Paleoproterozoic volcanic centers of the São Félix do Xingu region, Amazonian craton, Brazil: Hydrothermal alteration and metallogenetic potential

2016 ◽  
Vol 320 ◽  
pp. 75-87 ◽  
Author(s):  
Raquel Souza da Cruz ◽  
Carlos Marcello Dias Fernandes ◽  
Raimundo Netuno Nobre Villas ◽  
Caetano Juliani ◽  
Lena Virgínia Soares Monteiro ◽  
...  
Keyword(s):  
Hydrothermal Alteration ◽  
Amazonian Craton

scholarly journals ANÁLISE PETROGRÁFICA DOS IGNIMBRITOS BEM PRESERVADOS DA FORMAÇÃO CACHOEIRA DA ILHA, CENTRO-NORTE DO CRÁTON AMAZÔNICO, ESTADO DE RORAIMA

2020 ◽  
Vol 30 (1) ◽  
pp. 100-114
Author(s):  
Nazaré Barbosa ◽  
Hilberto Soares ◽  
Lorena Feitosa
Keyword(s):  
Low Temperature ◽  
Hydrothermal Alteration ◽  
Glass Matrix ◽  
Welding Process ◽  
Central Portion ◽  
North Central ◽  
Pyroclastic Rocks ◽  
The North ◽  
Amazonian Craton

The Cachoeira da Ilha Formation (FCI) is located in the north central portion of the Amazonian Craton, northeast of Roraima. It is found by ignimbritic rocks with about 1990 Ma. Acid pyroclastic rocks in the region of the municipality of Amajari were classified as ignimbrites: solid, moderately welded and rheomorphic from variations in the degree in the welding process, proportion and type of pyroclasts and textural aspects. The crystalloclasts are made of quartz, sanidine and plagioclase and are dispersed in a glass-matrix. They are usually found with corrosion, dentate and intensely sericitized and/or saussuritized gulfs, showing low temperature hydrothermal alteration. It is also possible to distinguish mafic, microporphyritic and cognate lithitic fragments.

The Batalha Au–granite system—Tapajós Gold Province, Amazonian craton, Brazil: hydrothermal alteration and regional implications

2002 ◽  
Vol 119 (1-4) ◽  
pp. 225-256 ◽  
Author(s):  
Caetano Juliani ◽  
Rafael H Corrêa-Silva ◽  
Lena V.S Monteiro ◽  
Jorge S Bettencourt ◽  
Carmen M.D Nunes
Keyword(s):  
Hydrothermal Alteration ◽  
Amazonian Craton

A study of the hydrothermal alteration in Paleoproterozoic volcanic centers, São Félix do Xingu region, Amazonian Craton, Brazil, using short-wave infrared spectroscopy

2015 ◽  
Vol 304 ◽  
pp. 324-335 ◽  
Author(s):  
Raquel Souza da Cruz ◽  
Carlos Marcello Dias Fernandes ◽  
Raimundo Netuno Nobre Villas ◽  
Caetano Juliani ◽  
Lena Virgínia Soares Monteiro ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Hydrothermal Alteration ◽  
Short Wave ◽  
Amazonian Craton ◽  
Short Wave Infrared

Detection of slip surface in earth slide based on mineral assemblages -An example of hydrothermal alteration zone landslide in East Hokkaido Japan-

2014 ◽  
Vol 51 (3) ◽  
pp. 106-112
Author(s):  
Hiroyuki MAEDA ◽  
Masanori KOHNO ◽  
Yoshihiko SEKISHITA ◽  
Satoshi UEMATSU ◽  
Hiroshi NAYA
Keyword(s):  
Hydrothermal Alteration ◽  
Slip Surface ◽  
Alteration Zone ◽  
Mineral Assemblages
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