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  • 1
    Electronic Resource
    Electronic Resource
    Composition and origin of clay minerals in Holocene sediments from the south-eastern North Sea (2000)
    Oxford UK : Blackwell Publishing Ltd
    Sedimentology 47 (2000), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The distribution of clay minerals varies systematically in sediments from Holocene core material taken along a profile from the East Frisian coast to the Doggerbank. The proportion of illite increases with distance from the coast at the expense of kaolinite, whereas slight variations are seen in smectite and chlorite abundances. The chemical composition changes, and the K/Rb ratio and K-Ar isotopic age of illite increase seawards. This trend results from progressive mixing processes of riverine detritus with Pleistocene fluvioglacial material reworked during the Holocene transgression. However, the clay fluvial flux only became dominant during the decreasing rate of sea-level rise in the Late Holocene, especially near the shore. For example, modern sediments in tidal flats contain 75% of river-borne Holocene-supplied clay detritus, whereas this amount is only 10% in modern marine sediments at the Doggerbank.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3091.2000.00282.x
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  • 2
    Electronic Resource
    Electronic Resource
    Rare earth elements and strontium isotopes of polymetallic nodules from southeastern Pacific Ocean (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 27 (1980), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Rare earth element (REE) distributions and 87Sr/86Sr ratios were determined for nodule crusts and associated surface sediments collected in the southeastern Pacific Ocean between South America and the Tuamotu archipelago. The shale-normalized patterns of the REE from the surface sediments show pronounced negative anomalies in Ce which indicate a marine origin. One 87Sr/86Sr ratio also has a value characteristic for seawater strontium. REE patterns from the nodule crusts, when normalized to shales, seawater or associated surface sediment, show that a marine origin can also be proposed for the oxy-hydroxides. Only the Ce shows a systematic scatter, which could be the result of fluctuations in the oxidation-reduction conditions during nodule growth. The marine origin for REE is corroborated by the 87Sr/86Sr ratios which average 0 · 70905 ± 0 · 00019 (2σ), a value close to the seawater 87Sr/86Sr ratio of 0·70910 ± 0 · 00035. If the major metals of the polymetallic nodules have the same origin as these trace elements, then a direct precipitation from seawater can be postulated for the crusts studied here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1980.tb01655.x
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  • 3
    Electronic Resource
    Electronic Resource
    87Sr/86Sr composition of evaporitic carbonates and sulphates from Miocene sediment cores in the Mediterranean Sea (D.S.D.P., Leg 13) (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 23 (1976), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The 87Sr/86Sr ratios of evaporitic carbonates and sulphates from Miocene sediment cored in the Mediterranean Sea show a depletion of 87Sr when compared to the isotopic composition of the Miocene contemporaneous marine strontium: 0.70803 versus 0.70936. The arrival into the evaporitic environment of strontium brought by continental waters can explain this difference.The variation of the 87Sr/86Sr ratios is, nevertheless, noticeable only when the influence of the continental waters is already well marked. This is proved when one compares the results obtained with strontium, to the results of isotopic analysis made on oxygen, carbon, sulphur and hydrogen taken from the same samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1976.tb00043.x
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  • 4
    Electronic Resource
    Electronic Resource
    Radiation-related retrograde hydrogen isotope and K—Ar exchange in clay minerals (1987)
    [s.l.] : Nature Publishing Group
    Nature 330 (1987), S. 638-641 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Athabasca basin (Saskatchewan, Canada) contains ten major high-grade uranium deposits (-300,000 tons U, mean grade -2% U). These deposits are spatially related to the major middle Proterozoic unconformity between the Aphebian-Archaean basement and the Helikian cover9'11. The newly formed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/330638a0
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