Results 71 to 80 of about 848 (205)

Geology and petrology of the Salto do Céu Suite: tectonic and stratigraphic implications on the SW Amazonian Craton

Brazilian Journal of Geology
: The basic rocks of the Salto do Céu Suite outcrop as sills and flows in the southwestern Amazon Craton, Rondonian-San Ignacio Province, with an age of about 1.44 Ga. Sills are 2 to 30 m thick being hosted by pelites of the Aguapei Group.
Gabrielle Aparecida de Lima, Moacir José Buenano Macambira, Maria Zélia Aguiar de Sousa, Amarildo Salina Ruiz, Maria Elisa Fróes Batata, Ronaldo Pierosan   +5 more
doaj   +1 more source

Serra Sul diamictite of the Carajás Basin (Brazil): A Paleoproterozoic glaciation on the Amazonian craton [PDF]

Geology, 2019
Abstract This paper reports the discovery of glacial deposits of likely Siderian–Rhyacian age (2.58–2.06 Ga) in South America (Carajás Basin, Brazil), thereby expanding the potential reach of Paleoproterozoic glaciations to the Amazonian craton for the first time.
Raphael Araújo, Afonso Nogueira
openaire   +1 more source

Neoproterozoic sedimentary deposits of the Tucuruí Group – Araguaia Belt, Northestern of Pará state [PDF]

Geologia USP. Série Científica, 2014
The Tucuruí Group of Neoproterozoic age outcrops in Tucuruí region, northeastern of Pará state, along with the transition between the Amazonian Craton and Araguaia Belt.
Alessandra de Cássia dos Santos Dutra, Paulo Sergio de Sousa Gorayeb, Afonso César Rodrigues Nogueira   +2 more
doaj   +1 more source

The 1.88 Ga Uatumã Magmatism in the Serra dos Magalhães region: petrology and implications to the extension of the south-eastern edge of the Amazonian Craton

Brazilian Journal of Geology, 2020
The Amazonian Craton (AC) is a Pre-Cambrian tectonic segment that extends over 4.3 × 105 km2 at the northern portion of the South American Platform. Phanerozoic sedimentary basins cover most of the edges of the AC and sparse occurrences of Precambrian ...
Ianna Ferreira de Lima, Ronaldo Pierosan, Márcia Aparecida de Sant'Ana Barros, Rogério Roque Rubert, Carlos Augusto Sommer, Diogo Isamu de Almeida Okuno   +5 more
doaj   +1 more source

SGLOBE‐Q2D: A Global 2‐D Model of Fundamental and Higher Mode Rayleigh Wave Attenuation From a Large Amplitude Data Set

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 7, July 2025.
Abstract We present SGLOBE‐Q2D, a global upper mantle model of frequency‐dependent Rayleigh wave attenuation with uncertainties. We use a data set of ∼ ${\sim} $10 million fundamental and higher mode (up to 4th overtone) Rayleigh wave amplitude measurements with wave periods T∼ ${\sim} $38–275 s.
William Sturgeon, Ana M. G. Ferreira
wiley   +1 more source

Linking the Neoproterozoic to Early Paleozoic Belts Bordering the West African and Amazonian Cratons

, 2023
Correlations between the Neoproterozoic belts surrounding the West African Craton and northern Brazilian cratons have long been a subject of interest and controversies. Due to the splitting of African and South American continents by the Atlantic oceanic domains, no direct links are preserved, requiring relying on various geological or geophysical ...
Michel Villeneuve, Camille Rossignol
openaire   +1 more source

Reassessment of the geology of the southeastern Tapajós Gold Province, Amazonian Craton, Brazil, based on field, petrographic, and airborne geophysical data

Journal of the Geological Survey of Brazil, 2019
The Tapajós Gold Province, central portion of the Amazonian Craton, is one of the main metallogenic provinces in Brazil, but lack geological studies at an appropriate scale in its southeastern portion. Fieldwork, petrography, and high-resolution airborne
Stella Bijos Guimarães, Evandro Luiz Klein, Raphael Teixeira Correa   +2 more
doaj   +1 more source

New Kinematic Model of the Early Opening of the Equatorial Atlantic Realm

Tectonics, Volume 44, Issue 5, May 2025.
Abstract The opening of the Equatorial Atlantic Ocean constitutes the final stage of Gondwana's breakup, leading to the separation of the African and South American continents. The early spreading has been debated due to the absence of magnetic anomalies related to the Early Cretaceous opening at low latitude, and an incomplete fracture zone record ...
Thomas Lesourd—Laux, Christophe Basile, Walter Roest, Frauke Klingelhoefer, Sabin Zahirovic, Nicky M. Wright, David Graindorge, Martin Patriat, Lies Loncke, François Sapin   +9 more
wiley   +1 more source

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

, 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.
Liberal Fonseca, Ana Carolina, De Grave, Johan, Bonilla, Amed, Nachtergaele, Simon, Dewaele, Stijn   +4 more
core   +1 more source

Latest Cretaceous to Cenozoic Exhumation Patterns in the Northern Andes From the Sedimentary Provenance Record on the Broken Retro‐Foreland Putumayo Basin

Basin Research, Volume 37, Issue 3, May/June 2025.
(A) Tectonic model of the Putumayo Basin showing the several collisional events that triggered the inversion of preexistent Jurassic rift sequences during the Upper Cretaceous and their influence in the provenance sources from the synorogenic deposits. Brown arrows suggest Amazonian and Putumayo basement sources, dark green arrows suggest a provenance ...
Giovanny Nova, Mauricio Parra, Agustín Cardona, Brian K. Horton, Victor A. Valencia, Andrés Mora, Cleber Soares   +6 more
wiley   +1 more source