Sequence of Thrusting Within A Thick‐Skinned Tectonic Wedge: Evidence From<sup>40</sup>Ar/<sup>39</sup>Ar and Rb‐Sr Ages From the Austroalpine Nappe Complex of the Eastern Alps

Dallmeyer, R. D.; Handler, Robert; Neubauer, Franz; Fritz, Harald

doi:10.1086/516008

Cited by 37 publications

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“…This model links lead loss during metamorphism under greenschist metamorphic conditions to thermal stabilisation of metamict zircon. The lower intercept ages are close to 40 Ar/ 39 Ar whole rock and muscovite ages of the region (Dallmeyer et al 1998). …”

Section: Orthogneiss Boulders Of the Kalwang Conglomeratesupporting

confidence: 74%

“…The Noric nappe is unconformably covered by Late Carboniferous to Permian sediments forming the base of the Northern Calcareous Alps. All units suffered a Cretaceous metamorphism within the lower greenschist facies grade (Dallmeyer et al 1996(Dallmeyer et al , 1998Hoinkes et al 1999). The Cretaceous metamorphism was associated with ductile strain that resulted in shear zones in amphibolitegrade basement rocks of the Kaintaleck nappe (Neubauer et al 1987;Handler et al 1999).…”

Section: Geological Settingmentioning

confidence: 99%

“…380-360 Ma (Handler 1994;Handler et al 1999) and a Cretaceous age of ca. 100-90 Ma ( 40 Ar/ 39 Ar muscovite) indicates cooling after Alpine metamorphism (Dallmeyer et al 1998). …”

Section: Geological Settingmentioning

confidence: 99%

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Early Palaeozoic tectonothermal events in basement complexes of the eastern Greywacke Zone (Eastern Alps): evidence from U-Pb zircon data

Neubauer

Frisch

Hansen

2002

International Journal of Earth Sciences

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Field observations and U-Pb zircon data yield evidence that the Kaintaleck Complex represents a distinct crystalline basement unit of the eastern Greywacke Zone and contrasts partly with other pre-Alpine basement complexes of the Eastern Alps. The age data indicate possible Late Archean rock formation, several magmatic and metamorphic events in the Early Palaeozoic (ca. 520-490 and ca. 400-360 Ma), and low-grade metamorphic overprint in the Cretaceous. Zircons from a garnet gneiss layer in a plagioclase gneiss and amphibolite sequence yield an upper intercept age of ca. 2.55 Ga which is interpreted as a possible protolith age. The lower intercept age at 514 Ma represents either (1) a magmatic event or (2) a metamorphic overprint within amphibolite facies conditions. Magmatic zircons derived from granitic orthogneiss boulders of the Kalwang Conglomerate, which covers the crystalline basement, crystallised at ca. 500 Ma. The lower discordia intercepts of the orthogneiss boulders mark the Cretaceous low-grade metamorphic overprint. The lower intercept age of paragneiss zircons from another slice of the Kaintaleck Complex suggests a likely Devonian metamorphic event at ca. 390-400 Ma. The new data demonstrate that the Kaintaleck Complex experienced several stages of tectonothermal evolutions, which are in contrast to the evolution of the main mass of the Austroalpine basement. The data constrain linkages of this part of the Austroalpine basement to the Cordillere Ligérienne and Cadomian block within West-European Variscides.

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Section: Orthogneiss Boulders Of the Kalwang Conglomeratesupporting

confidence: 74%

Section: Geological Settingmentioning

confidence: 99%

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Early Palaeozoic tectonothermal events in basement complexes of the eastern Greywacke Zone (Eastern Alps): evidence from U-Pb zircon data

Neubauer

Frisch

Hansen

2002

International Journal of Earth Sciences

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“…The similarities include all four critical time levels shown in this study: the same age as the main-stage Variscan overprint of the Austroalpine Quartzphyllite units of the Eastern Alps and references therein), the age of Permian overprint (Schuster et al 2001), the Early Cretaceous age of a low-grade tectonothermal overprint in some Quartzphyllite units (Dallmeyer et al 1998;Wiesinger et al 2006), and the Late Cretaceous deformation contemporaneous with the subsidence of Gosautype basins (Neubauer et al 1995(Neubauer et al , 2000Dallmeyer et al 1996;Schuster & Frank 1999;Schuster et al 2001).…”

