-magnetic proxies from a sediment profile of Aike Lake

    Lisé-Pronovost, Agathe; St-Onge, Guillaume; Gogorza, Claudia; Haberzettl, Torsten; Jouve, Guillaume; Francus, Pierre; Ohlendorf, Christian; Gebhardt, Catalina; Zolitschka, Bernd
    The sedimentary archive from Laguna Potrok Aike is the only continuous record reaching back to the last Glacial period in continental southeastern Patagonia. Located in the path of the Southern Hemisphere westerly winds and in the source region of dust deposited in Antarctica during Glacial periods, southern Patagonia is a vantage point to reconstruct past changes in aeolian activity. Here we use high-resolution rock-magnetic and physical grain size data from site 2 of the International Continental scientific Drilling Program (ICDP) Potrok Aike maar lake Sediment Archive Drilling prOject (PASADO) in order to develop magnetic proxies of dust and wind intensity...

  2. Millennial timescale variability of rock-magnetic properties of Laguna Potrok Aike sediment

    Lisé-Pronovost, Agathe; St-Onge, Guillaume; Gogorza, Claudia; Haberzettl, Torsten; Jouve, Guillaume; Francus, Pierre; Ohlendorf, Christian; Gebhardt, Catalina; Zolitschka, Bernd

  3. Rock-magnetic properties of Laguna Potrok Aike sediment vs depth and age in full resolution

    Lisé-Pronovost, Agathe; St-Onge, Guillaume; Gogorza, Claudia; Haberzettl, Torsten; Jouve, Guillaume; Francus, Pierre; Ohlendorf, Christian; Gebhardt, Catalina; Zolitschka, Bernd

  4. Geomicrobiology, bulk sediment characteristics and pore water chemistry of sediment cores from Laguna Potrok Aike, southern Patagonia

    Vuillemin, Aurèle; Ariztegui, Daniel; Mayr, Christoph; Lücke, Andreas
    Authigenic minerals can form in the water column and sediments of lakes, either abiotically or mediated by biological activity. Such minerals have been used as paleosalinity and paleoproductivity indicators and reflect trophic state and early diagenetic conditions. They are also considered potential indicators of past and perhaps ongoing microbial activity within sediments. Authigenic concretions, including vivianite, were described in late glacial sediments of Laguna Potrok Aike, a maar lake in southernmost Argentina. Occurrence of iron phosphate implies specific phosphorus sorption behavior and a reducing environment, with methane present. Because organic matter content in these sediments was generally low during glacial...

  5. Bulk sediment characteristics and geomicrobiology of sediment core 5022-1J from Laguna Potrok Aike, southern Patagonia

    Vuillemin, Aurèle; Ariztegui, Daniel
    Living microorganisms inhabit every environment of the biosphere but only in the last decades their importance governing biochemical cycles in deep sediments has been widely recognized. Most investigations have been accomplished in the marine realm whereas there is a clear paucity of comparable studies in lacustrine sediments. One of the main challenges is to define geomicrobiological proxies that can be used to identify different microbial signals in the sediments. Laguna Potrok Aike, a maar lake located in Southeastern Patagonia, has an annually not stratifying cold water column with temperatures ranging between 4 and 10 °C, and most probably an anoxic...

  6. Bulk sediment characteristics and geomicrobiology of sediment core 5022-1D from Laguna Potrok Aike, southern Patagonia

    Vuillemin, Aurèle; Ariztegui, Daniel; Mayr, Christoph; Lücke, Andreas

  7. Pore water chemistry of sediment core 5022-1A from Laguna Potrok Aike, southern Patagonia

    Vuillemin, Aurèle; Ariztegui, Daniel; Mayr, Christoph; Lücke, Andreas

  8. (Table 2) AMS radiocarbon ages from composite core 5022-2CP of Laguna Potrok Aike, southern Patagonia

    Kliem, Pierre; Enters, Dirk; Hahn, Annette; Ohlendorf, Christian; Lisé-Pronovost, Agathe; St-Onge, Guillaume; Wastegard, Stefan; Zolitschka, Bernd; PASADO Science Team

  9. (Table 1) Major element composition of core 5022-2CP, Laguna Potrok Aike, southern Patagonia

    Hahn, Annette; Kliem, Pierre; Ohlendorf, Christian; Zolitschka, Bernd; Rosén, Peter; PASADO Science Team
    Total organic carbon, total inorganic carbon, biogenic silica content and total organic carbon/total nitrogen ratios of the Laguna Potrok Aike lacustrine sediment record are used to reconstruct the environmental history of south-east Patagonia during the past 51 ka in high resolution. High lake level conditions are assumed to have prevailed during the Last Glacial, as sediments are carbonate-free. Increased runoff linked to permafrost and reduced evaporation due to colder temperatures and reduced influence of Southern Hemispheric Westerlies (SHW) may have caused these high lake levels with lake productivity being low and organic matter mainly of algal or cyanobacterial origin. Aquatic...

