Results 1 to 10 of about 200 (171)

Paleomagnetism of the Amazonian Craton and its role in paleocontinents [PDF]

Brazilian Journal of Geology, 2016
: In the last decade, the participation of the Amazonian Craton on Precambrian supercontinents has been clarified thanks to a wealth of new paleomagnetic data.
Manoel Souza D'Agrella-Filho, Franklin Bispo-Santos, Ricardo Ivan Ferreira Trindade, Paul Yves Jean Antonio   +3 more
doaj   +3 more sources

Archean crust and metallogenic zones in the Amazonian Craton sensed by satellite gravity data. [PDF]

Sci Rep, 2019
AbstractThe formation of ore deposits has been extensively studied from a shallow crust perspective. In contrast, the association of mineral systems with deep crustal structure of their host terranes remains relatively undisclosed, and there is evidence that processes throughout the lithosphere are coupled for their evolution.
Motta JG, Souza Filho CR, Carranza EJM, Braitenberg C.   +3 more
europepmc   +5 more sources

Extensional exhumation of cratons: insights from the Early Cretaceous Rio Negro–Juruena belt (Amazonian Craton, Colombia) [PDF]

Solid Earth, 2023
This study presents results from apatite fission track (AFT) thermochronology to investigate the thermal history and exhumation dynamics of the Rio Negro–Juruena basement, situated within the western Guiana Shield of the Amazonian Craton.
A. Fonseca, S. Nachtergaele, A. Bonilla, S. Dewaele, J. De Grave   +4 more
doaj   +5 more sources

The role of V-shaped oceans and ribbon continents in the Brasiliano/PanAfrican assembly of western Gondwana [PDF]

Scientific Reports, 2023
Western Gondwana amalgamated by collision of continental blocks that did not form prior conjugated margins (extroversion), and by typical Wilson cycles, when continental blocks that rifted away giving birth to new oceans were subsequently re-joined in ...
Fabrício de Andrade Caxito, Fernando Flecha Alkmim   +1 more
doaj   +2 more sources

The Novo Progresso Formation, Tapajós Gold Province, Amazonian Craton: zircon U-Pb and Lu-Hf constraints on the maximum depositional age, reconnaissance provenance study, and tectonic implications [PDF]

Journal of the Geological Survey of Brazil, 2018
The Novo Progresso Formation, located in southeastern Tapajós Gold Province, at its boundary with the Iriri-Xingu Domain, south of the Amazonian Craton, is composed of quartz- and lithic-arenites and siltstones with volcanic/volcanoclastic contributions,
Evandro Klein, Stella Bijos Guimarães, Joseneusa Brilhante Rodrigues, Cesar Lisboa Chaves, Sulsiene Machado Souza-Gaia, Elem Cristina dos Santos Lopes, João Marcelo Rodrigues Castro   +6 more
doaj   +5 more sources

Weight-Length Ratio of Piranhas <i>Serrasalmus</i> (Characiformes, Serrasalmidae) in Bolivia: Relationships to Molecular Divergence and Maximum Size? [PDF]

Ecol Evol
This study presents WLRs of nine piranha or palometa fish species of genus Serrasalmus present in the Amazon and La Plata basins of Bolivia and compares differences with genetic divergence (mtDNA COI locus) and the observed maximum size. All species showed an exponential (power type) growth pattern, and all WLRs were significantly different among all ...
Carvajal-Vallejos FM, Gallo-Cardozo F, Careaga M, Campero M.   +3 more
europepmc   +2 more sources

An Overview of the Amazonian Craton Evolution: Insights for Paleocontinental Reconstruction

International Journal of Geosciences, 2015
The Amazonian craton major accretionary and collisional processes may be correlated to supercontinent assemblies developed at several times in the Earth history. Based on geologic, structural and paleomagnetic evidence paleocontinent reconstructions have been proposed for Archean to younger times.
Santos A C, Mauro Geraldes
exaly   +3 more sources

Thermo‐Compositional Structure of the South American Platform Lithosphere: Evidence of Stability, Modification, and Erosion

Geochemistry, Geophysics, Geosystems, 2022
Constraints on the structure of cratonic lithosphere are essential to improve our understanding of craton formation, evolution and long‐term stability.
Isabella Altoe, Saskia Goes, Marcelo Assumpção   +2 more
doaj   +1 more source

Composition and P-T conditions of the lithospheric mantle beneath the Azimuth 125º Lineament, Northern and Southern Brazil: constraints from peridotite xenoliths enclosed in diamond-bearing kimberlites

Journal of the Geological Survey of Brazil, 2022
We present new petrographic and chemical data together with calculated P-T equilibrium conditions of peridotite xenoliths enclosed in kimberlites from Rondônia, Northern Brazil (Cosmos-1 and Carolina-1) and Minas Gerais, Southeastern Brazil (Canastra-1)
Vidyã Vieira Almeida, Joseneusa Brilhante Rodrigues, Izaac Cabral Neto, Francisco Valdir Silveira, Homero Braz Silva   +4 more
doaj   +1 more source

Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil [PDF]

Brazilian Journal of Geology, 2022
Orthopyroxene-bearing tonalites/trondhjemites with scarce quartz diorites comprise the Café enderbite that crops out in three Neoarchean plutons in the central portion of the Canaã dos Carajás domain, Carajás Province, northern Brazil.
Bhrenno Marangoanha, Davis Carvalho de Oliveira, Cláudio Nery Lamarão, Gisele Tavares Marques, Luciano Ribeiro da Silva   +4 more
doaj   +1 more source