Die Deckenfalten der Hohenschwangauer Berge

Kockel, C. W.

doi:10.1007/bf01801862

Cited by 3 publications

(2 citation statements)

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“…13c). This inversion is supported by (i) observations by, e.g., Kockel and Richter (1924) and Tollmann (1969) of the Tannheim thrust sheet directly south of FSZ (within this study termed CRS marginal slice, see Fig. 2) dipping below the FSZ, (ii) observations within the Schäfflerseck slice, which got backthrusted onto sediments of the Tannheim-and Losenstein Fms.…”

Section: Transform Fault Zone Setting At the Northern Austroalpine Ma...supporting

confidence: 82%

A regional scale Cretaceous transform fault zone at the northern Austroalpine margin: Geology of the western Ammergau Alps, Bavaria

Sieberer

Ortner

2022

Austrian Journal of Earth Sciences

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We reinvestigated parts of the northern Austroalpine margin and provided structural and kinematic field data in order to interpret the kinematic relationship between the Cenoman-Randschuppe (CRS) marginal slice, Falkensteinzug (FSZ), Tannheim- and Karwendel thrust sheets occurring in a narrow strip at the northern front of the northwestern Northern Calcareous Alps (NCA). As a consequence, we propose a revised model for the tectonic evolution of the northern Austroalpine margin. As thrusting propagates from SSE to NNW (Cretaceous orogeny), the Karwendel thrust sheet (including its frontal part, the FSZ) was emplaced onto the Tannheim thrust sheet in the Albian, deduced from (i) upper-footwall deposits, the youngest sediments below the Karwendel thrust (Tannheim- and Losenstein Fms.), and (ii) thrust-sheet-top deposits unconformably overlying the deeply eroded northern Karwendel thrust sheet (Branderfleck Fm.). The future CRS marginal slice was, at that time, part of the foreland of this Early Cretaceous Alpine orogenic wedge. Pervasive overprint by sinistral shear within the CRS marginal slice and northern Tannheim thrust sheet suggests sinistral W-E striking transform faults cutting across this foreland, decoupling CRS marginal slice and FSZ from the main body of the NCA and enabling an independent evolution of the CRS marginal slice from the Early Cretaceous onwards. Subsequent Late Cretaceous and younger shortening leads to successive incorporation of Arosa zone, Rhenodanubian Flysch (RDF) and Helvetic units into the Alpine nappe stack; the Tannheim thrust representing the basal thrust of the NCA. Growth strata within thrust-sheet-top deposits (Branderfleck-Fm.) give evidence for refolding of thrust sheet boundaries. In a typical thin-skinned fold-and-thrust belt, deformation should cease towards the thrust front, whereas within the NCA it increases. An Austroalpine thrust front controlled by E-trending transform faults could cause an increase in deformation towards the most external NCA and explain the absence of the Arosa zone between Allgäu and Vienna. Such faults would most probably also cut out Lower Austroalpine units. Therefore, RDF and CRS marginal slice are juxtaposed; the latter found in the tectonic position of the Arosa zone. The presence of transform faults underlines the strong imprint of the opening of the North Atlantic Ocean on the depositional setting and tectonic evolution of the NCA.

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Section: Transform Fault Zone Setting At the Northern Austroalpine Ma...supporting

confidence: 82%

A regional scale Cretaceous transform fault zone at the northern Austroalpine margin: Geology of the western Ammergau Alps, Bavaria

Sieberer

Ortner

2022

Austrian Journal of Earth Sciences

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“…The Allgäu, Lechtal, and Inntal thrusts are the thrusts at the base of the respective thrust sheets basement (e.g., Oberhauser 1995;Faupl and Wagreich 2000;Handy et al 2010) and subduction of the Piemont-Liguria ocean had begun, the NCA travelled across the tectonically deeper Penninic units (Frisch 1979;Winkler 1988;von Eynatten and Gaupp 1999). The major thrusts were folded (the "Deckenfaltung" = refolding of nappes of Kockel 1926), which is recorded in the growth strata of the thrust-sheet-top deposits (Branderfleck Formation and Gosau Group;Ortner 2001Ortner , 2007Ortner and Gaupp 2007;Sommer et al 2010;Sieberer 2020;Fig. 4b).…”

Section: Structural Evolution Of the Ncamentioning

confidence: 99%

Thrust tectonics in the Wetterstein and Mieming mountains, and a new tectonic subdivision of the Northern Calcareous Alps of Western Austria and Southern Germany

Ortner

Kilian

2021

Int J Earth Sci (Geol Rundsch)

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We investigate the tectonic evolution of the Wetterstein and Mieming mountains in the western Northern Calcareous Alps (NCA) of the European Eastern Alps. In-sequence NW-directed stacking of thrust sheets in this thin-skinned foreland thrust belt lasted from the Hauterivian to the Cenomanian. In the more internal NCA major E-striking intracontinental transform faults dissected the thrust belt at the Albian–Cenomanian boundary that facilitated ascent of mantle melts feeding basanitic dykes and sills. Afterwards, the NCA basement was subducted, and the NCA were transported piggy-back across the tectonically deeper Penninic units. This process was accompanied by renewed Late Cretaceous NW-directed thrusting, and folding of thrusts. During Paleogene collision, N(NE)-directed out-of-sequence thrusts developed that offset the in-sequence thrust. We use this latter observation to revise the existing tectonic subdivision of the western NCA, in which these out-of-sequence thrusts had been used to delimit nappes, locally with young-on-old contacts at the base. We define new units that represent thrust sheets having exclusively old-on-young contacts at their base. Two large thrust sheets build the western NCA: (1) the tectonically deeper Tannheim thrust sheet and (2) the tectonically higher Karwendel thrust sheet. West of the Wetterstein and Mieming mountains, the Imst part of the Karwendel thrust sheet is stacked by an out-of-sequence thrust onto the main body of the Karwendel thrust sheet, which is, in its southeastern part, in lateral contact with the latter across a tear fault.

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Programm zur außerordentlichen Versammlung der Geologischen Vereinigung in Oberstdorf im Allgäu vom 26. August bis 4. September 1929

Richter¹,

Cornelius²,

Kockel³

1929

Geol Rundsch

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Die Deckenfalten der Hohenschwangauer Berge

Cited by 3 publications

References 0 publications

A regional scale Cretaceous transform fault zone at the northern Austroalpine margin: Geology of the western Ammergau Alps, Bavaria

A regional scale Cretaceous transform fault zone at the northern Austroalpine margin: Geology of the western Ammergau Alps, Bavaria

Thrust tectonics in the Wetterstein and Mieming mountains, and a new tectonic subdivision of the Northern Calcareous Alps of Western Austria and Southern Germany

Programm zur außerordentlichen Versammlung der Geologischen Vereinigung in Oberstdorf im Allgäu vom 26. August bis 4. September 1929

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