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  • 1.
    Andrén, Thomas
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    The Younger Dryas - Pre-boreal transition as recorded in vared glacial clay sequences in the north-western Baltic Proper1996Ingår i: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 118, s. A79-Artikel i tidskrift (Refereegranskat)
  • 2.
    Andrén, Thomas
    Stockholm University.
    Till stratigraphy and ice recession in the Bothnian Bay1990Doktorsavhandling, monografi (Övrigt vetenskapligt)
  • 3.
    Andrén, Thomas
    et al.
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Andrén, Elinor
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Did The Storegga tsunami affect the Baltic Sea?2001Ingår i: Baltica: an International Yearbook for Quaternary Geology and Palaeogeography, Coastal Morphology and Shore Processes, Marine Geology and Recent Tectonics of the Baltic Sea Area, ISSN 0067-3064, E-ISSN 1648-858X, Vol. 14, s. 115-123Artikel i tidskrift (Refereegranskat)
  • 4.
    Andrén, Thomas
    et al.
    Södertörns högskola, Institutionen för livsvetenskaper, Miljövetenskap.
    Barker Jørgensen, Bo
    Aarhus University, Denmark.
    Cotterill, Carlo
    British Geological Survey, UK.
    Morgan, Sally
    University of Leicester, UK.
    IODP Expedition 347:Paleoenvironmental evolution of the Baltic Sea Basin through the last glacial cycle2012Ingår i: ECORD Newsletter, ISSN 2264-1556, nr 19, s. 14-15, 23Artikel i tidskrift (Övrigt vetenskapligt)
  • 5.
    Andrén, Thomas
    et al.
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Brunnberg, Lars
    Ringberg, Bertil
    The Reactivated Geochronological Institute in Stockholm - The First Clay-varve Database1995Ingår i: Journal of European Study Group on Physical, Chemical, Biological and Mathematical Techniques applied on Archaeology (PACT), ISSN 0257-8727, Vol. 50, s. 213-218Artikel i tidskrift (Refereegranskat)
  • 6.
    Andrén, Thomas
    et al.
    Södertörns högskola, Institutionen för livsvetenskaper.
    Jørgensen, Bo Barker
    Aarhus University, Aarhus, Denmark.
    Cotterill, Carol
    British Geological Survey Murchison House, Edinburgh, UK.
    Baltic Sea Basin Paleoenvironment: Paleoenvironmental evolution of the Baltic Sea Basinthrough the last glacial cycle2012Ingår i: IODP Scientific Prospectus 347Artikel, forskningsöversikt (Övrigt vetenskapligt)
  • 7.
    Andrén, Thomas
    et al.
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Jørgensen, Bo Barker
    Cotterill, Carol
    Green, Sophie
    IODP expedition 347: Baltic Sea basin paleoenvironment and biosphere2015Ingår i: Scientific Drilling, ISSN 1816-8957, E-ISSN 1816-3459, Vol. 20, s. 1-12Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Integrated Ocean Drilling Program (IODP) expedition 347 cored sediments from different settings of the Baltic Sea covering the last glacial–interglacial cycle. The main aim was to study the geological development of the Baltic Sea in relation to the extreme climate variability of the region with changing ice cover and major shifts in temperature, salinity, and biological communities. Using the Greatship Manisha as a European Consortium for Ocean Research Drilling (ECORD) mission-specific platform, we recovered 1.6 km of core from nine sites of which four were additionally cored for microbiology. The sites covered the gateway to the North Sea and Atlantic Ocean, several sub-basins in the southern Baltic Sea, a deep basin in the central Baltic Sea, and a river estuary in the north.

     

    The waxing and waning of the Scandinavian ice sheet has profoundly affected the Baltic Sea sediments. During theWeichselian, progressing glaciers reshaped the submarine landscape and displaced sedimentary deposits from earlier Quaternary time. As the glaciers retreated they left a complex pattern of till, sand, and lacustrine clay, which in the basins has since been covered by a thick deposit of Holocene, organic-rich clay. Due to the stratified water column of the brackish Baltic Sea and the recurrent and widespread anoxia, the deeper basins harbor laminated sediments that provide a unique opportunity for high-resolution chronological studies.

