Results 161 to 170 of about 62,283 (208)
Some of the next articles are maybe not open access.
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.
Marcelo Belentani de Bianchi +2 more
exaly +2 more sources
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
openaire +1 more source
Timing of Proterozoic magmatism in the Sunsas belt, Bolivian Precambrian Shield, SW Amazonian Craton [PDF]
Geoscience Frontiers, 2021 CITATION: Nedel. I. M. et al. 2021. Timing of Proterozoic magmatism in the Sunsas belt, Bolivian Precambrian Shield, SW Amazonian Craton. Geoscience Frontiers 12:(2021) 101247.
Amarildo S. Ruiz +2 more
exaly +2 more sources
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
exaly +2 more sources
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
openaire +1 more source
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 ...
Amarildo S. Ruiz +2 more
exaly +2 more sources
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source