Fluid-controlled crustal metasomatism within a high-pressure subducted mélange (Mt. Hochwart, Eastern Italian Alps)

Tumiati, Simone; Godard, Gaston; Martin, Silvana; Klötzli, Urs; Monticelli, Damiano

doi:10.1016/j.lithos.2006.06.009

Cited by 34 publications

(21 citation statements)

References 21 publications

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“…Two groups of cores could be distinguished in this sample, one with a concordia age of 600 ± 55 Ma, in agreement with data from inherited zircons in the overlying Austroalpine units as well as in the Southalpine basement in this area. The second group is only poorly defined (316 ± 98 Ma), and these cores could have been formed during the Variscan metamorphism present in both of the adjacent basement complexes Thöni (1980;Del Moro et al 1982;Meli 1995;Sassi et al 2004;Tumiati et al 2007). The rims yield an age of 35 ± 1 Ma; hence, the last zircon growth phase in this intrusion is slightly older than in the before-described sample.…”

Section: Datamentioning

confidence: 99%

The Northern Giudicarie and the Meran-Mauls fault (Alps, Northern Italy) in the light of new paleomagnetic and geochronological data from boudinaged Eo-/Oligocene tonalites

Pomella

Klötzli

Scholger

et al. 2010

Int J Earth Sci (Geol Rundsch)

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This study concentrates on small intrusions along two important faults of the Giudicarie fault system, the Northern Giudicarie and the Meran-Mauls fault, summarised under the term tonalitic lamellae. Magnetic fabric analyses in combination with structural field data indicate dextral strike slip deformation along the NE-SW striking northern part of the Giudicarie fault system, the Meran-Mauls fault, overprinted by younger thrusting. The regional stressfield was oriented approximately NNW-SSE during Tertiary times.

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Section: Datamentioning

confidence: 99%

The Northern Giudicarie and the Meran-Mauls fault (Alps, Northern Italy) in the light of new paleomagnetic and geochronological data from boudinaged Eo-/Oligocene tonalites

Pomella

Klötzli

Scholger

et al. 2010

Int J Earth Sci (Geol Rundsch)

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“…The latter hypothesis is supported by the observation (Ersoy et al 2012b) that the mantle source composition of the Miocene SHO-UK volcanic rocks is comparable to crustally contaminated mantle peridotites from the Ulten Zone Alpine peridotites (Marocchi et al 2007;Rampone and Morten 2001;Scambelluri et al 2006;Tumiati et al 2007). In addition, recent boron isotope studies of the MCC also support the hypothesis (Kinzler 1997) and olivine 0.60 (0.03) + orthopyroxene 0.20 (−0.16) + clinopyroxene 0.10 (0.88) + garnet 0.10 (0.09) (Walter 1998).…”

Section: Source Enrichment Processes and Mantle Compositionmentioning

confidence: 87%

“…The melting models do, however, indicate that the mantle source contains ~3 % garnet, because higher garnet amounts in the source would resulted in a much steeper rise in Tb/Yb ratios than the trend shown by the volcanics, and vice versa. Marocchi et al 2007;Rampone and Morten 2001;Scambelluri et al 2006;Tumiati et al 2007) with phlogopite harzburgite mineralogy as starting material. Mineral modal abundances (melt modes in parentheses) for phlogopite harzburgite is olivine 0.69 (0.15) + orthopyroxene 0.10 (0.17) + clinopyroxene 0.03 (0.27) + garnet 0.03 (0.05) + phlogopite 0.14 (0.35) + spinel 0.01 (0.01) (from Williams et al 2004).…”

Section: Partial Melting and Magma Generationmentioning

confidence: 99%

40Ar/39Ar geochronology, geochemistry and petrology of volcanic rocks from the Simav Graben, western Turkey

Semiz

Ersoy

Özpinar

et al. 2015

Contrib Mineral Petrol

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Mediterranean. All the rock groups have similar and high abundances of incompatible trace elements, and radiogenic Sr. Geochemical modeling of the trace element and isotopic ratios of the samples reveals that both the SHO-UK and HKCA groups were derived from a common mantle source which had been highly metasomatized and enriched by continental materials during partial subduction of the crustal metamorphic slices in a continental collision setting. The geochemical variations of these rocks were mainly controlled by source characteristics (such as heterogeneity) and variable degrees of partial melting and subsequent effects of fractional crystallization, with low degrees of crustal contamination. The HKCA series were derived by higher degrees of partial melting of the lithospheric mantle source than the SHO-UK rocks. The HKCA rocks then underwent two-stage fractional crystallization (clinopyroxene-dominated followed by feldspar-dominated fractionating mineral assemblages) to form the high-K calc-alkaline basalt to rhyolite series, whereas the SHO-UK rocks experienced comparatively little fractional crystallization. A tectonic scenario involving the rapidly extending and thinning of orogenic crust is compatible with the time-dependent compositional variation of the magmatic rocks.

