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- W138024917 abstract "In the Lombardy basin (northern Italy), the main part of the organic-rich Rhaetic depositional sequence consists of metric-scale asymmetric cycles, each divided into three parts: lower clay portion, a central rhythmic portion consisting of repeated marl-limestone couplets, the limestone part of which gradually thickens upward, and a wholly carbonate upper unit. The organic content is often high in the lower part of each cycle but decreases upward. The analysis of the diagenetic history demonstrates that these lithological alterations are fundamentally sedimentary. This cyclicity is derived from the interference of a lower-frequency (magnitude of 100,000 yr) asymmetric carbonate mud signal with a high-frequency argillaceous mud signal, as indicated by spectral power analysis. The calcareous basinal mud was predominantly allochthonous in origin, coming from the adjacent platforms. The associated asymmetric carbonate signal was a response to eustatic fluctuations; the exportation of platformal calcareous muds, which was negligible in the deepening phase, greatly increased during the shallowing evolution, and was eventually stopped by widespread subaerial exposition. In contrast, the argillaceous signal is likely to be climatically modulated. The study of these cycles improves their basin analysis, giving us a suitable method to correlate difference sections both at outcrops and in the subsurface." @default.
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- W138024917 date "1988-08-01" @default.
- W138024917 modified "2023-09-27" @default.
- W138024917 title "Asymmetric sedimentary cycles in the organic-rich in Italian rhaetic" @default.
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