Results 161 to 170 of about 4,105 (193)
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Late Variscan Magmatic Evolution of the Alpine Basement
1993After having experienced the Variscan orogenic episodes, the pre-Mesozoic Alpine basement was subjected to large-scale shearing effects accompanying lithosphere distensional thinning, “Basin and Range”-like tectonics and high geothermal regimes. As a result of intrusion of mantle-derived magmas and induced crustal anatexis, almost all pieces of ...
BONIN B +16 more
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2022
The Variscan post-collisional tectonic and magmatic events were critical for ore deposits in the Paleozoic massifs of Europe. In Sardinia, two main types of Variscan ore deposits can be recognized: (1) “orogenic”, structurally-controlled deposits associated with shear zones and extensional structures; (2) granite intrusion hosted/related deposits. Both
Naitza S. +7 more
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The Variscan post-collisional tectonic and magmatic events were critical for ore deposits in the Paleozoic massifs of Europe. In Sardinia, two main types of Variscan ore deposits can be recognized: (1) “orogenic”, structurally-controlled deposits associated with shear zones and extensional structures; (2) granite intrusion hosted/related deposits. Both
Naitza S. +7 more
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International Journal of Earth Sciences, 2009
Mafic and intermediate intrusions occur in the Slavkovský les as dykes, sills and minor tabular bodies emplaced in metamorphic rocks or enclosed in late Variscan granites near the SW contact of the Western Krusne hory/Erzgebirge granite pluton. They are similar in composition and textures to the redwitzites defined in NE Bavaria.
Pavla Kováříková +6 more
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Mafic and intermediate intrusions occur in the Slavkovský les as dykes, sills and minor tabular bodies emplaced in metamorphic rocks or enclosed in late Variscan granites near the SW contact of the Western Krusne hory/Erzgebirge granite pluton. They are similar in composition and textures to the redwitzites defined in NE Bavaria.
Pavla Kováříková +6 more
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Tectonophysics, 1994
Abstract We obtained Sr-Nd isotope and trace-element data on late Variscan volcanic rocks in the Pyrenees: felsic lavas and andesites from the Ossau and the Serra de Cadi massifs and calc-alkaline andesites and alkali basalts from the La Rhune and the Anayet volcanic massifs.
Christophe Innocent +2 more
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Abstract We obtained Sr-Nd isotope and trace-element data on late Variscan volcanic rocks in the Pyrenees: felsic lavas and andesites from the Ossau and the Serra de Cadi massifs and calc-alkaline andesites and alkali basalts from the La Rhune and the Anayet volcanic massifs.
Christophe Innocent +2 more
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International Journal of Earth Sciences, 2003
Pb-evaporation zircon analyses coupled with a detailed cathodoluminescence (CL) study on the complete series of granitoids from the northern Oberpfalz, NE Bavaria, provide new evidence for the commencement and timing of late-Variscan magmatism. All granitoids analysed in this study were dated before by Rb–Sr and/or K–Ar methods.
W. Siebel, F. Chen, M. Satir
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Pb-evaporation zircon analyses coupled with a detailed cathodoluminescence (CL) study on the complete series of granitoids from the northern Oberpfalz, NE Bavaria, provide new evidence for the commencement and timing of late-Variscan magmatism. All granitoids analysed in this study were dated before by Rb–Sr and/or K–Ar methods.
W. Siebel, F. Chen, M. Satir
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Geological Society, London, Special Publications, 2004
Abstract Permian magmatism in the Pyrenees is characterized by two compositionally different and temporally consecutive magmatic episodes: a calc-alkaline-transitional phase (andesites) and a midly alkaline phase (basalts and dolerites). These two magmatic episodes were related to the attenuation of late Variscan transtensional tectonics and ...
M. Lago +4 more
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Abstract Permian magmatism in the Pyrenees is characterized by two compositionally different and temporally consecutive magmatic episodes: a calc-alkaline-transitional phase (andesites) and a midly alkaline phase (basalts and dolerites). These two magmatic episodes were related to the attenuation of late Variscan transtensional tectonics and ...
M. Lago +4 more
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Geological Magazine, 2009
AbstractThe large Variscan Karkonosze Granite in the West Sudetes, representative of the vast Variscan granite plutonism in Central Europe and located adjacent to regional tectonic suture and strike-slip-zones, has been difficult to date precisely; a range of published data varies betweenc.304 and 328 Ma. However, the granite is cut by locally numerous
MAREK AWDANKIEWICZ +3 more
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AbstractThe large Variscan Karkonosze Granite in the West Sudetes, representative of the vast Variscan granite plutonism in Central Europe and located adjacent to regional tectonic suture and strike-slip-zones, has been difficult to date precisely; a range of published data varies betweenc.304 and 328 Ma. However, the granite is cut by locally numerous
MAREK AWDANKIEWICZ +3 more
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2023
The external zone of the Variscan chain in southern Sardinia hosts several short-lived, both composite, and homogeneous plutons emplaced at shallow crustal levels during post-collisional extension. Except for Arbus composite pluton, dated 304 ± 3 Ma, the emplacement ages cluster within a narrow time interval between about 289 ± 1 and 285 ± 1 Ma ...
Leonardo Casini +7 more
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The external zone of the Variscan chain in southern Sardinia hosts several short-lived, both composite, and homogeneous plutons emplaced at shallow crustal levels during post-collisional extension. Except for Arbus composite pluton, dated 304 ± 3 Ma, the emplacement ages cluster within a narrow time interval between about 289 ± 1 and 285 ± 1 Ma ...
Leonardo Casini +7 more
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THE LATE VARISCAN FERROAN GRANITE MAGMATISM OF SOUTHERN SARDINIA: INFERENCES FROM Mo METALLOGENESIS
2017Metallogeny is a powerful tool to investigate crustal evolution; a good example is offered by the Variscan basement of Sardinia and its Mo deposits. Mo ores are poorly represented in Variscan metallogenic provinces of Europe: however, in Sardinia, numerous small Mo deposits, often associated to Sn, W and F ores, are present, invariably related to an ...
Naitza Stefano +6 more
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2015
The late Variscan post-collisional events in Sardinia generate two main types of ore deposits: (1) intrusion hosted/related deposits; (2) "orogenic", structurally-controlled deposits associated with shear zones. The former include Pb-Zn (Ag, Cu), Ni-Co-As-Bi and F-Pb veins, W and Sn veins, Mo greisens, Pb-Zn-Cu skarns; the latter are characterised by ...
Naitza, Stefano +6 more
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The late Variscan post-collisional events in Sardinia generate two main types of ore deposits: (1) intrusion hosted/related deposits; (2) "orogenic", structurally-controlled deposits associated with shear zones. The former include Pb-Zn (Ag, Cu), Ni-Co-As-Bi and F-Pb veins, W and Sn veins, Mo greisens, Pb-Zn-Cu skarns; the latter are characterised by ...
Naitza, Stefano +6 more
openaire +2 more sources