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  • ddc:550.724  (2)
  • Atlantischer Raum Nord  (1)
  • English  (3)
  • 2020-2023  (2)
  • 1980-1984  (1)
  • 1955-1959
  • 1940-1944
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  • English  (3)
Years
  • 2020-2023  (2)
  • 1980-1984  (1)
  • 1955-1959
  • 1940-1944
  • 2020-2024  (1)
Year
  • 1
    Unknown
    Variscan Tectonics of the North Atlantic Region (1984)
    Oxford, London, Edinburgh, Boston, Melbourne, Palo Alto : Blackwell Scientific Publications
    Details
    Keywords: Variszische Faltungsära ; Atlantischer Raum Nord ; Historische Geologie
    Description / Table of Contents: Mainland Europe --- K. Weber: Variscan events: early Palaeozoic continental rift metamorphism and late Palaeozoic crustal shortening / Geological Society, London, Special Publications, 14:3-22, doi:10.1144/GSL.SP.1984.014.01.02 --- R. Meissner, M. Springer, and E. Flüh: Tectonics of the Variscides in North-Western Germany based on seismic reflection measurements / Geological Society, London, Special Publications, 14:23-32, doi:10.1144/GSL.SP.1984.014.01.03 --- Wolfgang Franke: Late events in the tectonic history of the Saxothuringian zone / Geological Society, London, Special Publications, 14:33-45, doi:10.1144/GSL.SP.1984.014.01.04 --- J. P. Burg, Ph. Matte, A. Leyreloup, and J. Marchand: Inverted metamorphic zonation and large-scale thrusting in the Variscan Belt: an example in the French Massif Central / Geological Society, London, Special Publications, 14:47-61, doi:10.1144/GSL.SP.1984.014.01.05 --- Jean-Michel Quenardel and Patrick Rolin: Palaeozoic evolution of the Plateau d’Aigurande (NW Massif Central, France) / Geological Society, London, Special Publications, 14:63-70, doi:10.1144/GSL.SP.1984.014.01.06 --- S. C. Matthews: Northern margins of the Variscides in the North Atlantic region: comments on the tectonic context of the problem / Geological Society, London, Special Publications, 14:71-85, doi:10.1144/GSL.SP.1984.014.01.07 --- Britain --- M. P. Coward and S. Smallwood: An interpretation of the Variscan tectonics of SW Britain / Geological Society, London, Special Publications, 14:89-102, doi:10.1144/GSL.SP.1984.014.01.08 --- B. E. Leveridge, M. T. Holder, and G. A. Day: Thrust nappe tectonics in the Devonian of south Cornwall and the western English Channel / Geological Society, London, Special Publications, 14:103-112, doi:10.1144/GSL.SP.1984.014.01.09 --- T. J. Chapman, R. L. Fry, and P. T. Heavey: A structural cross-section through SW Devon / Geological Society, London, Special Publications, 14:113-118, doi:10.1144/GSL.SP.1984.014.01.10 --- J. W. F. Edwards: Interpretations of seismic and gravity surveys over the eastern part of the Cornubian platform / Geological Society, London, Special Publications, 14:119-124, doi:10.1144/GSL.SP.1984.014.01.11 --- Robert M. Shackleton: Thin-skinned tectonics, basement control and the Variscan front / Geological Society, London, Special Publications, 14:125-129, doi:10.1144/GSL.SP.1984.014.01.12 --- Russell S. Arthurton: The Ribblesdale fold belt, NW England—a Dinantian-early Namurian dextral shear zone / Geological Society, London, Special Publications, 14:131-138, doi:10.1144/GSL.SP.1984.014.01.13 --- M. F. Critchley: Variscan tectonics of the Alston block, northern England / Geological Society, London, Special Publications, 14:139-146, doi:10.1144/GSL.SP.1984.014.01.14 --- Ireland --- David J. Sanderson: Structural variation across the northern margin of the Variscides in NW Europe / Geological Society, London, Special Publications, 14:149-165, doi:10.1144/GSL.SP.1984.014.01.15 --- M. A. Cooper, D. Collins, M. Ford, F. X. Murphy, and P. M. Trayner: Structural style, shortening estimates and the thrust front of the Irish Variscides / Geological Society, London, Special Publications, 14:167-175, doi:10.1144/GSL.SP.1984.014.01.16 --- M. D. Max and J. P. Lefort: Does the Variscan front in Ireland follow a dextral shear zone? / Geological Society, London, Special Publications, 14:177-183, doi:10.1144/GSL.SP.1984.014.01.17 --- D. W. Coller: Variscan structures in the Upper Palaeozoic rocks of west central Ireland / Geological Society, London, Special Publications, 14:185-194, doi:10.1144/GSL.SP.1984.014.01.18 --- North America --- N. Rast: The Alleghenian orogeny in eastern North America / Geological Society, London, Special Publications, 14:197-217, doi:10.1144/GSL.SP.1984.014.01.19 --- Jean-Pierre Lefort and Richard T. Haworth: Geophysical evidence for the extension of the Variscan front on to the Canadian continental margin: geodynamic and palaeogeographic consequences / Geological Society, London, Special Publications, 14:219-231, doi:10.1144/GSL.SP.1984.014.01.20 --- Sharon Mosher and Nicholas Rast: The deformation and metamorphism of Carboniferous rocks in Maritime Canada and New England / Geological Society, London, Special Publications, 14:233-243, doi:10.1144/GSL.SP.1984.014.01.21 --- R. P. Wintsch and J.-P. Lefort: A clockwise rotation of Variscan strain orientation in SE New England and regional implications / Geological Society, London, Special Publications, 14:245-251, doi:10.1144/GSL.SP.1984.014.01.22 --- J. A. Brewer: Clues to the deep structure of the European Variscides from crustal seismic profiling in North America / Geological Society, London, Special Publications, 14:253-263, doi:10.1144/GSL.SP.1984.014.01.23
    Pages: Online-Ressource (IX, 270 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 063201203X
    URL: http://sp.lyellcollection.org/content/14/1
    Language: English
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    E-BOOK
  • 2
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    Comparison of Denitrification Induced by Various Organic Substances—Reaction Rates, Microbiology, and Temperature Effect (2021)
    Details
    Publication Date: 2022-04-04
