Polyphase metamorphism in the eastern Carnic Alps (N Italy–S Austria): clay minerals and conodont Colour Alteration Index evidence

Brime, Covadonga; Perri, Maria Cristina; Pondrelli, M.; Spalletta, Claudia; Venturini, Corrado

doi:10.1007/s00531-007-0218-7

Cited by 28 publications

(31 citation statements)

References 39 publications

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“…The different kinetics of the illitization and the carbonization processes, the former being less sensitive to the time spent at a certain temperature (Hillier et al. , 1995; Brime et al. , 2001, 2003, 2007; Arkai et al.…”

Section: Tectonothermal Evolutionmentioning

confidence: 99%

Tectonothermal evolution of a foreland fold and thrust belt: the Cantabrian Zone (Iberian Variscan belt, NW Spain)

et al. 2007

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Analysis of the conodont colour alteration index and the Kübler index of illite allowed us the characterization of four types of very low‐ or low‐grade metamorphism in the Cantabrian Zone (CZ) and determination of their regional and temporal distribution. These types are: (1) an orogenic Variscan metamorphism present only in restricted areas of the western and north‐western parts of the CZ where epizonal conditions are reached; (2) a burial metamorphism that appears in the basal part of some nappes, where anchizonal conditions are sometimes achieved; the thermal peak preceded emplacement of the nappes; (3) a late‐Variscan metamorphism in the southern and south‐eastern parts of the CZ; a cleavage, cutting most of the Variscan folds, is associated with this metamorphism, which has been related to an extensional episode; (4) a contact metamorphism and hydrothermal activity associated with minor intrusive bodies. The extension continued after the Variscan deformation giving rise to hydrothermal activity during Permian times.

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Section: Tectonothermal Evolutionmentioning

confidence: 99%

Tectonothermal evolution of a foreland fold and thrust belt: the Cantabrian Zone (Iberian Variscan belt, NW Spain)

et al. 2007

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“…This sequence was affected by the Variscan orogeny during the late Bashkirian and early Moscovian (Schönlaub 1980, Venturini 1990, Schönlaub & Forke 2007 and by extensional as well as compressional and transpressional Alpine phases (Venturini 1990, Läufer 1996, which formed a fold and thrust belt. Despite the severe deformation, the succession is mostly non-metamorphic (Brime et al 2008).…”

Section: Geological Settingsmentioning

confidence: 99%

Lower Lochkovian (Lower Devonian) conodonts from Cellon section (Carnic Alps, Austria)

Corriga¹,

Corradini²,

Schonlaub³

et al. 2016

Bull. Geosci.

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The conodont stratigraphy of the lower Lochkovian part of the famous Cellon section is presented. The association includes twenty-two taxa belonging to nine genera, and allows discriminating the two biozones of the lower Lochkovian (Icr. hesperius and Icr. postwoschmidti zones). Three taxa (Zieglerodina formosa, Z. mashkovae and Z. prosoplatys) are reported for the first time from the Carnic Alps, and other two species of Zieglerodina, probably new, are described in open nomenclature.•

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“…Both orogenies resulted in the formation of several thrust sheets, imbricate nappe systems, and dislocations. The Variscan orogeny is interpreted as formed at considerable crustal depth, which leads to more ductile deformations, including recumbent folding (Venturini 1990;Brime et al 2008). The resultant structural setting has been sketched by Läufer et al (2001) who defined four major tectonic units (Fig.…”

Section: Location and Geological Contextmentioning

confidence: 99%

“…According to Austrian authors (Piller et al 2004), a summary of the Devonian stratigraphy of the Cellon-Kellerwand Nappe with the location of the Freikofel section is (Piller et al 2004). Modifications are made for the Freikofel Limestone according to its age and relation with the cellon limestone (red dotted line) based on the age range mentioned in Brime et al (2008), on the geological map of Venturini et al (2009), and the new conodont data obtained for this study Int J Earth Sci (Geol Rundsch) illustrated in the Fig. 3.…”

Section: Location and Geological Contextmentioning

confidence: 99%

Insight into the development of a carbonate platform through a multi-disciplinary approach: a case study from the Upper Devonian slope deposits of Mount Freikofel (Carnic Alps, Austria/Italy)

Pas

Silva

Suttner

et al. 2013

Int J Earth Sci (Geol Rundsch)

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The development and behavior of million yearscaled depositional sequences recorded within Palaeozoic carbonate platform has remained poorly examined. Therefore, the understanding of palaeoenvironmental changes that occur in geological past is still limited. We herein undertake a multi-disciplinary approach (sedimentology, conodont biostratigraphy, magnetic susceptibility (MS), and geochemistry) of a long-term succession in the Carnic Alps, which offers new insights into the peculiar evolution of one of the best example of Palaeozoic carbonate platform in Europe. The Freikofel section, located in the central part of the Carnic Alps, represents an outstanding succession in a fore-reef setting, extending from the Latest Givetian (indet. falsiovalis conodont zones) to the Early Famennian (Lower crepida conodont zone). Sedimentological analysis allowed to propose a sedimentary model dominated by distal slope and fore-reef-slope deposits. The most distal setting is characterized by an autochthonous pelagic sedimentation showing local occurrence of thin-bedded turbiditic deposits. In the fore-reef slope, in a more proximal setting, there is an accumulation of various autochthonous and allochthonous fine-to coarse-grained sediments originated from the interplay of gravity-flow currents derived from the shallow-water and deepwater area. The temporal evolution of microfacies in the Freikofel section evolves in two main steps corresponding to the Freikofel (Unit 1) and the Pal (Unit 2) limestones. Distal slope to fore-reef lithologies and associate changes are from base to top of the section: (U1) thick bedded litho-and bioclastic breccia beds with local fining upward sequence and fine-grained mudstone intercalations corresponding, in the fore-reef setting, to the dismantlement of the Eifelian-Frasnian carbonate platform during the Early to Late Frasnian time (falsiovalis to rhenana superzones) with one of the causes being the Late Givetian major rift pulse; (U2) occurrence of thinbedded red nodular and cephalopod-bearing limestones with local lithoclastic grainstone intercalations corresponding to a significant deepening of the area and the progressive withdrawal of sedimentary influxes toward the basin, in relation with Late Frasnian sea-level rise. MS and geochemical analyses were also performed along the Freikofel section and demonstrate the inherent parallel link existing between variation in MS values and proxy for terrestrial input. Interpretation of MS in terms of palaeoenvironmental processes reflects that even though distality

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Polyphase metamorphism in the eastern Carnic Alps (N Italy–S Austria): clay minerals and conodont Colour Alteration Index evidence

Cited by 28 publications

References 39 publications

Tectonothermal evolution of a foreland fold and thrust belt: the Cantabrian Zone (Iberian Variscan belt, NW Spain)

Tectonothermal evolution of a foreland fold and thrust belt: the Cantabrian Zone (Iberian Variscan belt, NW Spain)

Lower Lochkovian (Lower Devonian) conodonts from Cellon section (Carnic Alps, Austria)

Insight into the development of a carbonate platform through a multi-disciplinary approach: a case study from the Upper Devonian slope deposits of Mount Freikofel (Carnic Alps, Austria/Italy)

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