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- W2188976388 abstract "Mineralogical and geochemical studies were carried out on red and green shales from the «Flysch Rosso» sediments (southern A pennines, Italy) in order to investigate on the cause(s) of the colour variation. The two chromatic types show compositional analogies and few differences are relevant, the main consisting in Fe content. Although the statistical analyses evidenced a slightly significant difference in some chemical parameters indicative of the redox conditions at the water-sediment interface (U, Corg, FeO, V /Cr, U/Th), they, nevertheless, still indicate oxic environments both in red and in green shales. The difference in the organic carbon content is small and cannot be seen as the cause of the chromatic variation. The origin of the red colour is ascribed mainly to the presence of hematite, which is ubiquitous in the red shales but in a very little amount in a few of the green ones. D ifferent hematite, feldspars, and kaolinite contents of red and green shales as well as geochemical considerations suggest a detrital hypothesis for Fe-hydroxides and a diagenetic one for the hematite. * Corresponding author, E-mail: fiore@ira.pz.cnr.it RIASSUNTO. Studi a carattere mineralogico e geochimico sono stati svolti sulle argilliti rosse e verdi dei sedimenti appartenenti alla formazione del «Flysch Rosso» (Appennino meridionale, ltalia) al fine di comprendere le cause della loro variazione cromatica. Le due varieta cromatiche delle argilliti esaminate mostrano una analoga composizione tranne alcune differenze, soprattutto per il contenuto del ferro. Le analisi statistiche evidenziano una differenza, non molto significativa, dei valori di alcuni parametri chimici caratteristici delle condizioni redox all' interfaccia acqua-sedimento (U, Corg, FeO, V /Cr, U/Th); 1' ambiente risulta essere ossidante sia per le argill iti rosse e verdi. La differenza del contenuto del carbonio organico e piccola e non puo essere considerata la causa della variazione cromatica. L' origine del colore rosso e principalmente ascrivibile all'ematite, che e sempre presente nelle argilliti rosse mentre e in modeste quantita solo in alcuni campioni delle argilliti verdi. D ifferenti contenuti di ematite, feldspati e caolinite delle argilliti rosse e verdi cosl come le considerazioni geochimiche suggeriscono un' origine detritica per gli idrossidi di ferro ed una diagenetica per l'ematite." @default.
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- W2188976388 date "2000-01-01" @default.
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- W2188976388 title "The «Flysch Rosso» shales from the southern Apennines, Italy. 2. The origin of the colour" @default.
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