Results 61 to 70 of about 3,579 (174)

Experimental models of 'Basement'-controlled salients - application to the proterozoic fold-thrust belt of the quadrilátero ferrífero (Minas Gerais, Southeastern Brazil)

Anais da Academia Brasileira de Ciências, 2003
Scaled sandbox models are used to simulate the development of ´basement´-controlled, salients. We investigate the controlling factors on the development of closed curvatures in map-view, considering constant both the sand pack thickness and the space ...
Caroline J. S. Gomes, Milton Pereira-Filho, Silvia C. M. Braga   +2 more
doaj   +1 more source

Classificação de bacias de drenagem do Alto Jequitaí (Minas Gerais) a partir da análise de principais componentes e análise de grupos [PDF]

, 2007
Esse artigo objetiva aplicar a análise multivariada para a descrição e classificação dos dados morfométricos de bacias de drenagem. A metodologia pode ser subdividida em quatro etapas: (a) elaboração do Modelo Digital de Terreno (MDT)hidrologicamente ...
Carvalho Júnior, Osmar Abílio de, Carvalho, Ana Paula Ferreira de, Gomes, Roberto Arnaldo Trancoso, Guimarães, Renato Fontes, Machado, Wátila Portela, Martins, Éder de Souza, Oliveira, Sandro Nunes de, Sodré, Robson Veloso Ribeiro   +7 more
core   +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

The development of magmatism along the Cameroon Volcanic Line: Evidence from teleseismic receiver functions

, 2012
[1] The Cameroon Volcanic Line (CVL) in West Africa is a chain of Cenozoic volcanism with no clear age progression. The reasons for its existence are unclear, and the nature of its magmatic plumbing system is poorly understood.
Bastow, I.D., Gallacher, R.J.
core   +1 more source

Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil.

, 2002
Massive hematite ore (MHO) is a special high-grade iron ore, used as lump ore in the process of obtaining direct reduction iron (DRI). The influence of porosity on the reducibility of MHO from the Capitão do Mato Mine (Iron Quadrangle, Brazil) was ...
A.C. Varajao, César, Bruand, Ary, J. Gilkes, Robert, R. Ramanaidou, Erick   +3 more
core   +4 more sources

Schist Belts of the Benin‐Nigeria Shield Reveal a Neoproterozoic History

Terra Nova, Volume 37, Issue 4, Page 239-249, August 2025.
ABSTRACT Belts of metasedimentary rocks (schist belts) in the Benin‐Nigeria Shield (BNS) are investigated for the first time using U–Pb dating and Lu‐Hf isotope analysis of detrital zircons. We report maximum depositional ages that place their deposition firmly in the Neoproterozoic and link them with strata in the Dahomey Belt, the central African ...
Axel Hofmann, Silas Dada, Samuel B. Olobaniyi, Isaac Ajigo, Marlina Elburg, Fabricio A. Caxito, Andrey Bekker   +6 more
wiley   +1 more source

Diamictites and Sturtian Cap Dolomites Covering the Jacobina Group - Araras, North of Campo Formoso - Bahia [PDF]

Geologia USP. Série Científica, 2008
Occurrences of diamictites with a probable glacial origin underlying limestones north of Campo Formoso – BA around Araras village, had already been described by some authors during the 60´s and 70´s.
Augusto José de Cerqueira Lima Pedreira da Silva, Benjamim Bley de Brito Neves   +1 more
doaj  

Toward a More Stable Supercontinent Columbia in the Statherian

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract During the mid‐Proterozoic, nearly all of Earth's continents collided to form supercontinent Columbia. However, the exact timing of its formation is still debated, with estimates ranging from 1.8 to 1.6 Ga. This period, known as the Statherian, is also debated for its affinity to either the Paleoproterozoic or Mesoproterozoic eras.
Chong Wang, Peng Peng, Ross N. Mitchell, Chenglong Deng, Johanna Salminen, Yebo Liu, Uwe Kirscher   +6 more
wiley   +1 more source

Petrology of Gameleira potassic lamprophyres, São Francisco Craton

Anais da Academia Brasileira de Ciências, 2012
Gameleira lamprophyres are dykes and mafic microgranular enclaves associated with the shoshonitic Gameleira monzonite. This association belongs to the Paleoproterozoic alkaline magmatism from Serrinha nucleus, northeast Brazil.
Jorge Plá Cid, Cristiani S. Campos, Lauro V.S. Nardi, Luana Florisbal   +3 more
doaj  

Geochemical baseline and multivariate analysis of potentially toxic elements in stream sediments of the Vazante zinc district, Minas Gerais, Brazil

Frontiers in Environmental Science
Intense land use, driven by mining and agriculture, promotes the dispersal of elements, including potentially toxic ones (PTEs). This dispersal significantly enhances element concentrations in soils, sediments, and water bodies, thereby altering the ...
Rafael Tarantino Amarante, Rafael Tarantino Amarante, Rafael Tarantino Amarante, Eduardo Duarte Marques, Eduardo Duarte Marques, Úrsula Azevedo Ruchkys, Emmanoel Vieira Silva-Filho, Gabriel Soares Almeida, Isadora Mello, Gabriel Negreiros Salomão   +9 more
doaj   +1 more source