Geologische Beobachtungen in den italienischen Teilen des Albigna-Disgraziamassivs

Cornelius, Heinrich

doi:10.1007/bf01797476

Cited by 6 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main body of the Bergell pluton is nearly concentrically zoned, with tonalite at the rim, granodiorite in the core, and a transitional zone in between [ Moticska , 1970]. Post‐intrusive tilting and erosion of the Bergell resulted in the present‐day exposure of a 12 km deep crustal section between the eastern and western ends of the pluton (Figures 4a and 4b), as supported by the following observations: All structures plunge to the east [ Cornelius , 1915; Staub , 1918; Trommsdorff and Nievergelt , 1983; Rosenberg et al , 1995; Schmid et al , 1996b]; petrologic data indicate a westward, post‐intrusive pressure increase of 3–4 kbar [ Reusser , 1987; Davidson et al , 1996] and a westward temperature increase [ Rosenberg and Stünitz , 2003]; geochronologic data show progressively younger ages from east to west [ Villa and von Blanckenburg , 1991], and finally, paleomagnetic data, suggest west‐side‐up tilting around a N‐S striking axis [ Rosenberg and Heller , 1997]. Moreover, 3 km of relief through the pluton, allow the reconstruction of the three‐dimensional shape of the intrusive body (Figure 4b).…”

Section: Geometry Ascent and Emplacement Of The Largest Periadriatimentioning

confidence: 78%

Shear zones and magma ascent: A model based on a review of the Tertiary magmatism in the Alps

2004

View full text Add to dashboard Cite

The Alpine Oligocene plutons are spatially and temporally associated with the activity of the Periadriatic Fault System (PFS), an orogen‐parallel, crustal‐scale transpressive mylonitic belt. Excellent three‐dimensional exposure, combined with a wealth of structural, seismic, petrological, geochronological, geochemical, and paleomagnetic data collected over the last decades help to constrain the relationships between deformation, ascent, and emplacement of the plutons. Magmas were channeled from the base of the thickened continental crust into the narrow mylonitic belt of the Periadriatic Fault System, which was used as ascent pathway to cover vertical lengths of 20 to 40 km. Therefore the linear alignment of the plutons at the surface is not the expression of a linear source region at depth. Ascent of the melts is controlled by the mylonitic foliation of the PFS, which forms the only steep anisotropy, continuously traversing the entire Alpine crust. In contrast, the flow direction is not influenced by the specific kinematics of the faults. Final emplacement of the plutons occurred by extrusion from the Periadriatic Fault System into the adjacent country rocks. The transition from ascent to final emplacement is favored by partitioning of transpressive deformation.

show abstract

Section: Geometry Ascent and Emplacement Of The Largest Periadriatimentioning

confidence: 78%

Shear zones and magma ascent: A model based on a review of the Tertiary magmatism in the Alps

2004

View full text Add to dashboard Cite

show abstract

“…In marbles from the eastern Bergell contact aureole (Switzerland/Italy) humite minerals were first mentioned by Cornelius (1915). Later, Deverin (1937), Wenk (1963), Trommsdorff (1966), BucherNurminen (1976BucherNurminen ( , 1977 and Giere (1984) described parageneses with forsterite, spinel, tremolite, chlorite, phlogopite, dolomite and calcite.…”

Section: Introductionmentioning

confidence: 99%

Titanian clinohumite and geikielite in marbles from the Bergell contact aureole

Gieré¹

1987

Contr. Mineral. and Petrol.

View full text Add to dashboard Cite

Abstract. The assemblage titanian clinohumite + forsterite + spinet + calcite is widespread in marbles from the eastern Bergell contact aureole (Switzerland/Italy). The Bergell titanian clinohumites vary considerably in composition (Ti0 2 : 0.19 to 2.05 wt%, F: 2.2 to 3.4 wt%). Electron microprobe analyses show that the titanian clinohumites contam less than detectable amounts of Co, Cu, Ni, Zn, Al, Cr and CI. No trace of ferric iron could be detected by Moessbauer spectroscopy. Moreover, the Moessbauer spectra indicate that Fe 2 + occurs only in one of the five octahedral positions in the crystal structure of the studied titanian clinohumite. Under the conditions of the contact metamorphism (600 650° C, 3 kb total pressure) the compositional variation along the exchange vector TiO 2 M 1 (OH,F) 2 takes place at constant x 0 , 1 which is fixed by the pore fluid. Titanian clinohumite sometimes contains geikielite inclusions which strongly fractionate Fe and Mn relative to titanian clinohumite. The geikielites from the Bergell marbles are poor in Cr 2 0 3 , Fe 2 0 3 and MnO, and thus different from those found in carbonatites, kimberlites and serpentinized ultramafic rocks.