     

    The Baltic Sea is a eutrophic intra-continental sea that is strongly impacted by terrestrial runoff and nutrient fluxes. The Holocene deposits are recorded today to be up to 50m deep and geochemically affected by diagenetic alterations driven by organic matter degradation. Many of the cored sequences were highly supersaturated with respect to methane, which caused strong degassing upon core recovery. The depth distributions of conservative sea water ions still reflected the transition at the end of the last glaciation from fresh-water clays to Holocene brackish mud. High-resolution sampling and analyses of interstitial water chemistry revealed the intensive mineralization and zonation of the predominant biogeochemical processes. Quantification of microbial cells in the sediments yielded some of the highest cell densities yet recorded by scientific drilling.

  • 8.
    Andrén, Thomas
    et al.
    Södertörns högskola, Institutionen för livsvetenskaper.
    Jørgensen, Bo Barker
    Aarhus University, Aarhus, Denmark.
    Cotterill, Carol
    ECORD Science Operator, British Geological Survey, Murchison House, Edinburgh, UK.
    Morgan, Sally
    University of Leicester, Leicester, UK.
    IODP Expedition 347: Paleoenvironmental evolution of the Baltic Sea Basin trough the last glacial cycle2012Ingår i: ECORD Newsletter, nr 19 October, s. 14-15+ s.23Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 9.
    Andrén, Thomas
    et al.
    Stockholm University.
    Lindeberg, Greger
    A shallow refraction seismic survey at Björkö eastern Sweden: a pilot study1997Ingår i: Environment and Vikings: with special reference to Birka / [ed] Björn Ambrosiani; Helen Clarke; Tony Hackens; Ann-Marie Hansson; Brigitta Johansson, Rixensart: Conseil de l'Europe , 1997, s. 175-188Konferensbidrag (Refereegranskat)
  • 10.
    Andrén, Thomas
    et al.
    Stockholm University.
    Risberg, Jan
    Late Quaternary development of the north-western Baltic Proper: An introduction1994Ingår i: Laminated sediments: symposium held at the European University Centre for Cultural Heritage, Ravello, June, 1991 / [ed] Sheila Hicks; Urve Miller; Matti Saarnisto, Rixensart: Conseil de l'Europe , 1994, s. 35-43Konferensbidrag (Refereegranskat)
  • 11.
    Andrén, Thomas
    et al.
    Stockholm University.
    Sohlenius, Gustav
    Clay-varve chronology and magnetic stratigraphy in the north-western Baltic Proper1995Ingår i: Proceedings of the Third Marine Geological Conference "The Baltic" / [ed] Józef Edward Mojski, Warszawa: Państwowy Inst. Geologiczny , 1995, s. 78-83Konferensbidrag (Refereegranskat)
  • 12. Andrén, Thomas
    et al.
    Wannäs, Kjell
    Late Quaternary development of the Bornholm Gatt1988Ingår i: Geological Survey of Finland Special Paper, ISSN 0782-8535, Vol. 6, s. 23-30Artikel i tidskrift (Refereegranskat)
  • 13.
    Green, Paul F.
    et al.
    Geotrack International Pty Ltd, West Brunswick, Australia.
    Duddy, Ian R.
    Geotrack International Pty Ltd, West Brunswick, Australia.
    Japsen, Peter
    Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark.
    Bonow, Johan M.
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Geografi. Mid-Sweden University.
    Malan, Jean A.
    New Age (African Global Energy) Ltd, London, UK.
    Post-breakup burial and exhumation of the southern margin of Africa2017Ingår i: Basin Research, ISSN 0950-091X, E-ISSN 1365-2117, Vol. 29, nr 1, s. 96-127Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Despite many years of study, the processes involved in the development of the continental margin of southern Africa and the distinctive topography of the hinterland remain poorly understood. Previous thermochronological studies carried out within a monotonic cooling framework have failed to take into account constraints provided by Mesozoic sedimentary basins along the southern margin. We report apatite fission track analysis and vitrinite reflectance data in outcrop samples from the Late Jurassic to Early Cretaceous sedimentary fill of the Oudtshoorn, Gamtoos and Algoa Basins (Uitenhage Group), as well as isolated sedimentary remnants further west, plus underlying Paleozoic rocks (Cape Supergroup) and Permian-Triassic sandstones from the Karoo Supergroup around the Great Escarpment. Results define a series of major regional cooling episodes. Latest Triassic to Early Jurassic cooling which began between 205 and 180 Ma is seen dominantly in basement flanks to the Algoa and Gamtoos Basins. This episode may have affected a wider region but in most places any effects have been overprinted by later events. The effects of Early Cretaceous (beginning between 145 and 130 Ma) and Early to mid-Cretaceous (120-100 Ma) cooling are both delimited by major structures, while Late Cretaceous (85-75 Ma) cooling appears to have affected the whole region. These cooling events are all interpreted as dominantly reflecting exhumation. Higher Late Cretaceous paleotemperatures in samples from the core of the Swartberg Range, coupled with evidence for localised Cenozoic cooling, are interpreted as representing Cenozoic differential exhumation of the mountain range. Late Cretaceous paleotemperatures between 60 degrees C and 90 degrees C in outcropping Uitenhage Group sediments from the Oudtshoorn, Gamtoos and Algoa Basins require burial by between 1.2 and 2.2 km prior to Late Cretaceous exhumation. Because these sediments lie in depositional contact with underlying Paleozoic rocks in many places, relatively uniform Late Cretaceous paleotemperatures across most of the region, in samples of both basin fill and underlying basement, suggest the whole region may have been buried prior to Late Cretaceous exhumation. Cenozoic cooling (beginning between 30 and 20 Ma) is focussed mainly in mountainous regions and is interpreted as representing denudation which produced the modern-day relief. Features such as the Great Escarpment are not related to continental break up, as is often supposed, but are much younger (post-30 Ma). This history of post-breakup burial and subsequent episodic exhumation is very different from conventional ideas of passive margin evolution, and requires a radical re-think of models for development of continental margins.

