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Showing 1 to 8 of 8 for “"Sapropel"”.
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High-resolution geochemical studies on the most recently-accumulated sapropel S1 in the eastern Mediterranean
… Sea contain Corg-rich layers, termed sapropels, interbedded with Corg-poor sediments which form by far the greater part of the sedimentary record. This research presents a high-resolution geochemical investigation on slowly- and rapidly-accumulated SI units.Mn, Fe, I and Se profiles in …
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Macroscopic Benthos Populations and Taxonomy of the Family Chironomidae in Lake Poinsett, South Dakota
… divided into three substrate types (sand, sand-sapropel mixture and sapropel) and the percent of each substrate type was calculated. Nineteen macroscopic genera were taken from ten sampling stations located throughout the lake. Descriptions are presented for organisms in this group. Diversity of …
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Nitrogen isotopes in chlorophyll and the origin of Eastern Mediterranean sapropels
… origin of Late Quaternary Eastern Mediterranean sapropels. Techniques are presented for the determination of chlorin nitrogen and carbon isotopic ratios in marine particles and sediments with a precision greater than 0.15 per mil for both isotopes. The procedure can be performed in about 4 hours …
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High-resolution stratigraphy of Central and Southern Adriatic Quaternary deposits of sub-Milankovian climate change on Mediterranean circulation
… (14C AMS), teprhochronology, identification of sapropel-equivalent levels (Se). It’s worth to note the good consistency between the oxygen stable isotope curve obtained for borehole PRAD1-2 and other deeper Mediterranean records. The studied proxies allowed the recognition of all the isotopic …
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Characterizing ancient chemoclines through the use of pigment biomarkers and sedimentary stable isotope signatures
… negative excursions at the base of the high TOC sapropel layers that are associated with the mixing events. These negative excursions provide evidence for the greater influence of 13C-depleted dissolved inorganic carbon and 15N-depleted ammonium derived from below the chemocline. Additionally, …
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Palynofacies and sedimentology of some Late Jurassic sediments from the British Isles and northern North Sea
… resulting cyclicity is analagous to Quaternary sapropel sequences. Coccolith limestone intercalations are interpreted as indicative of partial mixing of a meromictic watermass. A formal subdivision of the Type Kimmeridge Clay Formation is proposed. Kimmeridgian sediments of the Brora-Helmsdale …
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GEOCHEMISTRY AND PETROGRAPHY OF SPELEOTHEMS FROM TURKEY AND IRAN: PALAEOCLIMATE AND DIAGENESIS
… Basin, coinciding with the deposition of Sapropel 1. *[N.B.: Additional data was attached to this thesis at the time of its submission. Please refer to the author for further details.]
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Megaturbidites and the late Quaternary regional sedimentology of the eastern and central Mediterranean Sea
… hemipelagic sediment accumulation and sapropel formation provide dateable horizons, allowing calculation of sedimentary budgets and insights into controls and influences on the many sedimentary processes noted in this region. Across the Mediterranean, distinctive, thick turbidites with …