Unravelling the pre-Variscan evolution of the Habach terrane (Tauern Window, Austria) by U-Pb SHRIMP zircon data

Eichhorn, Roland; Loth, Georg; Kennedy, Allen

doi:10.1007/s004100100284

Cited by 29 publications

(21 citation statements)

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“…As regards the remaining detrital zircons and inherited cores, their ages are similar to those in other Alpine areas, e.g., Tauern Window (Eastern Alps, Eichhorn et al 2001), Ivrea Zone (Central Alps, Vavra et al 1996) and Betic Rift Belt (Zeck & Whitehouse 1999;Zeck & Williams 2001). The Paleoproterozoic-Pan-African zircon age patterns generally correspond to those established for the Hercynian basement in Southern Europe, which is considered to be reworked Gondwana crust.…”

Section: Discussionmentioning

confidence: 72%

U-Pb SHRIMP zircon dating of andesite from the Dolomite area (NE Italy): geochronological evidence for the early onset of Permian Volcanism in the eastern part of the southern Alps

Visonà¹,

Fioretti

Poli

et al. 2007

Swiss j geosci

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The Athesian Volcanic District (AVD), a thick sequence of andesitic to rhyolitic lava and ignimbrite, overlies both the Variscan basement of the Dolomites and, where present, the continental basal conglomerate of Upper Carboniferous(?) to Early Permian age. This volcanic activity is known to mark the margin of the intra-Pangea megashear system between Gondwana and Laurasia, the onset age of which is determined in this study. SHRIMP U-Pb dating on zircon from Ponte Gardena/Waidbruck (Isarco/Eisack valley) basaltic andesite yields an age of 290.7 ± 3 Ma, providing the oldest record of andesite volcanic activity yet documented in the AVD. Two younger dates (279.9 ± 3.3 and 278.6 ± 3.1 Ma) obtained for the andesitic necks of M. dei Ginepri (Eores/Aferer valley) and Col Quaternà (western Comelico), respectively, probably represent a second pulse of andesite magmatic activity.Near Chiusa/Klausen, the volcanoclastic deposits at the bottom of the Funes/Villnöss valley volcano-sedimentary complex only contain detrital zircons, dated at 469 ± 6 Ma; these probably derive from erosion of Paleozoic porphyroids. Other zircons from the same sediments and inherited cores of magmatic andesite crystals give

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Section: Discussionmentioning

confidence: 72%

U-Pb SHRIMP zircon dating of andesite from the Dolomite area (NE Italy): geochronological evidence for the early onset of Permian Volcanism in the eastern part of the southern Alps

Visonà¹,

Fioretti

Poli

et al. 2007

Swiss j geosci

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“…MORB-type metabasites seem to be related to ZEV and MariµnskØ Lµzně Complex metabasites representing the products of continental or oceanic rifting (O'Brien et al, 1997). Convergent conditions in the Upper Vendian and Lower Ordovician favour a position of the "Bayerischer Wald" in the "eastern" prolongation of terranes of the northern Gondwana margin, probably in close relation to the Habach terrane (proto-Alps; Eichhorn et al, 2001) as suggested by geochronological and geodynamic similarities.…”

Section: Discussionmentioning

confidence: 90%

“…Consequently, the "Bayerischer Wald" is tentatively placed at an"eastern" position in the chain of Gondwana-derived terranes in the Lower Ordovician. The presumed, Lower Ordovician position of the "Bayerischer Wald" is supported by geochronological and geotectonic similarities with the Habach terrane (Tauern Window; Eichhorn et al, 2001); the latter is part of the pre-Variscan basement of the Alps (proto-Alps), which can be seen as the "eastern" extension of the peri-Gondwana terranes (Schätz et al, 2002;Tait et al, 2000;von Raumer et al, 2002).…”

Section: Upper Vendian Magmatism (~550 Ma)mentioning

confidence: 97%

“…Palaeomagnetic data indicate that crustal fragments of the ATA independently separated from Gondwana in the Ordovician between~470 and~440 Ma and drifted towards Laurentia and Baltica (Schätz et al, 2002;Tait et al, 1997Tait et al, , 2000. A wealth of geochronological data exists for most parts of the ATA and neighbouring areas for Neoproterozoic to Ordovician, palaeogeographic reconstructions (Bues et al, 2002;Chen et al, 2000;Dörr et al, 2002;Eichhorn et al, 2001;Friedl, 2000;Hegner and Kröner, 2001;Kemnitz et al, 2002;Kröner and Hegner, 1998;Linnemann et al, 2000;Pin and Marini, 1993;Schaltegger et al,1997;von Quadt,1997;von Raumer et al, 2002;Zulauf et al, 1997Zulauf et al, , 1999.…”

