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- W1499003715 abstract "This work is an exploratory effort to address some key concepts about physical processes that influence the mobility, sedimentology and depositional mechanisms of pyroclastic density currents. The main mechanisms of particle support are critically reviewed and their influence on depositional mechanisms is discussed. The depositional behaviour of pyroclastic density currents is discussed in the light of new models that consider the different typologies within a continuum spectrum that spans from very dilute (fluid-dominated) to very concentrated (solid-dominated) flows. The combination of progressive aggradation and en masse freezing models is proposed on the basis of a model that takes into account the stepwise aggradation of discrete pulses that develop within a single current and that stop en masse when resisting bulk forces exceed driving ones. The influence of various types of morphological settings and obstacles on depositional mechanisms and mobility of pyroclastic density currents is examined and discussed in detail. Some examples of stepwise aggradation within pulsating PDCs are discussed using analyses of lithofacies and lithofacies associations of deposits emplaced under different flow-boundary conditions." @default.
- W1499003715 created "2016-06-24" @default.
- W1499003715 creator A5013368952 @default.
- W1499003715 creator A5078835678 @default.
- W1499003715 date "2008-01-01" @default.
- W1499003715 modified "2023-10-16" @default.
- W1499003715 title "Chapter 2 Sedimentology, Depositional Mechanisms and Pulsating Behaviour of Pyroclastic Density Currents" @default.
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