Results 121 to 130 of about 200 (171)
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The structure of the Amazonian craton: Available geophysical evidence
Journal of South American Earth Sciences, 2016Abstract The Amazonian craton, which covers a large area of South America, and is thought to have been stable since the end of the Mesoproterozoic, has recently benefited from a series of regional geophysical surveys. The Amazonian craton comprises the northern Guyana shield and the southern Central Brazil shield.
João Rosa, Reinhardt Fuck
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Tectonic domains in the NW Amazonian Craton from geophysical and geological data
Precambrian Research, 2022German A Prieto, Mauricio Ibanez-Mejia
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Evidence of a Palaeoproterozoic SLIP, northern Amazonian Craton, Brazil
Journal of South American Earth Sciences, 2021Abstract The Orocaima SLIP consists of an association of acid-intermediate volcanic-plutonic rocks. The volcanic rocks were generated in explosive eruptions through low eruptive columns, probably associated with fissural volcanism in the north of the Amazonian Craton, Brazil, between 2.0 and 1.98 Ga.
Nazaré A. Barbosa +4 more
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A review of the geochronology of the Amazonian Craton: Tectonic implications
Precambrian Research, 1989Abstract The available geochronological data for the Amazonian Craton permit delineation of its main age provinces and their respective tectonic development. Demarcation of the boundaries of each age province is primarily based on Rb-Sr whole-rock isochrons, supported by K-Ar determinations on minerals.
W TEIXEIRA +3 more
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Deep seismic profile of the Amazonian Craton (northern Brazil)
Tectonics, 1992Deep seismic profiling of the Amazonian craton (northern Brazil) reveals previously unknown deep structural features buried beneath a thin, relatively flat Phanerozoic sedimentary cover (Amazon basin). The seismic signature of the Precambrian crust is characterized by a transparent shallow basement down to 8–9 km followed by a highly reflective middle ...
Renato M. D. de Matos, Larry D. Brown
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Geological Society, London, Special Publications, 2021
Abstract This paper overviews the Proterozoic large igneous provinces (LIPs) of the Amazonian Craton, characterized by large volumes of extrusive and intrusive magmatic rocks. We reassess the geologic, geochronological and geochemical information to stablish three intracontinental felsic volcanic–plutonic igneous belts (i.e.
Nelson Joaquim Reis +5 more
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Abstract This paper overviews the Proterozoic large igneous provinces (LIPs) of the Amazonian Craton, characterized by large volumes of extrusive and intrusive magmatic rocks. We reassess the geologic, geochronological and geochemical information to stablish three intracontinental felsic volcanic–plutonic igneous belts (i.e.
Nelson Joaquim Reis +5 more
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Earth-Science Reviews, 2020
Abstract It is generally recognized that the Columbia (Nuna) supercontinent was assembled during the Paleoproterozoic (2.1–1.8 Ga) planetary-scale orogenic events. Paleomagnetic and palinspastic modeling proposes more than a dozen configurations for the Paleoproterozoic supercontinent. The locations and connections of the different continental blocks
R.A. Terentiev, M. Santosh
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Abstract It is generally recognized that the Columbia (Nuna) supercontinent was assembled during the Paleoproterozoic (2.1–1.8 Ga) planetary-scale orogenic events. Paleomagnetic and palinspastic modeling proposes more than a dozen configurations for the Paleoproterozoic supercontinent. The locations and connections of the different continental blocks
R.A. Terentiev, M. Santosh
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Increments to the genus Swartzia (Leguminosae) from the southern Amazonian Craton
Kew Bulletin, 2013To advance ongoing revisionary research on the neotropical genus Swartzia, we studied herbarium collections from the southern Amazonian Craton of Brazil. Among these collections four previously undocumented species were discovered: Swartzia lanata, S. prancei, S. rugosa and S. rondoniensis, each individually diagnosable and endemic to the region.
Benjamin M. Torke +1 more
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Crustal thickness estimation and tectonic analysis of the Amazonian Craton from gravity data
Journal of South American Earth Sciences, 2021Abstract The crustal thickness in South America has been mostly determined using seismological techniques. However, because these techniques provide point constraint or profile-specific results, the crustal thickness maps become especially dependent on both the number and spatial distribution of seismological stations.
Yellinson de Moura Almeida +4 more
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Emplacement and deformation of the A-type Madeira granite (Amazonian Craton, Brazil)
Lithos, 2017Abstract The Madeira granite is one of the Paleoproterozoic (1.82 Ga) A-type granite intrusions in the Amazonian Craton. It is elongated in the NE–SW direction and is composed of four facies. Classical structural techniques and the anisotropy of magnetic susceptibility (AMS) method were applied to the study of its internal fabric.
Astrid Siachoque +2 more
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