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• W2007646906 abstract "Abstract The well-known Semaforo and Vrica sections in Calabria (Italy) represent a sequence of homogeneous marls with intercalations of laminated marls. These marine sediments are of Pliocene to Pleistocene age and were originally deposited at a water depth of about 500 m. The homogeneous marls have been deposited under oxic conditions, the laminated marls under oxygen-poor or anoxic conditions. Samples collected from present-day outcrops of the homogeneous and laminated marls were analyzed for major, minor and trace elements. The laminated marls have a lower CaCO3 content, as compared to the homogeneous marls, which is primarily caused by dilution through increased input from land. In the case of one Semaforo and all but one Vrica laminates the CaCO3 contents could have been diminished further by conversion into gypsum, which was formed after oxidation of pyrite. Variations in the organic carbon (Corg) content of the marls are probably caused by changes in sedimentation rates. The small average Corg enrichment in the laminates may be attributed to better preservation under euxinic conditions. The high Cl content of some samples is probably caused by evaporation of porewater from the sampled outcrops. The profiles of the Al, Ti, Fe, K, Mg and P contents of the terrigenous components are practically equal throughout the sections. The laminateshave systematically lower Na, Zr and Mn contents. The lower Na and Zr contents indicate changes in the sedimentation regime, whereas the lower Mn content can be attributed to reductive dissolution under suboxic to anoxic conditions. In comparison with the homogeneous marls, the laminates are relatively enriched in redox-sensitive and/or chalcophile trace elements in the decreasing order Mo > > Cd ≈ Sb > Se ≈ U > Cu > V > Ni ≈ Cr. Syn-sedimentary or early-diagenetic hydrogenous enrichment from overlying seawater is the only plausible explanation for their enrichment. For most of these trace elements the enrichment is more pronounced when the laminates were deposited during bottom-water anoxia, a condition inferred from the presence of pyrite-derived gypsum. For reasons not understood, two trace elements behave in opposite fashion: laminated marls are depleted in As and Zn relative to the homogeneous marls." @default.
• W2007646906 created "2016-06-24" @default.
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• W2007646906 date "1993-08-01" @default.
• W2007646906 modified "2023-09-27" @default.
• W2007646906 title "Geochemical signatures preserved in sediments of the Semaforo and Vrica sections (Calabria, Italy) and their relations with variations of the sedimentary regime" @default.
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• W2007646906 doi "https://doi.org/10.1016/0031-0182(93)90143-7" @default.
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