Results 161 to 170 of about 848 (205)
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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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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 Willy Corrêa Rosa +1 more
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Crustal structure of the Amazonian Craton and adjacent provinces in Brazil
Journal of South American Earth Sciences, 2017Abstract The study of the crust using receiver functions can provide valuable geological information, such as average crustal composition, its formation dynamics and the tectonic evolution of a region, as well as serve as an initial reference for the generation of seismic wave velocity models to improve earthquake location.
Diogo Farrapo Albuquerque +2 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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A review of the tectonic evolution of the Sunsás belt, SW Amazonian Craton
Journal of South American Earth Sciences, 2010Abstract The Sunsas–Aguapei province (1.20–0.95 Ga), SW Amazonian Craton, is a key area to study the heterogeneous effects of collisional events with Laurentia, which shows evidence of the Grenvillian and Sunsas orogens. The Sunsas orogen, characterized by an allochthonous collisional-type belt (1.11–1.00 Ga), is the youngest and southwesternmost of ...
Wilson Teixeira +2 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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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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The Rondonian-San Ignacio Province in the SW Amazonian Craton: An overview
Journal of South American Earth Sciences, 2010Abstract The Rondonian-San Ignacio Province (1.56–1.30 Ga) is a composite orogen created through successive accretion of arcs, ocean basin closure and final oblique microcontinent–continent collision. The effects of the collision are well preserved mostly in the Paragua Terrane (Bolivia and Mato Grosso regions) and in the Alto Guapore Belt and the ...
Bettencourt, Jorge Silva +5 more
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