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- W3005651551 abstract "The thrust sheets of the Northern Calcareous Alps were emplaced during Late Cretaceous thrustdominatedtranspression expressed by thrust sheets segmented by closely spaced tear faults. Thrustsheet-top sediments were deposited during thrusting and associated fold growth and were controlledby active folding and tearing. We observe two types of angular unconformities: (1) Angular unconformitiesabove folds between tear faults conform with the model of progressive unconformities.Across these unconformities dip decreases upsection. (2) Here, we define progressive unconformitiesthat are related to tear faults and are controlled by both folding and tearing. Across these unconformitiesboth strike and dip change. In growth strata overlying folds dissected by high-angle faults,such unconformities are expected to be common. We used analogue modelling to define the geometryof the tear faults and related unconformities. Within the syn-tectonic sediments, a steep, upwardflattening thrust within a broader, roughly tulip-shaped drag zone develops. The thrust roots in thetear fault in pre-tectonic deposits and is curved upward toward the downthrown block. Vertical offseton the thrust is related to differential vertical uplift caused by, for example, growth of folds withdifferent wavelength and amplitude on either side of the tear fault. Formation of progressive unconformitiesis governed by the relationship between the rates of deposition and vertical growth of astructure. Fault-related progressive unconformities are additionally controlled by the growth of thevertical step across the tear fault. When the rates of vertical growth of two neighbouring folds separatedby a tear fault are similar, the rate of growth across the tear fault is small; if the first differ, thelatter is high. Episodic tear fault activity may create several angular unconformities attached to a tearfault or allow the generation of angular unconformities near tear faults in sedimentary systems thathave a rate of deposition too high to generate classical progressive unconformities between the tearfaults." @default.
- W3005651551 created "2020-02-24" @default.
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- W3005651551 date "2010-05-01" @default.
- W3005651551 modified "2023-09-27" @default.
- W3005651551 title "Geometry of growth strata in a transpressive fold belt in field and analogue model: Gosau Group at Muttekopf, Northern Calcareous Alps, Austria" @default.
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