Results 181 to 190 of about 7,254 (226)

The Variscan structural and metamorphic evolution of the eastern Southalpine basement

Journal of the Geological Society, 1994
The basement of the Southern Alps (northern Italy) belongs to the southernmost part of the European Variscan mountain belt. In contrast to other areas of the Alps, the post-Variscan metamorphic and tectonic overprint is weak and therefore permits the unravelling of the Variscan tectonometamorphic evolution of this region.
U. RING, C. RICHTER
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Thin-skinned tectonics, basement control and the Variscan front

Geological Society, London, Special Publications, 1984
Summary The thin-skinned interpretation of Variscan structures in southern England, Wales and Ireland, based on structural and seismic evidence, is used to define the Variscan front as the northern limit of the thin-skinned structures. The original front was where displacement on the décollement surface diminished to zero.
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Variscan Basement of the Western Alps: the External Crystalline Massifs

1994
In the western part of the Alps, the basement relicts occur in the Helvetic (Alpine external zone or Dauphine zone) and Penninic (Briancon and Piemont zones) domains, which correspond respectively to the External and Internal Crystalline Massifs (ECMs and ICMs).
R.-P. Ménot, J. F. von Raumer, S. Bogdanoff, G. Vivier   +3 more
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Geochemical signatures of gold-bearing shear zones in the Variscan basement, France

Journal of Geochemical Exploration, 1989
Abstract The geochemical signature of Au mineralization is a function of its sulphide parageneses and associated wall-rock alteration. This signature can be used to classify a prospect as a function of the anomalies it causes (in rocks or, if conditions are favourable, in soil) in a given geologic environment.
M. Bonnemaison, D. Bonnefoy, C. Braux
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The External Massifs, relics of Variscan basement in the Alps

Geologische Rundschau, 1984
Chemical and structural data give new insight into the complex metamorphic evolution of crystalline basement of the Helvetic Realm (Central and Western Alps). The relics of pre-Carboniferous basement — the so called External Massifs — may be subdivided into an older basement unit with a younger cover, which together suffered the following metamorphic ...
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Carboniferous tectonics of the Variscan basement collage in eastern Bavaria and western Bohemia

Geologische Rundschau, 1997
The tectonometamorphic units in the Variscan basement of eastern Bavaria and western Bohemia have a long and complex record of large-scale continental deformation, metamorphism, and syn- and posttectonic magmatism. Although there is a large database describing each of the above-mentioned phenomena, an integrated tectonic synthesis is hard to achieve ...
Behrmann, Jan H., Tanner, David Colin
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Understanding the pre-Variscan and Variscan basement components of the central Tauern Window, Eastern Alps (Austria): constraints from single zircon U-Pb geochronology

International Journal of Earth Sciences, 2005
New single-grain and within-grain U-Pb zircon ages from the central Tauern Window help sorting out the time dimension among the various Variscan and pre-Variscan basement components that were strongly overprinted by Alpine orogeny. Single-grain isotope dilution (ID-TIMS) U-Pb zircon geochronology of three Basisamphibolit samples yield protolith ...
Kebede, Tesfaye, Kloetzli, Urs, Kosler, Jan, Skiöld, Torbjörn   +3 more
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Persistent basement wrenching as controlling mechanism of Variscan thin-skinned thrusting and sedimentation, Cantabrian Mountains Spain

Tectonophysics, 1989
In this classical area of thin-skinned tectonics current models of the complex fold and thrust belt seem to be approaching a successful synthesis without the necessity for extreme regional bending to account for the characteristic horse-shoe form of the orogen. Fundamental wrench fault zones (e.g., the León and Sabero-Gordón lineaments) whose influence
Nijman, W., Savage, J. F.
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Evolution of Austro-Alpine and Upper Penninic Basement in the Northwestern Alps from Variscan Convergence to Post-Variscan Extension

1993
The oldest protoliths of the Austro-Alpine nappe system from the Western Alps consist of the intimate association of metapelites, tholeiitic metabasites and marbles which closely recalls the lithology and metamorphic evolution of the lower crustal section of the South-Alpine Ivrea-Verbano kinzigitic complex.
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Late Paleozoic extension in the Variscan basement of SE Sardinia (Italy)

1995
Abstract a congresso, 1995; supplemento a Terra ...
Conti, P., Carmignani, L., Benedetti, M., Cherchi, G., Chighine, G., Cincotti, F., Eltrudis, A., Funedda, A., Gattiglio, M., Oggiano, G., Patta, D., Sarria, E.   +11 more
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