Results 181 to 190 of about 275,631 (233)
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Special Publications, 2020
In the Variscan Orogen, the NW Iberian Massif exposes a variety of ophiolites formed at c. 500 and c. 400 Ma that provide constraints on the Paleozoic evolution of the NNW African margin of Gondwana which culminated in the assembly of Pangaea.
S. Sánchez Martínez +4 more
semanticscholar +1 more source
In the Variscan Orogen, the NW Iberian Massif exposes a variety of ophiolites formed at c. 500 and c. 400 Ma that provide constraints on the Paleozoic evolution of the NNW African margin of Gondwana which culminated in the assembly of Pangaea.
S. Sánchez Martínez +4 more
semanticscholar +1 more source
Geological Society of America Abstracts with Programs, 2021
R. Wintsch, R. Deasy
semanticscholar +2 more sources
R. Wintsch, R. Deasy
semanticscholar +2 more sources
Special Publications, 2020
Uppermost Silurian–Lower Devonian felsic rocks in the bimodal volcanic suite of the Tobique Group in the northwestern mainland Appalachians (northern New Brunswick, Canada) form part of an overstep sequence deposited across the accreted vestiges of ...
J. Dostal, R. Wilson, P. Jutras
semanticscholar +1 more source
Uppermost Silurian–Lower Devonian felsic rocks in the bimodal volcanic suite of the Tobique Group in the northwestern mainland Appalachians (northern New Brunswick, Canada) form part of an overstep sequence deposited across the accreted vestiges of ...
J. Dostal, R. Wilson, P. Jutras
semanticscholar +1 more source
Late Neoproterozoic Avalonian and related peri-Gondwanan rocks of the Newfoundland Appalachians
1996Distinct groupings of late Neoproterozoic tectonomagmatic and depositional events at 760 Ma, 685–670 Ma, 635–590 Ma and 590–545 Ma are recognized within the peri-Gondwanan margin of the Newfoundland Appalachians. This pre-Iapetan orogenic activity resulted in amalgamation of distinctive tectonic packages prior to deposition of a shale-rich platformal ...
S. J. O'Brien +3 more
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Geology, 2003
The Smith River allochthon is in a southern Appalachian belt of metaclastic rocks that has traditionally been considered to be of peri-Laurentian origin. New Th-U-Pb monazite ages confirm that the allochthon was involved in an Early Cambrian tectonothermal event, indicate that it was exotic with respect to adjacent Laurentian rocks, and indicate that ...
James P Hibbard, Robert J Tracy
exaly +2 more sources
The Smith River allochthon is in a southern Appalachian belt of metaclastic rocks that has traditionally been considered to be of peri-Laurentian origin. New Th-U-Pb monazite ages confirm that the allochthon was involved in an Early Cambrian tectonothermal event, indicate that it was exotic with respect to adjacent Laurentian rocks, and indicate that ...
James P Hibbard, Robert J Tracy
exaly +2 more sources
GSA Bulletin, 2019
The Permian Basin of west Texas, one of the most economically significant hydrocarbon basins in the United States, formed along the southwest margin of Laurentia in the foreland of the Ouachita-Marathon orogen during the late Paleozoic.
Li Liu, D. Stockli
semanticscholar +1 more source
The Permian Basin of west Texas, one of the most economically significant hydrocarbon basins in the United States, formed along the southwest margin of Laurentia in the foreland of the Ouachita-Marathon orogen during the late Paleozoic.
Li Liu, D. Stockli
semanticscholar +1 more source
Gondwana Research, 2015
Precambrian to Ordovician sedimentary basins of Wales display contrasting histories across major NE-striking fault systems. Northeast of the Menai Strait Fault System the Monian Supergroup is a deformed succession of mainly metaclastic rocks. Within the fault system the Arfon Basin contains sandstone and slate overlying Neoproterozoic volcanic rocks ...
John W F Waldron +2 more
exaly +3 more sources
Precambrian to Ordovician sedimentary basins of Wales display contrasting histories across major NE-striking fault systems. Northeast of the Menai Strait Fault System the Monian Supergroup is a deformed succession of mainly metaclastic rocks. Within the fault system the Arfon Basin contains sandstone and slate overlying Neoproterozoic volcanic rocks ...
John W F Waldron +2 more
exaly +3 more sources
Gondwana Research, 2013
Abstract The eastern branch of the Romanian Carpathians – the East Carpathians – is essentially an Alpine thrust and fold belt made up in its median part by a Crystalline–Mesozoic zone. This, in turn, is built up by several Alpine nappes (top to bottom): the Wildflysch, Bucovinian, Subbucovinian and Infrabucovinian.
Ioan Balintoni, Constantin Balica
exaly +2 more sources
Abstract The eastern branch of the Romanian Carpathians – the East Carpathians – is essentially an Alpine thrust and fold belt made up in its median part by a Crystalline–Mesozoic zone. This, in turn, is built up by several Alpine nappes (top to bottom): the Wildflysch, Bucovinian, Subbucovinian and Infrabucovinian.
Ioan Balintoni, Constantin Balica
exaly +2 more sources
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.
O. Zlatkin, D. Avigad, A. Gerdes
semanticscholar +2 more sources
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.
O. Zlatkin, D. Avigad, A. Gerdes
semanticscholar +2 more sources
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
openaire +1 more source