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  • PANGAEA  (88)
  • Nature Publishing Group  (5)
  • Geological Society of America (GSA)
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  • 1
    Electronic Resource
    Electronic Resource
    Possible solar origin of the 1,470-year glacial climate cycle demonstrated in a coupled model (2005)
    [s.l.] : Nature Publishing Group
    Nature 438 (2005), S. 208-211 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many palaeoclimate records from the North Atlantic region show a pattern of rapid climate oscillations, the so-called Dansgaard–Oeschger events, with a quasi-periodicity of ∼1,470 years for the late glacial period. Various hypotheses have been suggested to explain these rapid ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04121
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Co-fluxes and growth rates in ferromanganese deposits from central Pacific seamount areas (1983)
    [s.l.] : Nature Publishing Group
    Nature 304 (1983), S. 716-719 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In early diagenetic and mixed type nodules Co displays a positive correlation with Fe (r = 0.77)3 and no correlation to Mn, whereas in hydrogenetic nodules Co correlates to Mn (r = 0.79)3. Hydrogenetic nodules and crusts show generally higher Co contents than diagenetically formed nodules. This ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/304716a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    10 Be-dating of a manganese crust from Central North Pacific and implications for ocean palaeocirculation (1984)
    [s.l.] : Nature Publishing Group
    Nature 309 (1984), S. 540-543 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During RV Valdivia cruise VA 13-2, 1976, a very thick ferromanganese crust (20-40 cm) was dredged near the summit of a submarine peak at a depth of 4,830m in the Central Pacific7'8. In this crust, which directly overlies altered basaltic rock, three macroscopically distinguishable main zones (top ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/309540a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence for a higher natural uranium content in world rivers (reply) (1979)
    [s.l.] : Nature Publishing Group
    Nature 282 (1979), S. 112-112 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MANGINI REPLIES-Our conclusion that in the Handschusheimer Feld area the influence of uranium from phosphate fertilisers is small was derived both from the low uranium contents of groundwater and river water, more importantly, from their high AU (-1.6). We appreciate the opportunity to clarify a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/282112b0
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence for a higher natural uranium content in world rivers (1979)
    [s.l.] : Nature Publishing Group
    Nature 278 (1979), S. 337-339 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The uranium content of river waters varies by about two orders of magnitude, from 0.04 jxg G ? for the Amazonas, to a few lAgl"1 (refs 1-5). This higher uranium content is, however, suspected to be partly of anthropogenic origin due to uranium derived from phosphate fertilisers5. In fact, compared ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/278337a0
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  • 6
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    Beryllium, thorium and protactinium isotope ratios in sediments from the Galapagos microplate
    PANGAEA
    In:  Supplement to: Frank, Martin; Eckhardt, Joerg-Detlef; Eisenhauer, Anton; Kubik, Peter W; Dittrich-Hannen, Beate; Segl, Monika; Mangini, Augusto (1994): Beryllium 10, thorium 230, and protactinium 231 in Galapagos microplate sediments: Implications of hydrothermal activity and paleoproductivity changes during the last 100,000 years. Paleoceanography, 9(4), 559-578, https://doi.org/10.1029/94PA01132
    Details
    Publication Date: 2023-05-12
    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.
    Keywords: Equatorial East Pacific; HYMAS II; KAL; Kasten corer; KLH068; KLH093; SO60; SO60_68; SO60_93; Sonne
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 7
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    (Table 2) Geochemistry and radionuclides of sediment core SO60-93
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: AGE; Alpha spectrometry; Aluminium oxide; Beryllium-10; Beryllium-10, standard deviation; Calcium carbonate; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Equatorial East Pacific; HYMAS II; Iron oxide, Fe2O3; Isotope ratio mass spectrometry; KAL; Kasten corer; KLH093; Manganese oxide; Neogloboquadrina dutertrei, δ18O; Protactinium-231; Protactinium-231, standard deviation; SO60; SO60_93; Sonne; Thorium-230, supported, uncorrected; Thorium-230, supported, uncorrected standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 1426 data points
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    DATA PANGAEA
  • 8
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    Geochemistry of sediments from the continental slope of the Ross Sea, Antarctica
    PANGAEA
    In:  Supplement to: Ceccaroni, L; Frank, Martin; Frignani, M; Langone, Leonardo; Ravaioli, Mariangela; Mangini, Augusto (1998): Late Quaternary fluctuations of biogenic component fluxes on the continental slope of the Ross Sea, Antarctica. Journal of Marine Systems, 17(1-4), 515-525, https://doi.org/10.1016/S0924-7963(98)00061-X
    Details
    Publication Date: 2023-05-12
    Description: A sediment core, collected from the western part of the continental slope of the Ross Sea at 2380 m water depth, records events of the last two climatic cycles (250 kyr). A 230Thex-based chronology was obtained and boundaries of the isotope stages were set assuming that biological productivity was enhanced during periods of less ice cover. Then, 230Thex0, organic carbon, biogenic silica and biogenic Ba distributions were compared to the glacial-interglacial stage boundaries and corresponding ages of the delta18O record of Martinson et al. [Martinson et al., 1987, doi:10.1016/0033-5894(87)90046-9]. Sediment accumulation rates ranged between 1.2 cm kyr**-1 in the isotope stage 6 and 3.8 cm kyr**-1 during the Holocene. Variations in the concentrations and fluxes of organic carbon, biogenic Ba, biogenic silica and Mn gave information on palaeoclimate changes. Processes of sediment redistribution in the Ross Sea margin were enlightened from a comparison of the measured and expected fluxes of 230Thex. Calculation of the focusing-corrected accumulation rates of biogenic Ba enabled us to evaluate the export palaeoproductivity. Corrected accumulation rates of biogenic components and calculated palaeoproductivities were low, compared to the Antarctic Polar Front in the Atlantic sector, throughout the last two climatic cycles. Glacial-interglacial changes of sea ice cover and ventilation of the Ross Sea were probably major causes of variations in biogenic particle flux and distribution of redox-sensitive elements within the sediment column.
    Keywords: ANTA91-8; GC; Gravity corer; Silicon Cycling in the World Ocean; SINOPS
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 9
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    (Table 2) Glacial-interglacial setting of sediment core ANTA91-8
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age, maximum/old; Age, minimum/young; Age model, Martinson et al (1987); ANTA91-8; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; GC; Gravity corer; Isotopic event; Sedimentation rate; Silicon Cycling in the World Ocean; SINOPS
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 10
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    Uranium, Thorium and ionium content of the bulk samples and amount of EDTA extracted Th-isotopes in sediment core M17_17, Ionian Sea (Table2)
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 17M17; BC; Box corer; Calcium carbonate; CIM (Cooperative Investigations of the Mediterranean); Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Description; Ionian Sea; M17; M17_17; Meteor (1964); Thorium-230; Thorium-230, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 106 data points
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    DATA PANGAEA
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