Results 51 to 60 of about 200 (171)

Intense weathering attending the emergence of the SE Amazonian Craton during the Neoarchean

Journal of the Geological Society
Sedimentological evidence and detrital zircon provenance analysis show that the Amazonian Craton, Brazil, was subjected to large-scale subaerial erosion by c. 2.7 Ga. To assess weathering conditions attending the emergence of the Amazonian Craton, we used the chemical composition of terrigenous sediments deposited ...
Rossignol, Camille, Siciliano Rego, Eric, Tribovillard, Nicolas, Pellerin, Alice, Thomazo, Christophe, Philippot, Pascal   +5 more
openaire   +3 more sources

A Recipe for Exotic Continental Fragment Formation: Key Constraints From Numerical Rift Models

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 10, October 2025.
Abstract The Wilson Cycle describes the opening and closing of oceans, generating new plate boundaries at continental rifts, and extinguishing ancient plate boundaries with continental collisions (creating a continental suture). However, the general view of the Wilson Cycle does not fully explain more complex tectonic scenarios.
Alan J. Yu, Erkan Gün, Kenneth J. W. McCaffrey, Philip J. Heron   +3 more
wiley   +1 more source

Seismic Imaging of the Transition From Normal to Flat Subduction in Southern Peru by Full Waveform Inversion of Teleseismic Waves

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 10, October 2025.
Abstract The high topography of the central Andes (15–28°S) is supported by thick crustal roots. The recent uplift of the Altiplano is often explained by crustal shortening and subsequent delamination of the lower crust, though its deep structure and plateau formation processes remain debated.
Li‐Yu Kan, Vadim Monteiller, Anne Socquet, Hernando Tavera, Sébastien Chevrot   +4 more
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

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

Deformation and Sediment Provenance of the Forearc Basin in the Central Andes of Southern Peru

Tectonics, Volume 44, Issue 8, August 2025.
Abstract The linkages between the development of the forearc regions and the accompanying retroarc in contractional mountain belts remain unclear. In the central Andes of southern Peru, new results constrain the timing of deformation and the provenance of forearc basin fill during Cenozoic mountain building.
Brenden J. Britt, Nicholas D. Perez
wiley   +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

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

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