Eocene high pressure metamorphism in the Penninic units of the Tauern Window (Eastern Alps): evidence from40Ar?39Ar dating and petrological investigations

Zimmermann, Rolf; Hammerschmidt, Konrad; Franz, Gerhard

doi:10.1007/bf00286841

Cited by 83 publications

(50 citation statements)

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“…This observation of a complete greenschistamphibolite-greenschist facies P-T loop contrasts the interpretations of Holland and Ray (1985) and Zimmermann et al (1994) for the central Tauern Window with that of Selverstone and Spear (1985) for the western Tauern Window. These authors assigned the glaucophane-lawsonite or blueschist facies and the greenschist-amphibolite facies metamorphic stages in the USH to a common P-T loop (Fig.…”

Section: Conclusion and Implications To Tectonic Modelscontrasting

confidence: 90%

“…A first and presumably early-Alpine highpressure event at 550-600~ kbar is documented by rocks of the Eclogite zone (Miller, 1977;Miller et al, 1980;Holland, 1979;Spear and Franz, 1986;Frank et al, 1987) which show Eocene (36 Ma) Ar-Ar cooling ages (Zimmermann et al, 1994). Relics of a second metamorphic event around 450~ 7-9 kbar at 90-60 Ma (Holland and Richardson, 1979;Raith et al, 1978; or younger as Upper Eocene (Zimmermann et al, (1994), referred to as the blueschist or glaucophane-lawsonite event, occur in some metabasites of the Eclogite zone. Holland and Ray (1985) described crossite and jadeitic pyroxene from metabasites of the USH.…”

Section: Regional Metamorphic and Structural Settingmentioning

confidence: 99%

“…In the LSH, prograde P-T paths from Cooling ages (13-30 Ma) for this P-T path are taken from Borsi et al (1978), Raith et al (1978), Blanckenburg et al (1989), Christensen et al (1994) and Zimmermann et al (1994. P-T data for the Alpine blueschist facies event MA1 and the greenschist-amphibolite facies event MA2 are from Holland and Ray (1985), Dachs (1990) Zimmermann et al (1994) (Z). The P-Tpaths (grt) from USH and Palaeozoic LSH garnet-bearing rocks (Selverstone, 1993) with Rb-Sr ages (Christensen et al, 1994) are shown for comparison.…”

Section: /(+'L En;:i' (Us'h) (H) Neva7 (Ush)mentioning

confidence: 99%

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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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Section: Conclusion and Implications To Tectonic Modelscontrasting

confidence: 90%

Section: Regional Metamorphic and Structural Settingmentioning

confidence: 99%

Section: /(+'L En;:i' (Us'h) (H) Neva7 (Ush)mentioning

confidence: 99%

See 1 more Smart Citation

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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“…We are well aware of the problems that arise when interpreting radiometric data in terms of the timing of eclogite-facies metamorphism in parts of the Glockner Nappe system and in the Eclogite Zone (Thöni 2006). Although no direct radiometric data are available for the age of eclogite-facies overprint of the Glockner Nappe system, this overprint is likely to have immediately predated the 36-32 Ma age range obtained by Zimmermann et al (1994) for blueschist-facies metamorphism related to subsequent exhumation. Also, it is likely that high-pressure overprint in the Glockner Nappe system occurred more or less contemporaneously with that of the Bündnerschiefer of the Engadine Window, also attributed to the Valais Ocean and reported to have occurred some 42-40 Ma ago (Wiederkehr et al 2008(Wiederkehr et al , 2009).…”

Section: Tectonic Evolution Of the Tauern Windowmentioning

confidence: 99%

“…Partly they are based on own observations. The lithologies are indicated with numbers, 1.9-2.2 GPa and 600-630°C (Hoschek 2001) were reached at 45-40 Ma (Zimmermann et al 1994;Ratschbacher et al 2004;Kurz et al 2008), followed by a first stage of decompression lasting to 32 Ma. Later, reheating to amphibolite-facies conditions (Tauernkristallisation) affected the entire nappe stack including the Venediger Duplex (see Glodny et al 2008 for a differing view regarding timing).…”

Section: Eclogite Zonementioning

confidence: 99%

The Tauern Window (Eastern Alps, Austria): a new tectonic map, with cross-sections and a tectonometamorphic synthesis

et al. 2013

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We present a tectonic map of the Tauern Window and surrounding units (Eastern Alps, Austria), combined with a series of crustal-scale cross-sections parallel and perpendicular to the Alpine orogen. This compilation, largely based on literature data and completed by own investigations, reveals that the present-day structure of the Tauern Window is primarily characterized by a crustal-scale duplex, the Venediger Duplex (Venediger Nappe system), formed during the Oligocene, and overprinted by doming and lateral extrusion during the Miocene. This severe Miocene overprint was most probably triggered by the indentation of the Southalpine Units east of the Giudicarie Belt, initiating at 23-21 Ma and linked to a lithosphere-scale reorganization of the geometry of mantle slabs. A kinematic reconstruction shows that accretion of European lithosphere and oceanic domains to the Adriatic (Austroalpine) upper plate, accompanied by highpressure overprint of some of the units of the Tauern Window, has a long history, starting in Turonian time (around 90 Ma) and culminating in Lutetian to Bartonian time (45-37 Ma).

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A new detrital mica ⁴⁰Ar/³⁹Ar dating approach for provenance and exhumation of the Eastern Alps

et al. 2017

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Detrital thermochronology can be used as a tool to quantitatively constrain exhumation rates and its spatial variability from active mountain belts. Commonly used methods for this purpose assume a steady state relationship between tectonic uplift and erosion. However, this assumption does not account for the transitory response of a dynamic orogenic system to changes in the boundary conditions. We propose a different approach that uses the observed detrital age distributions as “markers” of the past exhumation and of the present‐day erosion and mixing occurring in a river system. In this paper, we present new 40Ar/39Ar biotite and white mica age distributions for 19 modern river sands from the Eastern Alps north of the Periadriatic line. The results present three main clusters of ages at ~0.5–50, ~60–120, and ~250–350 Ma that record the main orogenic phases in this sector of the Alps. We have applied two numerical methods to the cooling ages to (a) linearly compute the spatial variability of the relative present‐day erosion of a set of four detrital mineral samples from drainage basins along the Inn River and (b) quantify the rates of the cooling and erosion in the Tauern Window during Paleocene‐Miocene time of the Alpine orogeny. Our results suggest a 0.34–0.84 mm/yr range of exhumation rates for the Tauern Window since the Miocene. Our estimates of exhumation rates of the western Tauern Window are higher than those for the eastern Tauern Window, which is consistent with the previous studies.

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Eocene high pressure metamorphism in the Penninic units of the Tauern Window (Eastern Alps): evidence from40Ar?39Ar dating and petrological investigations

Cited by 83 publications

References 30 publications

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

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

The Tauern Window (Eastern Alps, Austria): a new tectonic map, with cross-sections and a tectonometamorphic synthesis

A new detrital mica ⁴⁰Ar/³⁹Ar dating approach for provenance and exhumation of the Eastern Alps

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Eocene high pressure metamorphism in the Penninic units of the Tauern Window (Eastern Alps): evidence from40Ar?39Ar dating and petrological investigations

Cited by 83 publications

References 30 publications

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

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

The Tauern Window (Eastern Alps, Austria): a new tectonic map, with cross-sections and a tectonometamorphic synthesis

A new detrital mica 40Ar/39Ar dating approach for provenance and exhumation of the Eastern Alps

Contact Info

Product

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A new detrital mica ⁴⁰Ar/³⁹Ar dating approach for provenance and exhumation of the Eastern Alps