Advances in field work approach on volcanic debris avalanche deposits: understanding their context and explaining processes using facies analysis

Abstract:

Volcanic debris avalanche deposits (VDADs) have the particularity to present a greater diversity of facies than any other volcanic deposit. Their description is fundamental to decipher the complexity of rockslide-debris avalanches. The variety of rock types, structures and textures is responsible for the multiplication of facies terms in literature. Despite several attempts to build coherent terminologies we must face the fact that it is almost impossible to compare the facies observations made on different VDADs. The terms" block facies" and" mixed facies" are widely used but they provide little information on the phenomenon. Facies must be defined in order to get meaningful information on the sector collapse origin and the flow mechanisms. We propose a descriptive strategy and its associated terminology based on literature and personal experience to improve facies analysis. We illustrate this approach with observations …

Año de publicación:

2010

Keywords:

Fuente:

google