show abstract

“…The Blasseneck Porphyroid of the Veitsch area consists mainly of crystal-rich meta-ignimbrites of dacitic composition (Heinisch, 1980). Frequent intercalations of fine-grained siliciclastic rocks as depicted by Cornelius (1936) cannot be confirmed. The two-phase low-grade metamorphism has wiped out most volcanic textures, transformed the original glassy matrix into fine-grained secondary minerals like sericite, chlorite, quartz, albite and kaolinite (Heinisch, 1980) and affected also the phenocrysts (sericitization of feldspar, plastic deformation and dynamic recrystallisation of quartz, dissociation of biotite).…”

Section: Blasseneck Porphyroid (Early To Late Ordovician)mentioning

confidence: 93%

“…The name of this formation is derived from "Wirtshaus Rad" (Cornelius, 1936(Cornelius, , 1952, i.e. Rudolf Lammer´s inn "zum Radwirt" (15.439E; 47.621N), demolished in the late 1930s.…”

Section: Rad Formation (Late Ordovician To Silurian)mentioning

confidence: 99%

“…The existence of Variscan internal nappes or "Schuppen" in the Noric Nappe has been taken for granted since the first detailed mapping of the study area 1936, 1952. Variscan nappes have also been described from other well-studied areas of the Greywacke Zone like the Eisenerz Mountains (e.g., Schönlaub, 1982) and Kitzbühel (e.g., Heinisch et al, 2015).…”

Section: Tectonic Structure Of the Noric Nappementioning

confidence: 99%

See 1 more Smart Citation

From shallow into deep sea: Sedimentary facies and U-Pb zircon ages in the early Paleozoic Noric Group at Veitsch (Eastern Greywacke Zone, Austria)

Nievoll,

Fritz,

Gallhofer

et al. 2022

Austrian Journal of Earth Sciences

View full text Add to dashboard Cite

The low-grade metamorphic early Paleozoic basement of the Veitsch area presents a wide variety of sedimentary facies domains. The first domain consists of thick metadacites of Middle Ordovician age (Blasseneck Porphyroid), overlain by fine-grained metaclastics of the Rad Formation (Late Ordovician to Silurian) and Devonian limestones and calcitic marbles (Kaiserstein and Kaskögerl Formation, respectively). Rhyolitic to dacitic magmatism initiated at ca. 479 Ma (LAMC-ICP-MS U-Pb zircon data) and lasted until ca. 444 Ma. The second domain comprises metaclastics of the Stocker Formation (Early Ordovician to Silurian), characterized by thin volcanics and volcaniclastics of andesitic and rhyolitic composition. U-Pb zircon data give Middle Ordovician age (463 Ma – 468 Ma). The third domain, exposed northwest of Veitsch, consists of thick metadacites (Blasseneck Porphyroid, ca. 478 Ma), followed by (siliceous) phyllites which grade into turbiditic metasediments (Sommerauer Formation, Late Ordovician to Devonian?). Clastic sediments of the Stocker and Sommerauer Formations were sourced from northern Gondwana showing a prominent Pan-African detrital zircon peak at ca. 640 Ma. Middle to Upper Ordovician volcanics (ca. 462 Ma – 448 Ma) represent the second source. Tectonic reconstruction leads us to the arrangement of three facies domains. A shallow marine shelf facies is located in the present days southwest. A marginal basin with volcanic islands on a sloping continent, and a deep-water environment containing turbidites are situated further to the northwest. The present arrangement of these facies domains is explained by eo-Alpine and Variscan thrust tectonics.

show abstract

Geologische Beobachtungen in den italienischen Teilen des Albigna-Disgraziamassivs

Cited by 6 publications

References 0 publications

Shear zones and magma ascent: A model based on a review of the Tertiary magmatism in the Alps

Shear zones and magma ascent: A model based on a review of the Tertiary magmatism in the Alps

Titanian clinohumite and geikielite in marbles from the Bergell contact aureole

From shallow into deep sea: Sedimentary facies and U-Pb zircon ages in the early Paleozoic Noric Group at Veitsch (Eastern Greywacke Zone, Austria)

Contact Info

Product

Resources

About