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  • Springer  (4)
  • AGU (American Geophysical Union)  (3)
  • Blackwell Publishing Ltd  (1)
  • Universität Göttingen
  • 1990-1994  (8)
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Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Magnetostratigraphic Data From Late Quaternary Sediments From the Yermak Plateau, Arctic Ocean: Evidence For Four Geomagnetic Polarity Events Within the Last 170 Ka of the Brunhes Chron (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 117 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Palaeomagnetic investigations of two sediment cores recovered from RV Polarstern near the eastern slope of the Yermak Plateau (sites PS 1533 and PS 2212) reveal convincing evidence for four polarity events of the Earth's magnetic field during the last 170 Ka. A comprehensive rock magnetic study of the sediments proved that fine-grained magnetite is the principal carrier of the remanent magnetization. No changes in magneto-mineralogy across the polarity transitions in the sediments investigated were found. Calcareous nannofossil biostratigraphy, AMS-14C (accelerated mass spectrometry) and oxygen isotope data, and 10Be and 230Th stratigraphies yielded age ranges of 24–29 Ka for the Mono Lake event, 34–43 Ka for the Laschamp event, 72–86 Ka for the Norwegian-Greenland Sea event and 118–128 Ka for the Blake event. Two reverse polarity samples at the base of core PS 2212–3 KAL are interpreted as the termination of the Biwa I event (171-181 Ka). the events exhibit full inversion of inclination in both cores. the data suggest that the transition process of the Earth's magnetic field during such polarity events requires some 1 Ka.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03944.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Is there a relationship between atmospheric CO2 and manganese in the Ocean? (1994)
    Springer
    In:  In: Carbon cycling in the glacial ocean: Constraints in the ocean's role in global change. , ed. by Zahn, R., Pederson, T. F., Kannish, M. A. and Labeyrie, L. NATO ASI Series, 1 (17). Springer, Berlin, Germany, pp. 87-104. ISBN ISBN 0-387-57594-4
    Details
    Publication Date: 2020-04-14
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 3
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    Beryllium-10, thorium-231 and protactium-231 in Galapagos Microplate Sediments: implications of hydrothermal activity and paleoproductivity changes during the last 100.000 years (1994)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 9 (4). pp. 559-578.
    Details
    Publication Date: 2017-01-18
    Description: Biogenic particle fluxes from highly productive surface waters, boundary scavenging, and hydrothermal activity are the main factors influencing the deposition of radionuclides in the area of the Galapagos microplate, eastern Equatorial Pacific. In order to evaluate the importance of these three processes throughout the last 100 kyr, concentrations of the radionuclides 10Be, 230Th, and 231Pa, and of Mn and Fe were measured at high resolution in sediment samples from two gravity cores KLH 068 and KLH 093. High biological productivity in the surface waters overlying the investigated area has led to 10Be and 231Pa fluxes exceeding production during at least the last 30 kyr and probably the last 100 kyr. However, during periods of high productivity at the up welling centers off Peru and extension of the equatorial high-productivity zone, a relative loss of 10Be and 231Pa may have occurred in these sediment cores because of boundary scavenging. The effects of hydrothermal activity were investigated by comparing the 230Thex concentrations to the Mn/Fe ratios and by comparing the fluxes of 230Th and 10Be which exceed production. The results suggest an enhanced hydrothermal influence during isotope stages 4 and 5 and to a lesser extent during isotope stage 1 in core KLH 093. During isotope stages 2 and 3, the hydrothermal supply of Mn was deposited elsewhere, probably because of changes in current regime or deep water oxygenation. A strong increase of the Mn/Fe ratio at the beginning of climatic stage 1 which is not accompanied by an increase of the 230Thex concentration is interpreted to be an effect of Mn remobilization and reprecipitation in the sediment.
    Type: Article , PeerReviewed
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  • 4
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    Response of Manganese in the Ocean to the Climate Cycles in the Quaternary (1990)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 5 (5). pp. 811-821.
