Geometry, Sequence and Amount of Thrusting in the Subalpine Molasse of Austria and Bavaria (original) (raw)

Abstract

The Subalpine Molasse (SM) is the most external tectonic unit of the Alps extending from Geneva (Switzerland) to west of Salzburg (Austria), where it disappears into the subsurface. From western Austria eastward, continental, coarse-grained conglomerates grade into deep marine marls. We investigate the influence of this facies transition on tectonic style and observed amount of shortening in four cross sections. 1 In western Austria thick coarse-grained continental conglomerates (>3km) overlie marine marls, which form the regional detachment. Ramp-flat geometries formed in the SM. The frontal structure is a triangle zone at depth with a hinterland-facing fold compensating movement on the passive roof thrust of the triangle. All structures were steepened during late contraction. 2 In western Bavaria the continental unit is sandstone-dominated, and overlies thick marine marls. An upright detachment fold takes up the movement of the passive backthrust of the frontal triangle zone. T...

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