Austro-Alpine Basement Complex to the South of the Tauern Window

Schulz, Bernhard; Nollau, Günter; Heinisch, H.; Godizart, G.

doi:10.1007/978-3-642-84640-3_30

Cited by 10 publications

(13 citation statements)

References 17 publications

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“…Their main characteristics are presented and were detailed in Behrmann (1990), Bücksteeg (1999), Schulz et al (1993Schulz et al ( , 2001, Schulz (1995Schulz ( , 1997 and Schulz and Bombach (2003).…”

Section: Lithological Units South Of the Tauern Windowmentioning

confidence: 98%

“…The Austroalpine basement south of the Tauern Window presumably involves the post-Early-Ordovician Thurntaler Phyllite Group, and lithologies appearing in several pre-Early-Ordovician basement units (Schulz et al 1993(Schulz et al , 2001. They can be related to the Noric Composite terrane and the Celtic terrane, as established by Frisch and Neubauer (1989).…”

Section: Introductionmentioning

confidence: 98%

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Neoproterozoic to Early-Palaeozoic magmatic evolution in the Gondwana-derived Austroalpine basement to the south of the Tauern Window (Eastern Alps)

Schulz¹,

Bombach

Pawlig³

et al. 2004

Int J Earth Sci (Geol Rundsch)

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In the Austroalpine Basement to the south of the Tauern Window, distinct suites of metabasites occur with orthogneisses in pre-Early-Ordovician units. Tholeiitic and alkaline within-plate basalt-type metabasites are associated with acid meta-porphyroids in the post-Early-Ordovician Thurntaler Phyllite Group. According to their correlated trace element abundances, metabasite zircons crystallized with their host rocks. Protolith Pb-Pb zircon ages, wholerock Ta/Yb-Th/Yb and oxygen, Sr, Nd isotope data define two principal evolution lines. An older evolution at elevated Th/Yb typical of subduction-related magmatism, started by 590-Ma N-MORB-type and 550-530 Ma volcanic arc basalt type basic suites, which mainly involved depleted mantle sources. It finished with mainly crustalsource 470-450-Ma acid magmatites. An other evolution line by tholeiitic and 430-Ma alkaline within-plate basalttype suites in both pre-and post-Early-Ordovician units is characterized by an intraplate mantle metasomatism and enrichment trend along multicomponent sources. These magmatic evolution lines can be related to a plate tectonic scenario that involved terranes in a progressively mature Neoproterozoic to Ordovician active margin, and a subsequent Palaeo-Tethys passive margin along the north Gondwanan periphery.

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Section: Lithological Units South Of the Tauern Windowmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Neoproterozoic to Early-Palaeozoic magmatic evolution in the Gondwana-derived Austroalpine basement to the south of the Tauern Window (Eastern Alps)

Schulz¹,

Bombach

Pawlig³

et al. 2004

Int J Earth Sci (Geol Rundsch)

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“…According to the microstructural positions it is possible to distinguish among syn-Ll-$1 or pre-L~-S2 albites in the interstitial space or as porphyroblasts in microlithons, syn-Lz-Sz albites (sometimes with thin oligoclase rims) elongated parallel to L2-Sa and post-L2-Sz porphyroblasts Tollmann (1977). Amphibolites of pre-Variscan origin (Schulz et al, 1993) occur with biotite gneisses and mylonific orthogneisses in the Austroalpine basement immediately to the south of the Matreier zone. These metabasites with a W-E striking mineral lineation by preferentially oriented amphiboles were sampled in the Kleinklausen-Tal (HUh) and in the upper Buinlandtal (Bui5, Bui20) to the south of the Ahrntal (Fig.…”

Section: Fic 3 (A)-(g)mentioning

confidence: 99%

Microstructures and mineral chemistry in amphibolites from the western Tauern Window (Eastern Alps), and P-T deformation paths of the Alpine greenschist-amphibolite facies metamorphism

Schulz¹,

Triboulet

Audren

1995

Mineral. mag.