    Details
    Publication Date: 2017-05-10
    Description: Profiles of the 230Th concentration in Mn crusts from the central Pacific Ocean measured at extremely high depth resolution reveal that the growth rates of Mn crusts are influenced by climate. Based on a “constant flux model” the sections of maximum 230Th concentration correspond to periods of slow growth during glacial stages. Fast growth occurred during interglacial stages 1, 5, and 7, probably due to a larger supply of Mn oxides from the water column. High-resolution profiles of 230Th and 10Be in sediment cores from high biological productivity areas display radioisotope maxima in the interglacial stages and minima during glacial periods, the ratio of the fluxes of 10Be/230Th being ≥4. The only exceptions are observed at 135 and 270 kyr B.P., where the ratio of the fluxes is as low as 0.1 to 0.3. We presume that this “230Th anomaly” reflects short periods of time at the end of glacials when precipitation of MnO2 occurred. This hypothesis is confirmed by peaks of Mn observed in sediment cores mainly at the transitions from glacial to interglacial stages. The standing crops of Mn in these layers suggest release of Mn2+ from the sediments during glacial stages and buildup of Mn in the water column to concentrations of up to 10 µmol/L.
    Type: Article , PeerReviewed
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  • 5
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    Beryllium-10, thorium-231 and protactinium-231 in galapagos Microplate Sedimentes: implications of hydrothermal activity and paleoproductivity changes during the last 100.000 years (1994)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 9 (4). pp. 559-578.
    Details
    Publication Date: 2019-02-27
    Description: Biogenic particle fluxes from highly productive surface waters, boundary scavenging, and hydrothermal activity are the main factors influencing the deposition of radionuclides in the area of the Galapagos microplate, eastern Equatorial Pacific. In order to evaluate the importance of these three processes throughout the last 100 kyr, concentrations of the radionuclides 10Be, 230Th, and 231Pa, and of Mn and Fe were measured at high resolution in sediment samples from two gravity cores KLH 068 and KLH 093. High biological productivity in the surface waters overlying the investigated area has led to 10Be and 231Pa fluxes exceeding production during at least the last 30 kyr and probably the last 100 kyr. However, during periods of high productivity at the up welling centers off Peru and extension of the equatorial high-productivity zone, a relative loss of 10Be and 231Pa may have occurred in these sediment cores because of boundary scavenging. The effects of hydrothermal activity were investigated by comparing the 230Thex concentrations to the Mn/Fe ratios and by comparing the fluxes of 230Th and 10Be which exceed production. The results suggest an enhanced hydrothermal influence during isotope stages 4 and 5 and to a lesser extent during isotope stage 1 in core KLH 093. During isotope stages 2 and 3, the hydrothermal supply of Mn was deposited elsewhere, probably because of changes in current regime or deep water oxygenation. A strong increase of the Mn/Fe ratio at the beginning of climatic stage 1 which is not accompanied by an increase of the 230Thex concentration is interpreted to be an effect of Mn remobilization and reprecipitation in the sediment.
    Type: Article , PeerReviewed
    Format: text
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  • 6
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    Resonance Spectroskopy of Thorium (1993)
    Springer
    In:  Applied Physics B, 57 (2). pp. 109-112.
    Details
    Publication Date: 2020-04-14
    Description: Here we describe experiments aimed at developing an element-selective ion source for thorium (Th). The technique applied is resonance ionization spectroscopy (RIS) with a thermal atom beam. Ionization schemes for isotopically nonselective ionization of Th as well as for isotopically selective ionization of 230Th are proposed. The RIS-scheme used is two-photon two-colour ionization with excitation in the ultraviolet spectral range between 244 nm and 267 nm or in the visible spectral range between 485 nm and 529 nm. Ionization of the excited atoms is performed either by ultraviolet photons or by visible photons, depending on the energy required for this process.
    Type: Article , PeerReviewed
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  • 7
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    The Relevance of Manganese in the Ocean for the Climatic Cycles in the Quaternary (1990)
    Springer
    In:  Sitzungsberichte der Heidelberger Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Klasse, 1990,4 . Springer, Berlin, 31 pp. ISBN 3-540-52364-2
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    Publication Date: 2020-08-03
    Type: Book , NonPeerReviewed
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  • 8
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    Is there a relationship between atmospheric CO2 and manganese in the ocean (1993)
    Springer
    In:  In: Carbon Cycling in the glacial ocean: Constraints on the Ocean's Role in Global Change. , ed. by Zahn, R. Springer, Heidelberg, Germany, pp. 87-104.
    Details
    Publication Date: 2020-04-14
    Type: Book chapter , NonPeerReviewed
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