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@PHDTHESIS{Kloppisch:1312,
      author       = {Kloppisch, Marina},
      title        = {{O}rganic matter in {L}ate {D}evonian sediments as an
                      indicator for environmental changes},
      volume       = {13},
      issn         = {1866-1793},
      school       = {RWTH Aachen},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-1312},
      isbn         = {978-3-89336-534-0},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {XII, 188 S.},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012; Aachen, RWTH, Diss,
                      2008},
      abstract     = {In order to reveal the peculiarities distinguishing the
                      geochemical differentiation of the organic matter during the
                      Late Devonian, sediment cores from the Rhenish, Michigan and
                      Appalachian Basins have been investigated. In the late
                      Frasnian two major extinction events took place: the Lower
                      and the Upper Kellwasser Event. The latter was one of the
                      most striking mass extinction events in the Phanerozoic;
                      (Sepkoski, 1996; Walliser, 1996). Although the effects of
                      these events on the invertebrate fauna are well known
                      (Schindler, 1990), information related to the evolution of
                      the phytoplankton is limited. Sedimentary rocks from the
                      above cited profiles were inspected with optical microscopy
                      and investigated for organic geochemical bulk parameters,
                      selected trace metals, carbon and nitrogen isotopy as well
                      as extractable biomarkers. To obtain reliable results from
                      the geochemical analyses, the processing of nonweathered
                      samples with low maturity is required. The results of the
                      maturity investigations classified the material as - at the
                      most - only marginal mature and a redistribution of soluble
                      organic matter has been considered very unlikely. The
                      Devonian time was outstanding due to the evolution of the
                      land plants which have influenced nearly all environmental
                      factors such as climate, sea level and redox conditions. The
                      covering of terrestrial areas by plants caused drastic
                      transformations in respect to geosphere, hydrosphere and
                      atmosphere (Walliser, 1996). Depending on the input of
                      nutrients into the oceans and on the subsequent
                      phytoplankton bloom, the palaeoredox conditions and the
                      amount of burial of organic carbon have been affected. The
                      perturbations of the carbon dioxide level in the atmosphere
                      and in the water modified the climate and therefore the sea
                      level which influenced the water circulation and oxygen
                      supply and thus the living conditions within the oceans.
                      Information regarding the sources of organic material
                      specified whether it originated from terrestrial or marine
                      components and consisted of bacteria or algae. Pristane/
                      phytane ratio and selected trace element ratios unveiled the
                      redox conditions within the sediments. Aryl isoprenoids gave
                      the opportunity to understand the palaeoredox conditions
                      within the water column. Moreover, the nitrogen isotopy
                      delivered information regarding the nutrient supply. Another
                      isotopic analysis (δ$^{13}$C$_{org}$) was focused to test
                      the global character of the positive carbon isotope shifts
                      within numerous other Upper Devonian profiles. Exploiting
                      these results, the productivity of the oceans and the
                      environmental conditions during the Late Devonian have been
                      successfully reconstructed. Furthermore, possible causes for
                      the mass extinction have been discussed in more detail.},
      cin          = {ICG-4},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/1312},
}