NDLI: Zonas de alteração hidrotermal e paragênese do minério de cobre do Alvo Bacaba, Província Mineral de Carajás (PA)

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Zonas de alteração hidrotermal e paragênese do minério de cobre do Alvo Bacaba, Província Mineral de Carajás (PA)

Content Provider	Semantic Scholar
Author	Augusto, Rafael Alves Monteiro, Lena Virgínia Soares Xavier, Roberto Filho, Carlos Roberto De Souza
Copyright Year	2008
Abstract	The Bacaba prospect is located at 7 km from the Sossego iron oxide-copper-gold deposit in the Carajas Mineral Province. It represents a satellite copper deposit associated with the Sossego deposit. This study aims the identification of hydrothermal alteration patterns, which might represent distal portions of the Sossego hydrothermal system. The results permitted the recognition of hydrothermal alteration zones represented by early albitization, intense scapolitization, potassic alteration, magnetite formation, chloritization, copper mineralization, and sericitization. These alteration stages were recognized in different host rocks (granite and gabbro). The copper mineralization was late and spatially related to potassic alteration with predominance of potassic feldspar. Temperature (~500 o C to < 300 o C) and salinity decrease, coupled with increase of f O 2 conditions could have favored metal deposition from the metalliferous fluid. Ore and gangue minerals (chalcopyrite, galena, bornite, chalcocite, melonite, hessite, altaite, magnetite, hematite, uraninite, cassiterite, ferberite, allanite, apatite, monazite, and cheralite) reflect a Cu-Fe-Ni-Te-Ag-Pb-U-Sn-W-ETR-Th-P signature. The identified sequence of hydrothermal alteration stages in the Bacaba prospect is similar to that described for the Sossego deposit, despite scapolite abundance at Bacaba. This suggests that these deposits represent different portions of a single hydrothermal system. Influx of diluted, meteoric fluids might be more important at Sossego causing a higher efficiency in copper deposition in that site.
Starting Page	263
Ending Page	277
Page Count	15
File Format	PDF HTM / HTML
DOI	10.5327/rbg.v38i2.1376
Volume Number	38
Alternate Webpage(s)	http://www.ppegeo.igc.usp.br/index.php/rbg/article/download/7583/7010
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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