Abstract
AbstractThe tectonized and metamorphosed mudrocks within the Variscan accretionary prism of the Kaczawa Mountains in SW Poland comprise sedimentary mélanges together with more coherent stratigraphic units; some represent large olistoliths deposited in a submarine trench. We infer a trend of progressive near-surface stratal disruption in mud-dominated deposits due to dewatering that forms a continuum with subduction-related tectonic structures imposed on unconsolidated sediment during deeper burial. The assemblage of characters suggests that an accretionary prism environment can influence, and leave characteristic traces of, the total burial history of a trench succession.
Highlights
The processes taking place in active submarine trenches are difficult to study because such regions are poorly accessible
But the unconsolidated sediment is difficult to sample for detailed study of sedimentary fabrics
Remarkable, communist-era deep borehole core material from Poland (Figs. 1, 2, 3) has yielded fine detail of tectonic fabrics imposed upon poorly consolidated deposits (Baranowski et al 1998; Collins et al 2000)
Summary
The processes taking place in active submarine trenches are difficult to study because such regions are poorly accessible. The study of deep sea cores allied with geophysical analysis has provided an overall picture of this environment (e.g. von Huene & Suess, 1988; von Huene & Scholl, 1991, 1993; Clift & Vannucchi, 2004; Stern, 2002; Scudder et al 2009). We here suggest that characteristic fabrics associated with the deeper environment extend up into shallow burial conditions and, together, these form a spectrum of micro- to meso-scale textures that may be used to help identify an accretionary prism setting
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