  10. Age-depth relation, radiocarbon ages and tephra geochemistry of core 5022-2CP from Laguna Potrok Aike, southern Patagonia

    Kliem, Pierre; Enters, Dirk; Hahn, Annette; Ohlendorf, Christian; Lisé-Pronovost, Agathe; St-Onge, Guillaume; Wastegard, Stefan; Zolitschka, Bernd; PASADO Science Team
    The 106 m long composite profile from site 2 of ICDP expedition 5022 (PASADO) at Laguna Potrok Aike documents a distinct change in sedimentation patterns from pelagic sediments at the top to dominating mass movement deposits at its base. The main lithological units correspond to the Holocene, to the Lateglacial and to the last glacial period and can be interpreted as the result of distinct environmental variations. Overflow conditions might have been achieved during the last glacial period, while signs of desiccation are absent in the studied sediment record. Altogether, 58 radiocarbon dates were used to establish a consistent age-depth...

  11. (Table 1) Major element oxides of tephra layers from composite core 5022-2CP, Laguna Potrok Aike, southern Patagonia

    Kliem, Pierre; Enters, Dirk; Hahn, Annette; Ohlendorf, Christian; Lisé-Pronovost, Agathe; St-Onge, Guillaume; Wastegard, Stefan; Zolitschka, Bernd; PASADO Science Team

  12. (Supplement) Age-depth relation of composite core 5022-2CP from Laguna Potrok Aike, southern Patagonia

    Kliem, Pierre; Enters, Dirk; Hahn, Annette; Ohlendorf, Christian; Lisé-Pronovost, Agathe; St-Onge, Guillaume; Wastegard, Stefan; Zolitschka, Bernd; PASADO Science Team

  13. Microsedimentological characterization as indicators of sedimentary processes and climate changes during Lateglacial at Laguna Potrok Aike, Santa Cruz, Argentina

    Jouve, Guillaume; Francus, Pierre; Lamoureux, Scott; Provencher-Nolet, Laurence; Hahn, Annette; Haberzettl, Torsten; Fortin, David; Nuttin, Laurence; PASADO Science Team
    Palaeoclimatic and paleoenvironmental high latitude records in the Southern Hemisphere are scarce compared to the northern counterpart. However, understanding global evolution of environmental systems during sudden climate changes is inseparable from an equivalent knowledge of both Hemispheres. In this context, a high-resolution study of lacustrine sediments from Laguna Potrok Aike, Santa Cruz province, Patagonia, Argentina, was conducted for the Lateglacial period using concurrent X-Ray Fluorescence (XRF) and Scanning electron microscope analyses. Peaks of Ca/Si and Mn, and occurrences of the green alga Phacotus lenticularis have been interpreted as variations in ventilation of the water column from 13.6 to 11.1 ka...

  14. (Table 1) Grain size results of Laguna Potrok Aike sediments

    Jouve, Guillaume; Francus, Pierre; Lamoureux, Scott; Provencher-Nolet, Laurence; Hahn, Annette; Haberzettl, Torsten; Fortin, David; Nuttin, Laurence; PASADO Science Team

  15. Grain size composition of micropumice in Laguna Potrok Aike sediments

    Jouve, Guillaume; Francus, Pierre; Lamoureux, Scott; Provencher-Nolet, Laurence; Hahn, Annette; Haberzettl, Torsten; Fortin, David; Nuttin, Laurence; PASADO Science Team

  16. Grain size composition of Laguna Potrok Aike sediments

    Jouve, Guillaume; Francus, Pierre; Lamoureux, Scott; Provencher-Nolet, Laurence; Hahn, Annette; Haberzettl, Torsten; Fortin, David; Nuttin, Laurence; PASADO Science Team

  17. Geochemistry of Laguna Potrok Aike sediments

    Jouve, Guillaume; Francus, Pierre; Lamoureux, Scott; Provencher-Nolet, Laurence; Hahn, Annette; Haberzettl, Torsten; Fortin, David; Nuttin, Laurence; PASADO Science Team

  18. Age determination and paleomagnetic investigations on a sediment profile from laguna Potrok Aike

    Lisé-Pronovost, Agathe; St-Onge, Guillaume; Gogorza, Claudia; Haberzettl, Torsten; Preda, Michel; Kliem, Pierre; Francus, Pierre; Zolitschka, Bernd; PASADO Science Team
    Paleomagnetic inclination, declination and relative paleointensity were reconstructed from the sediments of Laguna Potrok Aike in the framework of the International Continental scientific Drilling Program (ICDP) Potrok Aike maar lake Sediment Archive Drilling prOject (PASADO). Here we present the u-channel-based full vector paleomagnetic field reconstruction since 51.2 ka cal BP. The relative paleointensity proxy (RPI) was built by normalising the natural remanent magnetisation with the anhysteretic remanent magnetisation using the average ratio at 4 demagnetisation steps part of the ChRM interval (NRM/ARM10e40 mT). A grain size influence on the RPI was removed using a correction based on the linear relationship...

  19. Table 1. AMS radiocarbon ages for the PASADO-ICDP site 2 sedimentary record from Laguna Potrok Aike

    Lisé-Pronovost, Agathe; St-Onge, Guillaume; Gogorza, Claudia; Haberzettl, Torsten; Preda, Michel; Kliem, Pierre; Francus, Pierre; Zolitschka, Bernd; PASADO Science Team

  20. High-resolution paleomagnetic secular variation and relative paleointensity since the Late Pleistocene in Southern South America

    Lisé-Pronovost, Agathe; St-Onge, Guillaume; Gogorza, Claudia; Haberzettl, Torsten; Preda, Michel; Kliem, Pierre; Francus, Pierre; Zolitschka, Bernd; PASADO Science Team

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