Section: Introductionmentioning

confidence: 96%

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U-Pb SHRIMP and Nd isotopic data from the western Bohemian Massif (Bayerischer Wald, Germany): Implications for Upper Vendian and Lower Ordovician magmatism

Teipel

Eichhorn

Loth

et al. 2004

Int J Earth Sci (Geol Rundsch)

141

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U-Pb SHRIMP dating of zircons of metamagmatites from the Bayerischer Wald (Germany) reveals a complex evolution of this section of the Moldanubian Zone exposed in the western Bohemian Massif of the central European Variscan belt. In the south-western part of the Bayerischer Wald Upper Vendian magmatism is constrained by pooled 206 Pb/ 238 U mean ages of 555€12, 549€7 and 549€6 Ma from metarhyolites and a metabasite. Inherited zircon cores were not observed. Zircon overgrowths, yielding pooled 206 Pb/ 238 U ages of 316€10 and 319€5 Ma, provide evidence for Variscan metamorphic zircon growth; cathodoluminescence imaging reveals a two-stage metamorphic overprint. In contrast, Lower Ordovician magmatism and anatexis are documented in the north-eastern parts of the Bayerischer Wald by metagranitoids (480€6, 486€7 Ma), an eclogitic metabasite (481€8 Ma) and a leucosome (491 to 457 Ma). Inherited zircon cores are found in Lower Ordovician metagranitoids and the leucosome, indicating a Palaeoproterozoic-Archaean (ca. 2.7, 2.0 Ga) source region, presumably of Gondwana affinity (West African craton), and documenting Cadomian magmatism (ca. 640 Ma). Post-Cadomian metamorphism is inferred from concordant ages of 433€4 and 431€7 Ma. Upper Vendian magmatism is assumed at an active continental margin with ensialic back-arc development ( Nd(t) -3.01 to +1.22); the lack of inherited zircon is due to either derivation from juvenile (?volcanic arc) material or complete isotopic resetting of pre-existing zircon. An active continental margin setting, possibly with some lateral variation (accretion/collision) is envisaged for the Lower Ordovician, producing granitoids, rhyolites and leucosomes ( Nd(t) -0.5 to -6.27); MORB-type metabasites may be related to ZEV or MariµnskØ Lµzně Complex metabasites. A tentative palaeogeographic reconstruction puts the "Bayerischer Wald" in close relationship with the Habach terrane (proto-Alps), as the "eastern" extension of terranes of the northern Gondwana margin.

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“…2.3) from the western Tauern Window yielded zircon with ages of 534 ± 9.4 Ma . Pre-Variscan ages (Eichhorn et al 2001;Kebede et al 2005) were also found for a part of the so-called and poorly defined ''Habach Series'' of the central part of the Tauern Window (Frasl 1958;Höck 1993), specifically for the Lower Habach Formation or Lower Magmatic Sequence as defined by Kebede et al (2005). This is a meta-ophiolitic association that comprises mafic and ultramafic series belonging to the TuxGranatspitz Nappe of the central Tauern Window (Fig.…”

Section: Variscan Basementmentioning

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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Unravelling the pre-Variscan evolution of the Habach terrane (Tauern Window, Austria) by U-Pb SHRIMP zircon data

Cited by 29 publications

References 0 publications

U-Pb SHRIMP zircon dating of andesite from the Dolomite area (NE Italy): geochronological evidence for the early onset of Permian Volcanism in the eastern part of the southern Alps

U-Pb SHRIMP zircon dating of andesite from the Dolomite area (NE Italy): geochronological evidence for the early onset of Permian Volcanism in the eastern part of the southern Alps

U-Pb SHRIMP and Nd isotopic data from the western Bohemian Massif (Bayerischer Wald, Germany): Implications for Upper Vendian and Lower Ordovician magmatism

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

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