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• W2000138105 abstract "Foraminiferal assemblages in laminites cropping out at the Bric (i.e. Hill) della Muda (Nizza Monferrato, Piedmont, Northwestern Italy) document deep marine conditions during the early Messinian, spanning a time-interval approximating, or slightly wider than the stratigraphic range of Globorotalia nicolae (6.82–6.72 Ma). Fluctuations in abundance of planktonic warm-water oligotrophic taxa and cold-water eutrophic species show a cyclical pattern, very comparable to variations measured in cyclically-bedded formations of the pre-evaporitic Messinian in the Mediterranean area. A subtropical climate with cyclic warmer and cooler episodes, characterized by surface water stratification and vertical mixing in the water column, respectively, is also documented. A depositional depth close to or larger than 1000 m is inferred on the basis of planktonic assemblages yielding also the deep planktonic Hastigerinella digitata and of very high P/(P + B) ratios. Anoxic or strongly dysoxic bottom conditions are indicated by the absence or rareness of benthic foraminifers, which are represented by taxa tolerant of low-oxygen or high organic content (Bolivina pseudoplicata, Chilostomella oolina, Globobulimina affinis). A slight decrease in P/(P + B) ratios, and the presence of rare shallow-water forms in the uppermost layers suggest a mild dysoxia and a probable shallowing, when compared with coeval events in Northern Apennines and Southern Greece sections. Les associations à foraminifères des marnes argileuses laminées affleurant le long du Bric della Muda (Nizza Monferrato, Piémont, Italie nord-occidentale) représentent un environnement pélagique et un climat subtropical au Messinien inférieur (biozone Globorotalia miotumida), pendant un intervalle de temps correspondant approximativement à la distribution stratigraphique de Globorotalia nicolae (6,82–6,72 sMa). L’étude quantitative réalisée sur les foraminifères planctoniques a documenté des variations cycliques d’abondance des taxons thermophiles, oligotrophiques (Orbulina, Globigerinoides) et des taxons d’eaux froides, eutrophiques (Neogloboquadrina acostaensis, Globigerina bulloides), en accord avec les données disponibles dans les successions rythmiques du Messinien inférieur de Méditerranée. Les associations indiquent une paléobathymétrie proche de –1000 m, sur la base des valeurs élevées de P/(P + B) et de la présence du taxon planctonique d’eaux profondes Hastigerinella digitata. Les conditions anoxiques ou dysoxiques du fond sont avérées par l’absence ou la rareté des espèces benthiques réputées tolérantes à de faibles taux d’oxygène dissous ou à une abondante matière organique (Bolivina pseudoplicata, Chilostomella oolina, Globobulimina affinis). Des corrélations ont été proposées avec des coupes des Apennins septentrionaux et de la Grèce méridionale." @default.
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• W2000138105 date "2007-05-01" @default.
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• W2000138105 title "Foraminiferal assemblages of the Bric della Muda laminites (Nizza Monferrato, Piedmont): Proxies of cyclic palaeoenvironmental changes in the early Messinian of Northwestern Italy" @default.
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• W2000138105 doi "https://doi.org/10.1016/j.geobios.2006.11.003" @default.
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