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“…2) is documented at 350 Ma for the Silvretta (Ladenhauf et al 2001) and Ö tztal basement units (Miller and Thöni 1995;Thöni 2006), as well as at 336 Ma for the Nonsberg-Ulten zone (Tumiati et al 2003(Tumiati et al , 2007. The time difference of about 15 Ma between the Silvretta-Ö tztal eclogites and the high-pressure association, including eclogites, migmatites and mantle peridotites, of the Ulten zone (Tumiati et al 2003) suggests that eclogite metamorphism within the Austroalpine basement was diachronous.…”

Section: The Variscan Orogenymentioning

confidence: 96%

“…Migmatite formation at 490 Ma in the Winnebach area (WM) is closely coeval with the opening of the ocean documented by Chamrousse ophiolite (Helvetic Belledonne Massif), and suggests that the Austroalpine basement has been involved in the extensional tectonics that resulted in the oceanisation of the back-arc in the Middle Cambrian. Variscan eclogites (Vec) in Silvretta and Ö tztal basements formed at 350 Ma (Thöni 2006), whilst in Nonsberg-Ulten area, south of Meran (M), eclogites formed at 336 Ma (Tumiati et al 2003(Tumiati et al , 2007. In Silvretta and Ö tztal basements, mega-folds with subvertical axes formed during the Variscan orogeny (''Schlingen-Tektonik'': ST).…”

Section: The Cambrian-ordovician Cyclementioning

confidence: 99%

The crystalline basement of the Adria microplate in the eastern Alps: a review of the palaeostructural evolution from the Neoproterozoic to the Cenozoic

Spiess

Cesare

Mazzoli

et al. 2010

Rend. Fis. Acc. Lincei

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The frontal northern part of the continental Adriatic microplate is formed by a stack of Austroalpine nappes and by the Southalpine basement and cover units. Both basement portions are now side by side, separated by the Periadriatic (Insubric) fault system, but they became juxtaposed only during the Alpine orogeny. Permian HT-LP metamorphism is now recognised also within the Austroalpine basement of the eastern Alps, whilst it was known since long in the Southalpine basement. High thermal heat flow responsible for HT-LP metamorphism is related to the extensional tectonics and lithospheric thinning during the Permian and by concurrent magmatic underplating. During the Variscan orogeny, eclogite facies metamorphism is documented within the Ö tztal and the Silvretta basements (350 Ma), as well as within the Nonsberg-Ulten unit (336 Ma). The HP events in the Ö tztal and the Silvretta basements correlate temporarily with the closure of the Rheic Ocean between the Hanseatic and the Galatian terranes. Docking of the Galatian-Hanseatic composite terrane with Laurussia resulted in large-scale strike-slip tectonics and potentially in the formation of mega-folds (''Schlingen'') within the Austroalpine basement during the Visean. Palaeo-Tethys ridge subduction may be responsible for fast decompression and isobaric heating documented within the Ö tztal basement. The Palaeozoic sedimentary sequences of the Austroalpine and the Southalpine phyllitic complexes testify that from Silurian to Devonian, both basement portions were in a passive margin position. During the Cambrian-Ordovician, the Austroalpine basement occupied a position along the leading edge of Gondwana facing the Proto-Tethys Ocean. The compositional variation of the intruded granitic suites confirm an evolution from a magmatic arc towards a collisional-type geodynamic setting related to the closure of the previously opened back-arc basins.

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Fluid-controlled crustal metasomatism within a high-pressure subducted mélange (Mt. Hochwart, Eastern Italian Alps)

Cited by 34 publications

References 21 publications

The Northern Giudicarie and the Meran-Mauls fault (Alps, Northern Italy) in the light of new paleomagnetic and geochronological data from boudinaged Eo-/Oligocene tonalites

The Northern Giudicarie and the Meran-Mauls fault (Alps, Northern Italy) in the light of new paleomagnetic and geochronological data from boudinaged Eo-/Oligocene tonalites

40Ar/39Ar geochronology, geochemistry and petrology of volcanic rocks from the Simav Graben, western Turkey

The crystalline basement of the Adria microplate in the eastern Alps: a review of the palaeostructural evolution from the Neoproterozoic to the Cenozoic

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