Section: Discussionmentioning

confidence: 59%

Tectonothermal history of the basement rocks within the NW Dinarides: new40 Ar/39 Ar ages and synthesis

Borojević¹,

Neubauer²,

Handler³

et al. 2012

Geologica Carpathica

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Very low-grade and low-grade metamorphosed basement rocks from distinct inliers of the Africa-derived northwestern Dinarides (Medvednica Mts and Paleozoic Sana-Una Unit, respectively) have been studied with the multigrain step-heating 40 Ar ages from the very low-grade basement exposed at Petrova and Trgovska Gora of the NW Dinarides. Within low-grade metamorphic basement rocks from the Medvednica Mts, we found no Variscan ages. White mica from phyllitic basement rocks of the Medvednica Mts gives predominantly early Alpine ages ranging between 135 and 122 Ma and younger Alpine ages of ~80 Ma. The early Alpine ages of 135 and 122 Ma are interpreted as the date to the onset of ductile nappe stacking predating the formation of Gosau-type collapse basins. The late early Alpine event of ~80 Ma can be traced in the entire Cretaceous-aged orogen of the CircumPannonian Region and is synchronous with subsidence of the Gosau-type basins and opening and closure of the neighbouring Sava-Vardar Zone.

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“…The AA complexes represent an orogenic wedge [7] of continental crust that formed during the Early Cretaceous collision [8,9] following the closure of the Meliata-Hallstatt ocean in the Late Jurassic. This event caused an extreme shortening of the AA unit with internal structural complexes metamorphosed to eclogite to greenschist facies cropping out in the Kreuzeck Mts.…”

Section: Introductionmentioning

confidence: 99%

P-T data of Ky-St-Grt gneisses hosting HP amphibolites and eclogites from the Austroalpine Polinik complex, Kreuzeck Mountains, Eastern Alps, Austria

2011

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This study focuses on metapelites of the Polinik complex in the Kreuzeck Mts. southeast of the Tauern Window, Eastern Alps, where kyanite -staurolite -garnet gneisses host eclogites and high pressure (HP) amphibolites of the Austroalpine basement. The stable mineral assemblage is garnet -staurolite -biotite -kyanite -quartz. Estimated metamorphic conditions from conventional geothermobarometry are 654±30 • C and 0.9±0.08 GPa, and Average P-T values calculated by THERMOCALC, are 665±15 • C at 0.77±0.09 GPa. Formation of the present mineral association in gneisses is related to the exhumation (D2) stage of hosted eclogites/HP amphibolites within a lateral strike-slip zone.

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Sequence of Thrusting Within A Thick‐Skinned Tectonic Wedge: Evidence From⁴⁰Ar/³⁹Ar and Rb‐Sr Ages From the Austroalpine Nappe Complex of the Eastern Alps

Cited by 37 publications

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Early Palaeozoic tectonothermal events in basement complexes of the eastern Greywacke Zone (Eastern Alps): evidence from U-Pb zircon data

Early Palaeozoic tectonothermal events in basement complexes of the eastern Greywacke Zone (Eastern Alps): evidence from U-Pb zircon data

Tectonothermal history of the basement rocks within the NW Dinarides: new40 Ar/39 Ar ages and synthesis

P-T data of Ky-St-Grt gneisses hosting HP amphibolites and eclogites from the Austroalpine Polinik complex, Kreuzeck Mountains, Eastern Alps, Austria

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Sequence of Thrusting Within A Thick‐Skinned Tectonic Wedge: Evidence From40Ar/39Ar and Rb‐Sr Ages From the Austroalpine Nappe Complex of the Eastern Alps

Cited by 37 publications

References 0 publications

Early Palaeozoic tectonothermal events in basement complexes of the eastern Greywacke Zone (Eastern Alps): evidence from U-Pb zircon data

Early Palaeozoic tectonothermal events in basement complexes of the eastern Greywacke Zone (Eastern Alps): evidence from U-Pb zircon data

Tectonothermal history of the basement rocks within the NW Dinarides: new40 Ar/39 Ar ages and synthesis

P-T data of Ky-St-Grt gneisses hosting HP amphibolites and eclogites from the Austroalpine Polinik complex, Kreuzeck Mountains, Eastern Alps, Austria

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Sequence of Thrusting Within A Thick‐Skinned Tectonic Wedge: Evidence From⁴⁰Ar/³⁹Ar and Rb‐Sr Ages From the Austroalpine Nappe Complex of the Eastern Alps