Magnetic minerals as indicators of major environmental change in holocene black sea sediments: preliminary results

作者: C Strechie , F André , A Jelinowska , P Tucholka , F Guichard

DOI: 10.1016/S1474-7065(02)00119-5

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摘要: Four of the 38 sediment cores, collected from northwestern part Black Sea (French–Romanian BLASON Programme, 1998), were analysed in order to study major hydrological and environmental change sea during Holocene. This was caused by inflow marine Mediterranean waters into freshwater basin Sea. Two cores shelf two deep sea, representing distinct sedimentary environments along same profile, chosen. Lacustrine sediments deep-water uppermost all studied are characterised presence pyrite (FeS2), which indicates anoxic, sulphate reducing conditions water column (as it is observed nowin Sea). Pyrite formation this anoxic environment takes place belowthe oxic/anoxic limit, reduction sulphidation iron. The transition marked ferrimagnetic iron sulphide––greigite (Fe3S4). Greigite an intermediate mineral pyritisation reactions early diagenesis, can be preserved if cannot accomplished, due a high Fe/S ratio. In shallow shelf, where transgression discontinuity, greigite present below above it. suggests that conditions, allowing preservation greigite, started after transgression. represented level with organic matter content (sapropel). only lower its related arrival water. upper lacustrine probably prevailed here These results showthe sensitivity magnetic parameters Sea, allowa correlation between different depths, recognition marking � 2002 Elsevier Science Ltd. All rights reserved.

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