Variscan Orogeny
THE IBERIAN VARISCAN OROGEN
... The Variscan orogen forms the basement of the Iberian Peninsula and of most of western and central ...The Variscan orogeny is the name given to the whole set of geological processes which deeply ...
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Oligo-Miocene thinning of the Beni Bousera peridotites and their Variscan crustal host rocks, Internal Rif, Morocco
... The Betic-Rif orogen is a typical example of such complex relationships. This orogenic belt resulted from the closure of the westernmost part of the Tethys Ocean between Africa and the Iberian Peninsula during the ...
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Insights on high-grade deformation in quartzo-feldspathic gneisses during the early Variscan exhumation of the Cabo Ortegal nappe, NW Iberia
... The available ages at peak metamorphic conditions and at mid-crustal depths provide time constraints for the ex- humation process, which might involve at least 140 km of horizontal displacement onto the continental ...
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Provenance constraints from detrital zircon U Pb ages in the NW Iberian Massif: implications for Palaeozoic plate configuration and Variscan evolution
... Granitoids are abundant in the Iberian Massif (Fig. 2), and result from melting of the continental crust thickened during the Variscan orogeny. Capdevila (1969), Capdevila & Floor (1970) and Capdevila ...
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The Hospitalet gneiss dome (Pyrenees) revisited: lateral flow during Variscan transpression in the middle crust
... The Pyrenees afford several exam- ples of gneiss domes that developed in the middle crust (Fig. 1a) during the late Variscan orogeny (320–300 Ma). They form the ÔinfrastructureÕ (Zwart, 1979) around which a ...
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INTERNAL STRUCTURE AND GEOCHRONOLOGY OF THE GERREI UNIT IN THE FLUMENDOSA AREA, VARISCAN EXTERNAL NAPPE ZONE, SARDINIA, ITALY
... the Variscan Orogeny which, under some reconstructions, is thought to be related to the tightening of the Ibero-Armorican arc by west-directed thrusting of the Cantabrian indentor (Elter, Musumeci, and ...
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Schätz, Michael (2004): Palaeozoic Geography and Palaeomagnetism of the Central European Variscan and Alpine Fold Belts. Dissertation, LMU München: Fakultät für Geowissenschaften
... a Variscan flysch sequence [Spalletta and Venturini, ...the Variscan orogeny reached the climax between the Late Namurian and Late Westphalian stages as a result of collision and consolidation with ...
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Devonian rift-related sedimentation and Variscan tectonics – new data on the Looe and Gramscatho basins from the resurvey of the Newquay District
... Structural evolution during the Variscan orogeny was polyphase and spatially complex. All sedimentary rocks in the district experienced D 1 regional ductile deformation, which formed isoclinal folds and ...
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Variscan to Neogene long-term landscape evolution at the Moroccan passive continental margin (Tarfaya Basin and western Anti-Atlas)
... The present study introduces the first comprehensive thermochronological research at the south- ern Moroccan passive continental margin. The established low-temperature thermochronological methods apatite and zircon ...
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Origin and duration of late orogenic magmatism in the foreland of the Variscan belt (Lesponne — Chiroulet — Neouvielle area, french Pyrenees)
... the Variscan orogeny, the pyrenean segment underwent intense magmatism and regional high temperature – low pressure ...Late Variscan metamorphism and magmatism recorded in the Pyrenees have to be ...
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Pre-Variscan tectonic setting of the south margin of Armorica: Insights from detrital zircon ages distribution and Hf isotopic composition of the St-Georges-sur-Loire Unit (S. Armorican Massif, France)
... A main Ediacaran peak, between 625 Ma and 595 Ma, is prominently marked in most samples (Figs. 7 and 11A), indicating that the provenance of the S t -Georges-sur-Loire Unit material may be from a Neoproterozoic basement, ...
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The floristic relationship between the upland and lowland Carboniferous wetlands of Variscan Euramerica — Evidence from some medullosalean pteridosperm fronds
... wetland basins of Variscan Euramerica in early Bolsovian times, and only migrated into the lowland wetlands in middle Asturian times, some 4 million years later. An explanation for this migration will require ...
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Chemical abrasion applied to SHRIMP zircon geochronology: An example from the Variscan Karkonosze Granite (Sudetes, SW Poland)
... Due to the fact that the limit on precision of 206Pb/238U SIMS data for zircon from the Karkonosze Granite in this study is in the order of 2 %, it is likely that only extreme difference[r] ...
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Mantle lithosphere transition from the East European Craton to the Variscan Bohemian Massif imaged by shear-wave splitting
... Regional variations of the splitting parameters, as well as their back-azimuth dependences, occur also eastward of the TESZ, but groups of stations with similar anisotropic pa- rameters are less coherent than those in ...
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High-frequency tectonic sequences in the Campanian Castlegate Formation during a transition from the Sevier to Laramide orogeny, Utah, U.S.A.
... Clues useful to understanding the timing and style of orogenesis can be found within a foreland basin-fill (Miall and Arush, 2001; Ettensohn, 2004; Aschoff and Steel, 2011). Foreland stratigraphic architecture can ...
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Non-cylindrical parasitic folding and strain partitioning during the Pan-African Lufilian orogeny in the Chambishi–Nkana Basin, Central African Copperbelt
... Lufilian orogeny at Nkana was mainly via fold- ing on multiple scales, with relatively little accommodation of deformation via ...Lufilian orogeny (Coward and Daly, 1984; Daly et ...
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Zircon U-PB and LU-HF isotopic data from some peri-gondwana variscan terranes (Sardinia-Corsica block and calabropeloritan arc): new insights on the cenozoic geodynamic evolution of the central mediterranean basin
... Here will be discuss the results obtained for the Tertiary deposits cropping out in Sardinia, Corsica, Northern part of CPA (Sila sub-region) and Southern part of CPA (Aspromonte sub-region). We consider these like ...
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The new critical metals database “HTMET”: High tech trace element characteristics of sulphides from base metal provinces in the variscan basement and adjacent sedimentary rocks in Germany
... Despite the well-known high natural variability in the distribution of trace elements in natural samples, it can be deduced from the data that sphalerite from all hydrothermal vein de[r] ...
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Animal evolution and atmospheric pO2: is there a link between gradual animal adaptation to terrain elevation due to Ural orogeny and survival of subsequent hypoxic periods?
... Hunter-Bowen orogeny started in Permian was in that period far south from the ...This orogeny started from 318 Mya, in the late Carbon- iferous, and lasted to 251 Mya at the P-Tr ...
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Tectonothermal evolution in the core of an arcuate fold and thrust belt: the south-eastern sector of the Cantabrian Zone (Variscan belt, north-western Spain)
... Temperature ranges of the CAI values were obtained from the Arrhenius plot presented by Epstein et al. (1977) and Rejebian et al. (1987). The maximum possible heating time is the age of the rock. Nevertheless, it is ...
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