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  • 1
    Electronic Resource
    Electronic Resource
    Mid-Holocene stable isotope record of corals from the northern Red Sea (2000)
    Springer
    International journal of earth sciences 88 (2000), S. 742-751 
    Details
    ISSN: 1437-3262
    Keywords: Key words African monsoon ; Corals ; Holocene ; Northern Red Sea ; Stable isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract We present a study based on X-ray chronologies and the stable isotopic composition of fossil Porites spp. corals from the northern Gulf of Aqaba (Red Sea) covering the mid-Holocene period from 5750 to 4450 14C years BP (before present). The stable oxygen and carbon isotopic compositions of five specimens reveal regular annual periodicities. Compared with modern Porites spp. from the same environment, the average seasonal δ 18O amplitude of the fossil corals is higher (by ca. 0.35–0.60‰), whereas annual growth rates are lower (by ca. 3.5 to 2 mm/year). This suggests stronger seasonality of sea surface temperatures and increased variability of the oxygen isotopic composition of the sea water due to changes in the precipitation and evaporation regime during the mid-Holocene. Most likely, summer monsoon rains reached the northern end of the Red Sea at that time. Average annual coral growth rates are diminished probably due to an increased input and resuspension of terrestrial debris to the shallow marine environment during more humid conditions. Our results corroborate published reports of paleodata and model simulations suggesting a northward migration of the African monsoon giving rise to increased seasonalities during the mid-Holocene over northeastern Africa and Arabia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050302
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  • 2
    Electronic Resource
    Electronic Resource
    Terrigenous sediment supply along the Chilean continental margin: modern regional patterns of texture and composition (1998)
    Springer
    Geologische Rundschau 87 (1998), S. 477-494 
    Details
    ISSN: 0016-7835
    Keywords: Key words Chile ; Modern continental margin sedimentation ; Marine sediments ; Clastic sediments ; Granulometry ; Mineralogy ; Clay mineralogy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The regional patterns of texture and composition of modern continental slope and pelagic sediments off Chile between 25°S and 43°S reflect the latitudinal segmentation of geological, morphological, and climatic features of the continental hinterland. Grain-size characteristics are controlled by the grain-size of source rocks, the weathering regime, and mode of sediment input (eolian off northern Chile vs fluvial further south). Bulk-mineral assemblages reveal a low grade of maturity. Regional variations are governed by the source-rock composition of the different geological terranes and the relative source-rock contribution of the Coastal Range and Andes, as controlled by the continental hydrology. The relative abundance of clay minerals is also predominantly influenced by the source-rock composition and partly by continental smectite neoformation. Latitudinal variations of illite crystallinities along the Chilean continental slope (and west of the Peru–Chile trench) clearly reflect modifications of the weathering regime which correspond to the strong climatic zonation of Chile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050223
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    Paper (German National Licenses)
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