    Description: Widespread groundwater pollution with nitrate (NO3−) and the finite and decreasing geogenic NO3− degradation capacity in aquifers require a better understanding of potential treatment methods. This project aimed at exploring and comparing the efficiency of four organic substances as electron donors for heterotrophic denitrification. Circulation column experiments using sediment without NO3− degradation capacity and high agricultural NO3− groundwater were conducted. Acetate, glucose, ascorbic acid, and ethanol were added to these columns in three concentration steps to induce biological denitrification, whereby also temperature dependence of denitrification rates (room temperature and typical groundwater temperature of 10°C) was taken into account. Results show denitrification with all four carbon (C) sources with intensities varying considerably between electron donors. Comparison of the two temperature approaches shows substantial differences between applied organic substances and indicates T as an important variable for denitrification. Ethanol is clearly the most effective electron donor for biodenitrification in groundwater investigated in this study, with a stronger and more effective NO3− degradation at 10°C than at room temperature. In contrast, much higher reaction rates are achieved with glucose at room temperature, compared to 10°C. Denitrification with ascorbic acid is very low at both temperatures; its addition produces biomass which repeatedly led to column clogging. In the entire test series, nitrite (NO2−) accumulation occurred more frequently and in higher concentrations at 10°C. Analysis of microorganisms shows a strong modification in microbial community in reaction to the addition of different organic C as well as between the two temperature approaches.
    Description: Key Points: Higher denitrification rate with ethanol at 10°C, consequently, reaction kinetics does not generally increase with rising temperature. Addition of organic substances and temperature strongly modify the denitrifying microbial community. Electron donor selection for induced nitrate reduction depends on the groundwater temperature of the region.
    Description: Deutsche Forschungsgemeinschaft (DFG) http://dx.doi.org/10.13039/501100001659
    Keywords: ddc:553.79 ; ddc:550.724 ; ddc:628.162
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 3
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    Thickness of Fluvial Deposits Records Climate Oscillations (2022)
    Details
    Publication Date: 2022-08-04
    Description: Fluvial deposits offer Earth’s best‐preserved geomorphic record of past climate change over geological timescales. However, quantitatively extracting this information remains challenging in part due to the complexity of erosion, sediment transport and deposition processes and how each of them responds to climate. Furthermore, sedimentary basins have the potential to temporarily store sediments, and rivers subsequently rework those sediments. This may introduce time lags into sedimentary signals and obscure any direct correlation with climate forcing. Here, using a numerical model that combines all three processes—and a new analytical solution—we show that the thickness of fluvial deposits at the outlet of a mountain river can be linked to the amplitude and period of rainfall oscillations but is modulated by the mountain uplift rate. For typical uplift rates of a few mm/yr, climate oscillations at Milankovitch periods lead to alluvial sediment thickness of tens of meters as observed in nature. We also explain the time lag of the order of 20%–25% of the forcing period that is commonly observed between the timing of maximum rainfall and erosion. By comparing to field datasets, our predictions for the thickness and time lag of fluvial deposits are broadly consistent with observations despite the simplicity of our modeling approach. These findings provide a new theoretical framework for quantitatively extracting information on past rainfall variations from fluvial deposits.
    Description: Plain Language Summary: Climate influences the evolution of terrestrial landscapes through the amount of precipitation, which provides water to erode rocks and transport sediment in rivers. At the outlets of mountain ranges, rivers can deposit part of their sediment load; the shape of the deposits is influenced by the amount of flow in the rivers. If the climate changes such that the precipitation rate increases, rivers can cut into their own previous deposits. The remaining deposits are then abandoned above the riverbed. On the contrary, if precipitation decreases, rivers tend to deposit more sediment, leading to increases in the thickness of sediments at the outlets of mountain rivers. Thus, there is a relationship between the amount of precipitations and the thickness of sediments deposited at river outlets. We study this with a computer model that allows us to relate the variations in precipitation rates to variations in thickness of fluvial terrace deposits. This work can be used to better understand how rivers respond to climatic changes, and also to reconstruct climatic variations of the past from observed river deposits.
    Description: Key Points: We use a numerical model and a new analytical solution to quantify a physical link between fluvial deposits and climate oscillations. Our method provides a theoretical framework for extracting information on past climate variations from fluvial terrace deposits. Our results explain time lag of 20%–25% of forcing period commonly observed between the timing of maximum rainfall and erosion.
    Description: TOTAL
    Description: Marie Sklodowska‐Curie grant
    Description: https://doi.org/10.5281/zenodo.3833983
    Keywords: ddc:550.724
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
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