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Amphibolites in the Mesozoic part of the parautochthonous Lower Schieferh~ille (LSH), the allochthonous Upper Schieferh~ille (USH) and the overlying Austroalpine basement (AA) in and around the western Tauern Window (Eastern Alps) suffered a progressive Alpine deformation. Lineations and foliations L1-S1, L2-$2 defined by preferentially oriented (Na-Ca) amphiboles as well as F3 folds and further foliations Smy I and $4 in the metabasites are structures of successive deformational stages with a constant W-E main extension axis of strain. The (Na-Ca) amphiboles in assemblages with epidote, chlorite, albite/oligoclase and quartz are zoned with similar continuous zonation trends from early actinolite in the cores to magnesio-hornblende and tschermakitic hornblende, and from magnesio-hornblende to late actinolite in the rims in the three lithostratigraphic units. Geothermobarometry involving tremolite-edenite and (pargasite-hastingsite)-tremolite end-member equilibria in amphiboles allowed us to reconstruct prograde-retrograde P-T paths for the Alpine greenschist-amphibolite facies event. The paths passed P.,'Trnax at 6--7 kbar/600~ Similar shapes of the paths in AA, USH and Mesozoic LSH indicate a common metamorphic history and a stacking of these units prior to or during the pre-Pmax evolution. Moderate P-T ratios are characteristic for the temperature-dominated compression paths and indicate continental collisional rather than subduction zone metamorphism. The middle to late Alpine greenschist-amphibolite facies event appears as an independent metamorphism along a complete P-T loop which may have followed an earlier and poorly documented highpressure/low-temperature event.

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“…The Eastern Alps to the south of the Tauern Window can be subdivided into four different tectonometamorphic units (Schulz et al 1993;Fig. 1).…”

Section: Geological Settingmentioning

confidence: 99%

“…The basement complex between the Tauern Window and the Pustertal-Line (see Fig. 1) belongs to the southern, proximal part of the Austroalpine nappes surrounding the Penninic Zone and the Tauern Window [for a compilation, see Schulz et al (1993Schulz et al ( , 2001]. The geotectonic history of these basement units records the evolution of the northern margin of Gondwana and the northward drift of Avalonia and Armorica towards the southern margin of Laurentia and Baltica.…”

Section: Introductionmentioning

confidence: 97%

Age constraints on the evolution of the Austroalpine basement to the south of the Tauern Window

Siegesmund¹,

Heinrichs²,

Romer

et al. 2006

Int J Earth Sci (Geol Rundsch)

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The Austroalpine basement to the south of the Tauern Window once was part of the northern margin of Gondwana. It includes the ''Altkristallin'' and the phyllitic Thurntaler Complex. In the Altkristallin (AMU, MPU), suites of arc-related metamafic sequences occur together with calc-alkaline metagranite. SHRIMP U-Pb dating of zircon from calc-alkaline metagranite associated with an eclogitic amphibolite give an age of 470 ± 3 Ma interpreted as the age of protolith emplacement. In the Thurntaler Complex, metaporphyroids occur together with tholeiitic as well as alkaline within-plate basalt-type metabasite. The metaryholites of this association give a crystallization SHRIMP age of 477 ± 4 Ma, which suggests contemporaneity of arc-related and extensional settings in the Austroalpine basement units. The age data demonstrate widespread magmatic activity associated with the Early-Ordovician amalgamation at the end of the 550-470 Ma subduction-accretioncollision cycle. The Pb-Pb and U-Pb systematics of step-wise leached staurolite and kyanite from the peakmetamorphic assemblage of the Altkristallin indicate that (1) step-wise leaching of staurolite and kyanite yields the age of inclusions rather than the host; (2) zircon inclusions in staurolite suggest an Ordovician or older age for the precursor of the staurolite-schists; (3) the weighted average of the 206 Pb/ 238 U data of the various leaching steps yields a Variscan age for the inclusions (ilmenite, biotite, and andesine). Since these inclusions are part of the metamorphic mineral assemblage, this age provides a minimum estimate for staurolite growth, i.e., metamorphism. Thus, the Pb-Pb and U-Pb systematics of staurolite provide evidence for a Variscan metamorphism of the Austroalpine basement, e.g., MPU, AMU and Thurntaler Complex, to the south of the Tauern Window.

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Austro-Alpine Basement Complex to the South of the Tauern Window

Cited by 10 publications

References 17 publications

Neoproterozoic to Early-Palaeozoic magmatic evolution in the Gondwana-derived Austroalpine basement to the south of the Tauern Window (Eastern Alps)

Neoproterozoic to Early-Palaeozoic magmatic evolution in the Gondwana-derived Austroalpine basement to the south of the Tauern Window (Eastern Alps)

Microstructures and mineral chemistry in amphibolites from the western Tauern Window (Eastern Alps), and P-T deformation paths of the Alpine greenschist-amphibolite facies metamorphism

Age constraints on the evolution of the Austroalpine basement to the south of the Tauern Window

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