Results 1 to 10 of about 884 (156)
Structural controls on the Bonsucesso Zinc-Lead Deposit, Vazante Group, Brazil [PDF]
Brazilian Journal of Geology, 2023 The Bonsucesso zinc-lead (Zn-Pb) sulfide deposit is hosted in carbonate rocks from the Vazante Group (transition of the Mesoproterozoic to the Neoproterozoic time), northwest of Minas Gerais State, Brazil. Regional deformation is associated with the thin-
Edson Ricardo Maia Ferraz +3 more
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Petrography and geochemistry of metamafic rocks intercalated in gneisses from Goiás Magmatic Arc, region of Indiara (GO) [PDF]
Geologia USP. Série Científica, 2015 In Indiara region (GO), dozens of metamafic rocks lenses of various dimensions (metric to kilometric) occur, intercalated in gneisses of the Goiás Magmatic Arc and oriented according to the direction of the main foliation (Sn).
Guillermo Rafael Beltran Navarro +4 more
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Geophysical Monograph Series, Page 1-26., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst +8 more
wiley +1 more source
Applied Computing and Geosciences, 2023 The Tikhonov regularization parameter is a key parameter controlling the smoothness degree and oscillations of a regularized unknown solution. Usual methods to determine a proper parameter (L-curve or the discrepancy principle, for example) are not ...
Janaína Anjos Melo +2 more
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The Araxá Group in the South-Southwest Region of the Goiás State [PDF]
Geologia USP. Série Científica, 2013 In the S – SW region of Goiás State, Brazil, the Araxá Group is constituted of a metasedimentary sequence containing schistoseand gneissic (garnet-biotite-quartz schists, feldspatic garnet-biotite-quartz schists, garnet-biotite-quartz paragneisses,with ...
Guillermo Rafael Beltran Navarro +2 more
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Anais da Academia Brasileira de Ciências, 2014 The chemical and spectrometric procedures of the U-Pb geochronology method on monazites, recently installed in the LAGIR laboratory, are described in detail.
CARLA C.A. NETO +4 more
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Anais da Academia Brasileira de Ciências, 2003 The Itapuranga alkali granite and Uruana quartz syenite are large K-rich EW-elongated intrusions, in the central part of the Neoproterozoic Brasília Belt, central Brazil.
MÁRCIO M. PIMENTEL +3 more
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Brazilian Journal of Geology, 2019 Combined Sm-Nd isotope studies and U-Pb ages of detrital zircons have shown significant differences between the provenance patterns of Neoproterozoic metasedimentary successions in the Southern Brasília belt.
Manuela de Oliveira Carvalho +4 more
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Journal of the Geological Survey of Brazil, 2022 We present new petrographic and chemical data together with calculated P-T equilibrium conditions of peridotite xenoliths enclosed in kimberlites from Rondônia, Northern Brazil (Cosmos-1 and Carolina-1) and Minas Gerais, Southeastern Brazil (Canastra-1)
Vidyã Vieira Almeida +4 more
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Provenance and sedimentary analysis of the basal portion of the Bambuí Group at Arcos (MG) [PDF]
Geologia USP. Série Científica, 2013 The origin and evolution of Bambuí Basin has been a matter of debate, in much intensified by the recent exploratory efforts carried out by public and private companies looking for natural gas.
Matheus Kuchenbecker +5 more
doaj +1 more source