Results 61 to 70 of about 200 (171)

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

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

Geochemical and tectonic setting of mafic dyke swarms of the Juruena-Teles Pires mineral province, southwestern Amazonian craton, Brazil

Journal of the Geological Survey of Brazil
The present study provides a comprehensive set of whole-rock geochemical, petrographic, and mineral chemistry data on diabase dyke swarms that crosscut the Archean/Paleoproterozoic basement of the Peixoto de Azevedo domain, located in the central ...
Gilmar Rizzotto, Cléber Alves
doaj   +1 more source

Tectonic evolution of the southern margin of the Amazonian craton in the late Mesoproterozoic based on field relationships and zircon U-Pb geochronology

Anais da Academia Brasileira de Ciências, 2014
New U-Pb zircon geochronological data integrated with field relationships and an airborne geophysical survey suggest that the Nova Brasilândia and Aguapeí belts are part of the same monocyclic, metaigneous and metasedimentary belt formed in the late ...
GILMAR J. RIZZOTTO, LÉO A. HARTMANN, JOÃO O.S. SANTOS, NEAL J. MCNAUGHTON   +3 more
doaj   +1 more source

Geophysical contribution for the study of the Granitic Batholit Santa Helena, southwest of the Amazonian Craton [PDF]

Geologia USP. Série Científica, 2012
The Santa Helena batholith is subject of many controversies concerning its geographical extension, lithological constitution,geochemical characterization and geotectonic setting.
Vanessa Biondo Ribeiro, Marta Silvia Maria Mantovani   +1 more
doaj  

Favorability potential for IOCG type deposits in the Riacho do Pontal Belt: new insights for identifying prospects of IOCG-type deposits in NE Brazil

Brazilian Journal of Geology, 2018
: Archean iron oxide-copper-gold (IOCG) deposits have been systematically described in the world class Carajás IOCG district, Amazonian region of Brazil. More recently, several Neoproterozoic (ca 1.13 to 0.96 Ga) IOCG deposits have been identified in the
Sérgio Roberto Bacelar Hühn, Adalene Moreira Silva   +1 more
doaj   +1 more source

SiO2-saturated potassic alkaline magmatism in the central Amazonian Craton, southernmost Uatumã-Anauá Domain, NE Amazonas, Brazil

Brazilian Journal of Geology
: This paper approaches the record of SiO2-saturated potassic alkaline magmatism of Castanhal Quartz Monzonite, Mapuera Suite, and Ladeira da Vovó Quartz Syenite. These samples are located near the Northern border of the Amazon Basin. Such rocks show K2O
Cristóvão da Silva Valério, Moacir José Buenano Macambira, Valmir da Silva Souza, Elton Luiz Dantas   +3 more
doaj   +1 more source

The Paleoproterozoic metaconglomerate-hosted Castelo de Sonhos gold deposit, Tapajós Gold Province, Amazonian Craton: a modified paleoplacer origin

Journal of the Geological Survey of Brazil, 2018
The Castelo de Sonhos gold deposit (~1.5 Moz Au) is located in the southeastern Tapajós Gold Province and is hosted in variably deformed metaconglomerates and metasandstones of the Castelo dos Sonhos Formation, which was deposited between 2011 and 2050 ...
Joana Queiroz, Evandro Klein
doaj   +1 more source

Contribuição ao estudo do magmatismo Paleo e Mesoproterozóico do SW do Craton Amazônico através da aplicação de isótopos estáveis de O, H e S Contribution to the study of the Paleo and Mesoproterozoic magmatism of the SW Amazonian craton based on stable isotopes of O, H and S

Acta Amazonica, 2008
Os isótopos estáveis de O, H e S foram utilizados para investigar a origem das rochas magmáticas nos Terrenos Jauru e Pontes e Lacerda do SW do Craton Amazônico, estado de Mato Grosso, Brasil.
Mauro Cesar Geraldes, Wilson Teixeira, Claudia Sayão Valladares   +2 more
doaj   +1 more source

U-Pb zircon ages of rocks from the Amazonas Territory of Colombia and their bearing on the tectonic history of the NW sector of the Amazonian Craton

Brazilian Journal of Geology
: Here we report the results of several U-Pb zircon ages, made to generate an integrated history for the Rio Negro-Juruena tectonic province, for the northwestern part of the Amazonian Craton.
Umberto Giuseppe Cordani, Kei Sato, Walter Sproessner, Fabiana Santos Fernandes   +3 more
doaj   +1 more source