Results 121 to 130 of about 171 (156)
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Canadian Journal of Earth Sciences, 2000
The igneous protoliths of the Margaree orthogneiss intruded the peri-Gondwanan rocks of the Port-aux-Basques Complex, in the southwestern corner of the Hermitage Flexure, prior to regional deformation and metamorphism. Field relationships and UPb geochronology indicate that the Margaree orthogneiss represents a 20 km long, mafic-felsic intrusive ...
Pablo Valverde-Vaquero +2 more
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The igneous protoliths of the Margaree orthogneiss intruded the peri-Gondwanan rocks of the Port-aux-Basques Complex, in the southwestern corner of the Hermitage Flexure, prior to regional deformation and metamorphism. Field relationships and UPb geochronology indicate that the Margaree orthogneiss represents a 20 km long, mafic-felsic intrusive ...
Pablo Valverde-Vaquero +2 more
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International Journal of Earth Sciences, 2004
Neoproterozoic tectonics is dominated by the amalgamation of the supercontinent Rodinia at ca. 1.0 Ga, its breakup at ca. 0.75 Ga, and the collision between East and West Gondwana between 0.6 and 0.5 Ga. The principal stages in this evolution are recorded by terranes along the northern margin of West Gondwana (Amazonia and West Africa), which ...
J. Brendan Murphy +3 more
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Neoproterozoic tectonics is dominated by the amalgamation of the supercontinent Rodinia at ca. 1.0 Ga, its breakup at ca. 0.75 Ga, and the collision between East and West Gondwana between 0.6 and 0.5 Ga. The principal stages in this evolution are recorded by terranes along the northern margin of West Gondwana (Amazonia and West Africa), which ...
J. Brendan Murphy +3 more
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Lithos, 2020
An ensemble of fifteen granodiorite/tonalite plutons and minor intrusions was generated during Cambro-Ordovician times (ca. 498–462 Ma) at the margin of Gondwana, which occupies a large portion of the Central Iberian Zone of the Iberian Massif (Spain and Portugal).
Castro, A. +4 more
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An ensemble of fifteen granodiorite/tonalite plutons and minor intrusions was generated during Cambro-Ordovician times (ca. 498–462 Ma) at the margin of Gondwana, which occupies a large portion of the Central Iberian Zone of the Iberian Massif (Spain and Portugal).
Castro, A. +4 more
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Precambrian Research, 2017
Abstract The Pelagonian terrane in Greece is one of the easternmost Avalonian fragments, as attested by the peri-Amazonian affinity of its lowermost (>700 Ma) metasedimentary unit. In the present study, we obtained zircon ages and U-Pb-Hf data for consecutive rock units comprising the Pelagonian basement. These include newly discovered Ediacaran (ca.
Olga Zlatkin, Dov Avigad, Axel Gerdes
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Abstract The Pelagonian terrane in Greece is one of the easternmost Avalonian fragments, as attested by the peri-Amazonian affinity of its lowermost (>700 Ma) metasedimentary unit. In the present study, we obtained zircon ages and U-Pb-Hf data for consecutive rock units comprising the Pelagonian basement. These include newly discovered Ediacaran (ca.
Olga Zlatkin, Dov Avigad, Axel Gerdes
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Palaeogeography, Palaeoclimatology, Palaeoecology, 2003
Abstract Ecology and tempo of the Lower Palaeozoic radiation of echinoderms are discussed in this paper based on comparison of the diversity patterns observed in Cambro–Ordovician faunas from Laurentia and the northern Gondwana margin. The Cambrian ‘agronomic revolution’ triggered a global radiation of echinoderms, with the progressive disappearance ...
Bertrand Lefebvre, Oldrich Fatka
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Abstract Ecology and tempo of the Lower Palaeozoic radiation of echinoderms are discussed in this paper based on comparison of the diversity patterns observed in Cambro–Ordovician faunas from Laurentia and the northern Gondwana margin. The Cambrian ‘agronomic revolution’ triggered a global radiation of echinoderms, with the progressive disappearance ...
Bertrand Lefebvre, Oldrich Fatka
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Geobios, 2011
Abstract Cambrian-Ordovician sedimentary sequences crop out extensively in the area surrounding the Sarydzhaz River, a remote mountainous region situated in the eastern part of Kyrgyzstan. These sequences, composed essentially of fine siliciclastic lithologies, were deposited on a passive margin of the peri-Gondwanan Karatau-Naryn microplate ...
Taniel Danelian +5 more
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Abstract Cambrian-Ordovician sedimentary sequences crop out extensively in the area surrounding the Sarydzhaz River, a remote mountainous region situated in the eastern part of Kyrgyzstan. These sequences, composed essentially of fine siliciclastic lithologies, were deposited on a passive margin of the peri-Gondwanan Karatau-Naryn microplate ...
Taniel Danelian +5 more
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2014
During the late Katian, high-latitude peri-Gondwanan regions of the Mediterranean Province displayed a dramatic faunal turnover, closely associated with a major shift from siliciclastic to carbonate-dominated sedimentation. In most Mediterranean regions, echinoderm assemblages show patterns of faunal replacement comparable to those already described in
Bertrand Lefebvre +4 more
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During the late Katian, high-latitude peri-Gondwanan regions of the Mediterranean Province displayed a dramatic faunal turnover, closely associated with a major shift from siliciclastic to carbonate-dominated sedimentation. In most Mediterranean regions, echinoderm assemblages show patterns of faunal replacement comparable to those already described in
Bertrand Lefebvre +4 more
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Avalonian and related Peri-Gondwanan terranes of the circum-north atlantic
Journal of Structural Geology, 1997Robert A. Scott, Mary M. Scott
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Cadomian Orogens, peri-Gondwanan correlatives and Laurentia–Baltica connections
Tectonophysics, 2002J.Brendan Murphy +2 more
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2013
During the last years a good deal of works were carried out in the Sardinia Variscides focusing on metamorphic and igneous petrology, structural geology and stratigraphy, the latter mostly in the late orogenic basins. The results along with the increasing availability of geochronological data allows, not only bridging the gap of knowledge between the ...
Oggiano G. +2 more
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During the last years a good deal of works were carried out in the Sardinia Variscides focusing on metamorphic and igneous petrology, structural geology and stratigraphy, the latter mostly in the late orogenic basins. The results along with the increasing availability of geochronological data allows, not only bridging the gap of knowledge between the ...
Oggiano G. +2 more
openaire +2 more sources