  • 14.
    Hall, Adrian M
    et al.
    Stockholm University, Department of Physical Geography.
    Ebert, Karin
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Goodfellow, Bradley W
    Sveriges Geologiska Undersökning.
    Hättestrand, Clas
    Stockholm University, Department of Physical Geography.
    Heyman, Jakob
    University of Gothenburg, Department of Earth Sciences.
    Krabbendam, Maarten
    British Geological Survey.
    Moon, Seulgi
    University of California, Department of Earth, Planetary and Space Sciences.
    Stroeven, Arjen P
    Stockholm University, Department of Physical Geography.
    Past and future impact of glacial erosion in Forsmark and Uppland: final report2019Rapport (Refereegranskat)
  • 15. Sohlenius, Gustav
    et al.
    Andrén, Thomas
    Development of the north-western Baltic Proper efter the Weichselain deglaciation1995Ingår i: Proceedings of the third Marine geological conference "The Baltic": Trzecia konferencja geologii morza "Bałtyk" zbiór referatów / [ed] Józef Edward Mojski, Warszawa, 1995, s. 71-77Konferensbidrag (Refereegranskat)
  • 16.
    Stepanova, A.
    et al.
    Texas A&M University, College Station, USA.
    Obrochta, S.
    Akita University, Akita, Japan.
    Quintana Krupinski, N. B.
    Lund University.
    Hyttinen, O.
    University of Helsinki, Helsinki, Finland.
    Kotilainen, A.
    Geological Survey of Finland, Marine Geology, Espoo, Finland.
    Andrén, Thomas
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Late Weichselian to Holocene history of the Baltic Sea as reflected in ostracod assemblages2019Ingår i: Boreas, ISSN 0300-9483, E-ISSN 1502-3885, Vol. 48, nr 3, s. 761-778Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The study presents the first description and analysis of ostracod records from three sites cored in different parts of the Baltic Sea during the IODP Expedition 347, Baltic Sea Paleoenvironment. Our data present the first high-resolution ostracod records from the Late Weichselian and Holocene sediments collected across the Baltic Sea Basin. Using published data on modern ostracod species ecology of the Baltic Sea, we were able to provide ostracod-based palaeoreconstructions of the history of the region. The stratigraphical framework for the sites is based on radiocarbon-based age models. The three studied sites reveal different ostracod assemblage successions that reflect environmental changes in the study area. Site M0060, located in the Kattegat area, contains the oldest ostracod assemblages that document a marine environment with very high sedimentation rates during the most recent deglaciation. Between ~13 000 and 7500 cal. a BP a modern-like near-shore environment developed. Site M0059 in the southwestern Baltic Sea, Little Belt area, contains assemblages reflecting the transition from a freshwater lake to the brackish Littorina Sea between ~7500 and 7300 cal. a BP. Site M0063 is the deepest location in the central Baltic, Landsort Deep, and yielded very limited ostracod data, but comparison with our organic carbon data allowed us to distinguish the Yoldia Sea, Ancylus Lake and Littorina Sea intervals. The ostracod record correlates well with the organic carbon record with alternation between periods of hypoxia and periods of low oxygen that still supported ostracods.

1 - 16 av 16
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