The metamorphic evolution of migmatites from the Ötztal Complex (Tyrol, Austria) and constraints on the timing of the pre-Variscan high-T event in the Eastern Alps

Thöny, Werner F.; Tropper, Peter; Schennach, Friederike; Krenn, Erwin; Finger, Friedrich; Kaindl, Reinhard; Bernhard, Franz; Hoinkes, G.

doi:10.1007/978-3-7643-9950-4_7

Cited by 2 publications

(4 citation statements)

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“…EPMA Th-U-Pb monazite ages reveal Silurian partial melting mostly at ca. 441 Ma (Thöny et al 2008;Rode et al 2012), whereas Ordovician anatexis is supported by Pb-Pb evaporation and U-Pb TIMS zircon data at ca. 490-485 Ma (Klötzli-Chowanetz et al 1997).…”

Section: Tectonic and Paleogeographic Implicationsmentioning

confidence: 94%

“…In the Austroalpine basement, migmatites of the Ötztal-Stubai Complex record high-temperature/low-pressure metamorphism at ca. 670-750 °C and < 2.8 kbar (Thöny et al 2008). EPMA Th-U-Pb monazite ages reveal Silurian partial melting mostly at ca.…”

Section: Tectonic and Paleogeographic Implicationsmentioning

confidence: 97%

“…All studied Austroalpine units, namely the Ötztal-Stubai Complex, Rotenkogel Subgroup, Schneeberg Complex and Innsbruck Quartzphyllite Complex, seem to be pre-Carboniferous (see below), according to maximum sedimentation and metamorphic ages (Table 1), being thus coeval with other metasedimentary units of the Austroalpine basement (Heinrichs et al 2012;Siegesmund et al 2018 (Thöny et al 2008). Further evidence is provided by the U-Pb zircon age of ca.…”

Section: Age and Provenancementioning

confidence: 98%

“…The Ötztal-Stubai and Schneeberg Complexes are classical areas of polyphase deformation and metamorphism (Purtscheller 1978;Thöni 1999;Frisch et al 2000). An Early Paleozoic high-temperature anatectic event was reported from the Winnebach, Verpeil and Klopaier migmatites (Klötzli-Chowanetz et al 1997, 2001Neubauer et al 1999;Thöny et al 2008). Eclogite-facies and amphibolite-facies conditions were attained during the Devonian-Carboniferous Variscan metamorphism (Miller and Thöni 1995;Mogessie and Purtscheller 1986;Tropper and Hoinkes 1996;Rode et al 2012;Schulz et al 2019).…”

Section: Geological Settingmentioning

confidence: 99%

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The birth of the Alps: Ediacaran to Paleozoic accretionary processes and crustal growth along the northern Gondwana margin

Siegesmund

Oriolo

Schulz

et al. 2021

Int J Earth Sci (Geol Rundsch)

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New whole-rock geochemical and coupled U–Pb and Lu–Hf LA-ICP-MS zircon data of metasedimentary rocks of the Austroalpine, South Alpine and Penninic basement domains are presented, to disentangle the pre-Variscan tectonic evolution of the proto-Alps. The studied units seem to record distinct stages of protracted Late Ediacaran to Carboniferous tectonosedimentary processes prior to the Variscan collision. In the case of Austroalpine and South Alpine units, nevertheless, no major differences in terms of provenance are observed, since most detrital zircon samples are characterized by a major Pan-African peak. Their detrital zircon spectra record a provenance from the northeastern Saharan Metacraton and the Sinai basement at the northern Arabian-Nubian Shield, being thus located along the eastern Early Paleozoic northern Gondwana margin, whereas sources located further west are inferred for the Penninic Unit, which might have been placed close to the Moldanubian Unit of the Bohemian Massif. In any case, it is thus clear that the Alpine basement remained in a close position to the Gondwana mainland at least during the Early Paleozoic. The Late Ediacaran to Silurian tectonic evolution, which includes Cadomian and Cenerian tectonometamorphic and magmatic processes, seem thus to record a continuum related to a retreating-mode accretionary orogen, with diachronous back-arc basin opening and possibly discrete compressional/transpressional pulses linked to changes in subduction zone dynamics. On the other hand, it is inferred that the Alpine basement essentially comprises Pan-African metasedimentary and subordinate metaigneous rocks, possibly with very few Early Neoproterozoic relics. This basement was significantly reworked during the protracted Paleozoic orogenic evolution, due to anatexis and/or assimilation by mantle-derived juvenile magmatism.

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Section: Tectonic and Paleogeographic Implicationsmentioning

confidence: 94%

Section: Tectonic and Paleogeographic Implicationsmentioning

confidence: 97%