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Alpine convergence record in the Carboniferous Badstub Formation, Upper Austroalpine basement nappes, Austria.

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Title: Alpine convergence record in the Carboniferous Badstub Formation, Upper Austroalpine basement nappes, Austria.
Authors: Zanoni, Davide, Filippi, Marco, Roda, Manuel, Regorda, Alessandro, Spalla, Maria Iole
Source: International Geology Review; Jan2024, Vol. 66 Issue 2, p633-658, 26p
Subject Terms: BASEMENTS, VEINS (Geology), SUBDUCTION, OROGENIC belts, ECLOGITE, GEOTHERMOMETRY
Geographic Terms: AUSTRIA
Abstract: Within the Carboniferous of Nötsch, the Badstub Formation is a clastic sequence of the Upper Austroalpine basement nappes exposed few kilometres north of the Periadriatic Fault System (Carinthia, Austria). Although these rocks preserve pristine sedimentary features, multi-scale structural analysis disclosed a syn-metamorphic foliation in fine-grained rocks, sets of mineralized faults, veins, and corona textures. Vein fillings and coronas contain equilibrium mineral assemblages with prehnite, pumpellyite, chlorite, phengitic mica, winchite, and riebeckite. Thermodynamic modelling and geothermometry constrain metamorphic conditions at 260–310°C and 0.25–0.50 GPa that are consistent with a temperature/depth ratio of about 20°C km−1. In a 2D thermomechanical model this thermal state is reached either in the upper or lower continental plate during convergence. Thus, during the Alpine convergence, the Badstub rocks were buried from the shallow crust at depths between 13 and 18 km either by ablative oceanic subduction or by continental subduction of the passive margin, and eventually stacked into the orogenic wedge at the Adria margin. During the downward and upward paths, the Badstub rocks were translated as a coherent poorly strained block. This first quantitative constraint on metamorphism for these Carboniferous rocks is consistent with the Upper Austroalpine basement nappes being a tectonic system that recorded the Alpine convergence under eclogite to prehnite–pumpellyite facies conditions. [ABSTRACT FROM AUTHOR]
Copyright of International Geology Review is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Alpine convergence record in the Carboniferous Badstub Formation, Upper Austroalpine basement nappes, Austria.
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  Data: <searchLink fieldCode="AR" term="%22Zanoni%2C+Davide%22">Zanoni, Davide</searchLink><br /><searchLink fieldCode="AR" term="%22Filippi%2C+Marco%22">Filippi, Marco</searchLink><br /><searchLink fieldCode="AR" term="%22Roda%2C+Manuel%22">Roda, Manuel</searchLink><br /><searchLink fieldCode="AR" term="%22Regorda%2C+Alessandro%22">Regorda, Alessandro</searchLink><br /><searchLink fieldCode="AR" term="%22Spalla%2C+Maria+Iole%22">Spalla, Maria Iole</searchLink>
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  Data: International Geology Review; Jan2024, Vol. 66 Issue 2, p633-658, 26p
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  Data: <searchLink fieldCode="DE" term="%22BASEMENTS%22">BASEMENTS</searchLink><br /><searchLink fieldCode="DE" term="%22VEINS+%28Geology%29%22">VEINS (Geology)</searchLink><br /><searchLink fieldCode="DE" term="%22SUBDUCTION%22">SUBDUCTION</searchLink><br /><searchLink fieldCode="DE" term="%22OROGENIC+belts%22">OROGENIC belts</searchLink><br /><searchLink fieldCode="DE" term="%22ECLOGITE%22">ECLOGITE</searchLink><br /><searchLink fieldCode="DE" term="%22GEOTHERMOMETRY%22">GEOTHERMOMETRY</searchLink>
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– Name: Abstract
  Label: Abstract
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  Data: Within the Carboniferous of Nötsch, the Badstub Formation is a clastic sequence of the Upper Austroalpine basement nappes exposed few kilometres north of the Periadriatic Fault System (Carinthia, Austria). Although these rocks preserve pristine sedimentary features, multi-scale structural analysis disclosed a syn-metamorphic foliation in fine-grained rocks, sets of mineralized faults, veins, and corona textures. Vein fillings and coronas contain equilibrium mineral assemblages with prehnite, pumpellyite, chlorite, phengitic mica, winchite, and riebeckite. Thermodynamic modelling and geothermometry constrain metamorphic conditions at 260–310°C and 0.25–0.50 GPa that are consistent with a temperature/depth ratio of about 20°C km<superscript>−1</superscript>. In a 2D thermomechanical model this thermal state is reached either in the upper or lower continental plate during convergence. Thus, during the Alpine convergence, the Badstub rocks were buried from the shallow crust at depths between 13 and 18 km either by ablative oceanic subduction or by continental subduction of the passive margin, and eventually stacked into the orogenic wedge at the Adria margin. During the downward and upward paths, the Badstub rocks were translated as a coherent poorly strained block. This first quantitative constraint on metamorphism for these Carboniferous rocks is consistent with the Upper Austroalpine basement nappes being a tectonic system that recorded the Alpine convergence under eclogite to prehnite–pumpellyite facies conditions. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of International Geology Review is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/00206814.2023.2206443
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        Text: English
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      – SubjectFull: VEINS (Geology)
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      – SubjectFull: GEOTHERMOMETRY
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      – TitleFull: Alpine convergence record in the Carboniferous Badstub Formation, Upper Austroalpine basement nappes, Austria.
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              Text: Jan2024
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