Geology of Mélanges

Dear Colleagues,

In the shallow parts of accretionary complexes, mélanges may directly originate from sedimentary mass-transport processes (sedimentary mélanges), and/or mud-diapiric processes (diapiric mélanges), being subsequently tectonically deformed at progressively deeper crustal levels (tectonic mélanges). This continuous interplay of overlapping processes leads to the development of polygenetic mélanges, widely represented in exhumed orogenic belts. Nonetheless their widespread occurrence, poor communication still lingers among specialists dealing with mass transport deposit, subsurface remobilization and studies on mélange-forming processes in the shallow subsurface. In this framework, multidisciplinary and comparative studies of “fossil” and “modern” mass transport deposits and mud diapirs identified in mountain chains and contemporary sedimentary basins, respectively, provide hard facts on long debated arguments, like what influences preservation of primary (e.g. sedimentary) features in mélanges during the subsequent tectonic/mud-diapiric deformations, and, at larger scales, what control the distribution and types of “fossil” mass transport deposits in light of the increasing recognition and (re)interpretation of sedimentary mélanges in subduction and collisional settings.

The aim of this Special Issue is to outline the current and further ways of research on polyphased “chaotic” units, focusing on the earlier and shallower phases of deformation, at the various scales.

Dr. Kei Ogata
Guest Editor

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