Fault slip analysis and late exhumation of the Tauern Window, Eastern Alps

Bertrand, Audrey; Rosenberg, Claudio; García, Sebastián Gimeno

doi:10.1016/j.tecto.2015.01.002

Cited by 29 publications

(28 citation statements)

References 66 publications

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“…The large majority of the fissures present in all the investigated localities are oriented subvertically (C1 and C2 type on figure 3c), roughly striking NE-SW. This would indicate a similar stress orientation for the development of this fissure type, which is in line with paleostress orientations provided by Bertrand et al (2015). However, even if all sub-vertical fissures are subparallel, at least two generations exist.…”

Section: Field Observationssupporting

confidence: 79%

Cenozoic deformation in the Tauern Window (Eastern Alps, Austria) constrained by in-situ Th-Pb dating of fissure monazite

Ricchi¹,

Bergemann²,

Gnos³

et al. 2019

Preprint

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Abstract. Thorium-Pb crystallization ages of hydrothermal monazites from the western, central and eastern Tauern Window provide new insights into Cenozoic tectonic evolution of the Tauern metamorphic dome. Growth domain crystallization ages range from 22.3 ± 0.6 Ma to 7.7 ± 0.9 Ma. Three major periods of monazite growth are recorded between ~ 22–19 (peak at 21 Ma), 19–15 (major peak at 17 Ma) and 13–8 Ma (major peaks at 12, 10 and 8 Ma), respectively interpreted to be related to prevailing N-S shortening, in association with E-W extension, beginning strike-slip movements, and reactivation of strike-slip faulting. Fissure monazite ages largely overlap with zircon and apatite fission tracks data. Besides tracking the thermal evolution of the Tauern dome, monazite dates reflect episodic tectonic movement along major shear zones that took place during the formation of the dome. Geochronological and structural data from the Pfitschtal area in the western Tauern Window show the existence of two cleft generations separated in time by 4 Ma and related to strike-slip to oblique-slip faulting. Moreover, these two phases overprint earlier phases of fissure formation.

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Section: Field Observationssupporting

confidence: 79%

Cenozoic deformation in the Tauern Window (Eastern Alps, Austria) constrained by in-situ Th-Pb dating of fissure monazite

Ricchi¹,

Bergemann²,

Gnos³

et al. 2019

Preprint

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“…Normal faulting along the Brenner and Katschberg Faults decoupled the folding footwalls from their largely unfolded hanging walls. The young ages in the vicinity of the Brenner Fault (Figures , , and a), the late, modest increase of exhumation rates in the footwalls of the Katschberg and Brenner Faults (Figure ), and the absence of brittle structures pointing to N‐S shortening [ Bertrand et al ., ] suggest the existence of a second, minor stage of exhumation of Pliocene age that was mainly driven by extensional unroofing along the Brenner and Katschberg Faults.…”

Section: Discussionmentioning

confidence: 99%

Exhumation mechanisms of the Tauern Window (Eastern Alps) inferred from apatite and zircon fission track thermochronology

et al. 2017

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Orogen‐parallel extension and orogen‐perpendicular shortening accommodated by folding acted at the same time to exhume the Tauern Window. In order to investigate the relative contribution of upright folding and erosion and of extensional denudation for exhumation, we provide compilations in map view of previous and new zircon and apatite fission track ages. These age maps show that isoage contour lines are subparallel to the axial planes of large‐scale, upright folds. On age versus distance diagrams, along a profile perpendicular to the dome axis, all thermochronometers show bell‐shaped curves with younger ages in the hinge area of the dome and age differences between different chronometers decreasing from the limbs to the hinge area. All these observations suggest that folding synchronous with erosion was largely responsible for exhumation of the Tauern Window. The younger ages and the higher fold amplitudes of the western subdome compared to the eastern one are corroborated by the results of inversion of cooling ages that show higher exhumation rates in the west. These reflect one and the same shortening and folding event that affected the entire Tauern Dome synchronously, but at higher rates than that in the western subdome. Only during Pliocene time were exhumation rates slightly higher along the normal faults bordering the window; hence, extensional unroofing may have dominated exhumation in the Pliocene. The northward displacement of the Dolomites Indenter was associated to a clockwise rotation, which caused increased amounts of shortening westward, hence higher uplift and exhumation rates in the western subdome.

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“…The opposite shear sense of cataclasites along the indenter front (Mölltal Fault, dextral type 1 surfaces) and of adjacent mylonite along the southwestern margin of the Eastern Tauern Dome (sinistral ductile southern branch of the Katschberg Normal Fault) reflects the contrast in rheologies of the cold indenting block and hot, laterally extending and exhuming orogenic crust. By 17 Ma, the entire orogenic crust had cooled to below 300°C [ Dunkl et al , ; Bertrand et al , ], resulting in brittle top‐SE extension as recorded by fault surfaces in both the Austroalpine and Penninic units (cataclasite of the KNF and type 2 surfaces of the Mölltal Fault).…”

Section: Discussionmentioning

confidence: 99%

Changing patterns of exhumation and denudation in front of an advancing crustal indenter, Tauern Window (Eastern Alps)

et al. 2017

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The changing shape of indenting crustal blocks during northward motion of the Adriatic microplate induced migration of Miocene doming and orogen‐parallel extension of orogenic crust in the Tauern Window. New structural and kinematic data indicate that initial shortening of the Penninic nappe pile in the Tauern Window by upright folding and strike‐slip faulting was transitional to coeval north‐south shortening and east‐west extension; the latter was accommodated by normal faulting at the eastern and western margins of the window. Retrodeforming these post‐nappe structures in map view yields a map‐view reconstruction of the orogenic crust back to 30 Ma, including the onset of pronounced indentation at ~21 Ma. This model supports the notion that indentation involved approximately equal amounts of north‐south shortening and orogen‐parallel stretching and extrusion toward the Pannonian Basin, as measured from the indenter tip to the European foreland in the north and Austroalpine units in the east. Comparison of areal denudation of the orogenic crust before and after indentation indicates that erosion associated with upright folding was the primary agent of denudation, whereas extensional unroofing and limited erosion along normal faults at the eastern and western ends of the Tauern Window accounted for only about a third of the total denudation.

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Fault slip analysis and late exhumation of the Tauern Window, Eastern Alps

Cited by 29 publications

References 66 publications

Cenozoic deformation in the Tauern Window (Eastern Alps, Austria) constrained by in-situ Th-Pb dating of fissure monazite

Cenozoic deformation in the Tauern Window (Eastern Alps, Austria) constrained by in-situ Th-Pb dating of fissure monazite

Exhumation mechanisms of the Tauern Window (Eastern Alps) inferred from apatite and zircon fission track thermochronology

Changing patterns of exhumation and denudation in front of an advancing crustal indenter, Tauern Window (Eastern Alps)

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