Auriferous Quartz Veins from Northeastern Brazil: A Fluid-Inclusion Study

Autor:	Roberto B. Dos Santos, Marcelo R. R. Da Silva, Hartmut Beurlen
Rok vydání:	1997
Předmět:	Arsenopyrite Geochemistry Schist Geology Epidote engineering.material Sericite Sphalerite Galena visual_art engineering visual_art.visual_art_medium Fluid inclusions Pyrite
Zdroj:	International Geology Review. 39:578-588
ISSN:	1938-2839 0020-6814
DOI:	10.1080/00206819709465289
Popis:	Auriferous quartz veins are known to exist in more than two dozen prospects, encompassing an area of 500 km2 northward from Serrita township (state of Pernambuco) in northeastern Brazil. Gold-bearing veins occur either with a strike of 70° to 110°, crosscutting muscovite schists of the Middle Proterozoic Salgueiro Group, or with a strike of 330° in granodiorite intrusions in the same schists. Small amounts of pyrite, galena, arsenopyrite, chalcopyrite, and sphalerite commonly are observed. Sericite, chlorite, and epidote are the most common wall-rock alteration products. Fluid inclusions were studied in samples of mineralized quartz veins from the Barra Verde III prospect in a small granodiorite body, and from the Inga, Sabura, and Riacho do Meio prospects in the Salgueiro schists. Some samples of barren quartz veins also were studied for comparison. Primary and pseudosecondary inclusions in the mineralized veins are triphasic or biphasic aqueous-carbonic at room temperature. The wide range of the CO2/H2O...
Databáze:	OpenAIRE
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