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- W2181687941 abstract "The Precambrian banded iron formation from the Quadrilatero Femfero and from the Ouro Fino syncline (Minas Gerais, Brazil) display some gold showings as quartz veins, and some gold anomalies in the surficial alteration facies.Fresh and altered rocks as well as quartz veins crosscutting the Ouro Fino series have been sampled in order to understand the factors controlling gold mobility in the itabirite series during hydrothermal vein formation, and during laterite formation. Fresh itabirites display rather high gold concentrations which range from 30 to 40 ppb. In laterites, the gold content remains relatively high but may vary significantly from the bottom to the top of the hills, and within the different horizons from 20 to 60 ppb Thus, fresh and altered itabirites may have constituted significant source rocks for gold. Systematic fluid inclusion studies by using microthermometry and Raman spectrometry analysis have been carried out on different types of quartz veins. At the hydrothermal stage, gold deposition seems to be restricted to the veins characterized by the presence of C-H-O-S fluids characterized by rather low f02 (around that ked by the Ni- Ni0 oxygen buffer) whilst no gold was found in the quartz-specularite veins characterized by high fO2 (f02 greater than that fixed by the Hematite-magnetite buffer) and sulfate rich solutions." @default.
- W2181687941 created "2016-06-24" @default.
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- W2181687941 date "1991-01-01" @default.
- W2181687941 modified "2023-09-27" @default.
- W2181687941 title "Gold mobility during hydrothermal and supergene alteration of BIF (Itabirites), Ouro Fino syncline, Brazil" @default.
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