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

Mostrando recursos 1 - 20 de 50

  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. 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...

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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...

  8. 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...

  9. 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...

  10. 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...

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

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

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

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

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

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

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

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

  15. (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

  16. (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

  17. (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

  18. (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...

  19. (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...

  20. 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...

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