Results 181 to 190 of about 6,109 (226)

Variscan orogeny in the Black Sea region

International Journal of Earth Sciences, 2016
Two Gondwana-derived Paleozoic belts rim the Archean/Paleoproterozoic nucleus of the East European Platform in the Black Sea region. In the north is a belt of Paleozoic passive-margin-type sedimentary rocks, which extends from Moesia to the Istanbul Zone and to parts of the Scythian Platform (the MOIS Block).
Aral I. Okay, Gültekin Topuz
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Colliding cratons: linking the Variscan Orogeny in West Africa and North America

Geological Society, London, Special Publications, 2023
Abstract The Variscan Orogen was formed during the closure of the Rheic Ocean and the final collision between the North American and West African cratons in the Late Paleozoic. This collision led to the multistage building of the Mauritanide Belt to the east of the Variscan suture and to the building of the well-known Appalachian
Michel Villeneuve, Andreas Gärtner, Paul A. Mueller, Omar Guillou, Ulf Linnemann   +4 more
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Magnetic fabrics in Portuguese Variscan granites: structural markers of the Variscan orogeny

2020
<p>This work focuses on the magnetic fabric of 20 variscan granitic massifs from northern and central Portugal and considers the Anisotropy of Magnetic Susceptibility (AMS) results obtained in about 750 sampling sites. In the northern and central Portugal, three main ductile deformation phases were recognized and described: D&
Helena Sant Ovaia, Ana Gonçalves, Claudia Cruz, Fernando Noronha   +3 more
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The age of the paroxysmal Variscan orogeny in England

Geological Society, London, Special Publications, 1964
Summary Potassium–argon age-determinations on 10 basic igneous rocks from the English Midlands indicate two distinct episodes of magmatic intrusion. Geological evidence and Permo-Carboniferous isotopic age data from Britain confirm the well-known close relationship between magmatism and earth-movements.
Frank Joseph Fitch, John Alfred Miller
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The Variscan orogeny in Chios (Greece): Carboniferous accretion along a Palaeotethyan active margin

Terra Nova, 2003
ABSTRACT New stratigraphic and structural data on the turbiditic succession of Chios (Volissos turbidites) suggest that this clastic wedge formed during the Early Carboniferous. These turbidites, fed long‐distance by erosion of the Variscan orogen, were most likely deposited in a Palaeotethyan remnant‐ocean basin.
ZANCHI, ANDREA MARCO, GARZANTI, EDUARDO, Larghi, C, Angiolini, L, Gaetani, M.   +4 more
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Variscan orogeny: a three ocean problem

Variscan orogenic evolution was dominated by closure of the Rheic Ocean and its two successors, the Rhenohercynian and Paleotethys oceans. The Rheic subduction started in late Silurian – early Devonian at the margin of Laurussia but also along two Gondwana derived continental ribbons. Rapid mid-Devonian roll-back of peri-Laurentian subduction
Karel Schulmann, José Ramón Martínez Catalán, Urs Schaltegger   +2 more
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Appalachians in the Time Interval between the Grenville Orogeny and Variscan Collision

1999
Both in the southern and northern Appalachians, inliers of Grenville rocks are surrounded and overthrust by Phanerozoic and Neoproterozoic rocks.
N. Rast, J. W. Skehan
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Isotope geochemistry evidence for Laurussian-type sources of South Portuguese Zone Carboniferous turbidites (Variscan Orogeny)

Geological Society, London, Special Publications, 2020
Abstract New Rb–Sr isotopic data from South Portuguese Zone (SPZ) turbidites show that the 87 Sr/ 86 Sr( t ) ratio increases from the basal Mértola Formation (Visean–Serpukhovian: 0.706–0.707), through the Mira Formation (Serpukhovian–Bashkirian: 0.706–0.712)
Manuel Francisco Pereira, Cristina Gama, Ícaro Dias da Silva, José Manuel Fuenlabrada, José Brandão Silva, Jorge Medina   +5 more
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Detrital zircons and the interpretation of palaeogeography, with the Variscan Orogeny as an example

Geological Magazine, 2019
AbstractAnalysis of the distribution of detrital zircon grains is one of the few parameters by which Precambrian palaeogeography may be interpreted. However, the break-up of Pangea and the subsequent dispersal of some of its fragments around the Indian Ocean demonstrate that zircon analysis alone may be misleading, since zircons indicate their original
W. Franke, L.R.M. Cocks, T.H. Torsvik
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Mobilization of tin during metamorphism in the Variscan Orogeny

The Erzgebirge, a major tin (Sn) province in the Variscan orogenic belt, hosts substantial Sn deposits associated with post-kinematic granites, alongside the minor stratabound Sn deposits found in the metamorphic schists of the western Erzgebirge. These schists are derived from Early Ordovician siliciclastic sediments, which were metamorphosed during ...
Owishi Sarkar, Rolf L. Romer, Uwe Kroner, Claus Legler   +3 more
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