Results 51 to 60 of about 874 (166)

Climax of Late Paleoproterozoic Rift‐Related Magmatism in the Columbia Supercontinent: Insights From a 1.77–1.76 Ga Large Igneous Province of the Dunhuang Block, Northwest China

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract Widespread mafic magmatism at ca. 1.8–1.7 Ga across fragments of the Columbia supercontinent records a transition in the Earth's supercontinent cycle. The paleogeographic position of the Dunhuang Block in northwestern China within Columbia, and its role in this tectonic reorganization, remain controversial.
Masumeh Sargazi, Chuan‐Lin Zhang, Xian‐Tao Ye, Zhi‐Hao Song, Hong‐Ran Wang   +4 more
wiley   +1 more source

Controle estrutural do carste hipogênico Toca da Boa Vista - Toca da Barriguda na formação salitre, norte do Cráton São Francisco [PDF]

, 2015
Porosity and permeability along fractured zones of carbonate rocks could be enhanced by ascending fluid flow in karst regions. This work presents a structural analysis of two largest hypogenic caves in South America.
Silva, Renata de Araújo Ennes
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The Glória quartz-monzodiorite: isotopic and chemical evidence of arc-related magmatism in the central part of the Paleoproterozoic Mineiro belt, Minas Gerais State, Brazil

Anais da Academia Brasileira de Ciências, 2006
The Glória quartz-monzodiorite, one of the mafic plutons of the Paleoproterozoic Mineiro belt, is intrusive into banded gneisses, amphibolites, schists and phyllites of the Rio das Mortes greenstone belt, in the southern portion of the São Francisco ...
Ciro A. Ávila, Wilson Teixeira, Umberto G. Cordani, Héctor R. Barrueto, Ronaldo M. Pereira, Veridiana T.S. Martins, Liu Dunyi   +6 more
doaj   +1 more source

The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)

Sedimentology, Volume 73, Issue 3, Page 802-837, April 2026.
ABSTRACT As part of a comprehensive project on sedimentary processes in South America, this study focuses on sediment generation in the intracratonic Paraná Basin and monitors the evolution of sand composition along the Paraná River from central Brazil to the Río de la Plata estuary in Argentina.
Eduardo Garzanti, Marta Barbarano, Mara Limonta, Guido Pastore, Pieter Vermeesch, Giovanni Vezzoli   +5 more
wiley   +1 more source

Exploring the Gravimetric and Geochronological Links in Ancient Terranes of the São Francisco Craton and Borborema Province, NE‐Brazil

Terra Nova, Volume 38, Issue 2, Page 77-86, April 2026.
ABSTRACT Deep crustal fragments and structural lineaments identified through satellite gravity data provide evidence for the extension of the reworked ancient basement of the Central African Block into the northern São Francisco Craton and southern Borborema Province.
Douglas Teixeira Martins, Wagner da Silva Amaral, Felipe Holanda dos Santos, Evilarde Uchôa Filho   +3 more
wiley   +1 more source

As Formações Santo Antônio do Bonito e Rocinha (Grupo Vazante, Minas Gerais): sedimentação gravitacional sin a pós-glacial e fosfogênese na transição Faixa Brasília-Cráton do São Francisco

, 2021
As Formações Santo Antônio do Bonito e Rocinha, unidades basais do Grupo Vazante, compreendem diamictitos, arenitos, pelitos e raros carbonatos, originados de uma sedimentação gravitacional subaquosa, formando um sistema deposicional de slope-apron.
Alexandre Uhlein, Oliveira, Eduardo Luís Carneiro de, Eduardo Luís Carneiro de Oliveira, Uhlein, Gabriel Jubé, Carla Sofia de Sousa Marques, Uhlein, Alexandre, Koester, Edinei, Marques, Carla Sofia de Sousa, Gabriel Jubé Uhlein, Edinei Koester   +9 more
core   +1 more source

Near‐Synchronous Cambrian Evolution of the Transbrasiliano‐Kandi‐4°50′ Shear Zone in South America and Africa

Terra Nova, Volume 38, Issue 2, Page 97-105, April 2026.
ABSTRACT The Transbrasiliano‐Kandi‐4°50′ (TK4) shear zone in western Gondwana crosscuts South America and NW Africa for at least 6000 km. Despite its impressive size, the timing of the main episode of dextral ductile shearing is uncertain. We present detailed in situ multi‐mineral geochronology of mylonites from both Brazil and Algeria supporting that ...
F. A. Caxito, B. V. Ribeiro, F. Alkmim, A. Deramchi, C. L. Kirkland   +4 more
wiley   +1 more source

Idades U-Pb (LA-ICPMS) para as suítes Caraguataí e Jussiape, Bloco Gavião, Bahia

Brazilian Journal of Geology
Resumo: A área de trabalho encontra-se inserida na porção nordeste do Cráton do São Francisco, no Bloco Gavião. O mapeamento geológico realizado na região de Abaíra-Jussiape permitiu identifcar duas suítes magmáticas, que foram denominadas de Caraguataí ...
Simone Cerqueira Pereira Cruz, Maurício Antônio Carneiro, Johildo Salomão Figueiredo Barbosa, Adriano Alberto Marques Martins, Jocilene dos Santos Santana, Leo Teixeira, Guilherme de Souza Silva Tavares Gonçalves, Angela Beatriz Menezes Leal, Elton Dantas, Márcio Pimentel   +9 more
doaj   +1 more source

Borehole Logging Lithological Classification in Carbonatite‐Hosted Niobium Deposit Integrating Geophysical and Geochemical Data With Self‐Organizing Maps

Geophysical Prospecting, Volume 74, Issue 3, March 2026.
ABSTRACT Lithological classification from borehole data remains challenging in geologically complex alkaline–carbonatite systems, where compositional overlap and gradual transitions between lithotypes limit conventional interpretation methods. This study presents an integrated and automated workflow for drill‐core lithological classification using self‐
Fabrizzio R. Costa, Lívia Namie S. Nishimura, Reginaldo Antonio R. Filho, Bruno P. Milanezi, Dong Yaosong, Cleyton de C. Carneiro, Carina Ulsen   +6 more
wiley   +1 more source

Sistema de dobramentos Rio Preto e suas relações com o Cráton do São Francisco

, 1987
O sistema de dobramentos Rio Preto é uma unidade de idade brasiliana (~650 m.a.) que bordeja o Cráton do São Francisco em sua porção noroeste. Caracteriza-se por apresentar uma estrutura assimétrica, com dupla vergência (estrutura em leque), sendo que o ...
Marcos Egydio-Silva, Egydio-Silva, Marcos   +1 more
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