Please use this identifier to cite or link to this item: https://rigeo.cprm.gov.br/handle/doc/481
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dc.contributor.authorKLEIN, Evandro Luiz
dc.contributor.authorLAFON, Jean-Michel
dc.contributor.authorBRITO, Reinaldo S.C.
dc.contributor.authorVASCONCELOS, Paulo
dc.date.accessioned2013-12-19T16:30:36Z
dc.date.available2013-12-19T16:30:36Z
dc.date.issued2009
dc.identifier.citationKLEIN, Evandro Luiz; LAFON, Jean-Michel; BRITO, Reinaldo S.C.; VASCONCELOS, Paulo. Fluid inclusion and isotopic constraints on the genesis of vein-quartz gold deposits of the Ipitinga Auriferous District, SE-Guyana Shield, Brazil. In: REIS, N.J.; MONTEIRO, M.A.S. Contribuições à Geologia da Amazônia. Belém: SBG. Núcleo Norte, 2009. p. 19-38.
dc.identifier.urihttps://rigeo.cprm.gov.br/handle/doc/481
dc.descriptionPanorama do conhecimento geológico do X Simpósio de Geologia da Amazônia, realizado em Porto Velho, Rondônia, no período de 11 a 15 de novembro de 2007. Autoria da Obra: KLEIN, Evandro Luiz; LAFON, Jean-Michel; BRITO, Reinaldo S.C.; VASCONCELOS, Paulo
dc.description.abstractThe Ipitinga Auriferous District (SE-Guyana Shield, NW-Pará state) contains vein-quartz gold occurrences hosted in Paleoproterozoic metavolcano-sedimentary sequences and associated granitoids, especially near the contact between the granitoids and the supracrustal rocks. The structurally-controlled deposits are hosted in ductile shear zones and in foliation planes of the host rocks, have sericitization as the main important proximal alteration, and have small amounts of sulfi de minerals in the ore paragenesis. Fluid inclusion types and properties are similar in most of the deposits. The aqueous-carbonic inclusions, with small to moderate amounts of CH4 (locally C2H6) are the predominant types. These inclusions have low salinity (~5 wt. % NaCl equiv.) and homogenized between 290° and 355°C. Carará differs from this pattern in that it shows only water-free CO2-bearing inclusions, the origin of which is still uncertain. Oxygen and hydrogen isotope compositions overlap the fields of magmatic and metamorphic waters, except at Carará that clearly shows a metamorphic source for the hydrothermal fl uid. Integrated geologic characteristics, and fl uid inclusion and isotopic results are consistent with the class of orogenic gold deposits. The characteristics reported in the literature for the Serra do Ipitinga Au occurrence strongly differs from those presented by the studied deposits in the district and probably belong to another class of deposit. Pb-Pb and 40Ar-39Ar systematics have not succeed in determining the age of the mineralizing event in the Ipitinga Auriferous District, but bracketed a time window for mineralization between 1940 and 2030 Ma
dc.language.isoenen
dc.publisherSBG. Núcleo Norte
dc.subjectGEOLOGIA
dc.subjectINCLUSÕES FLUÍDAS
dc.subjectQUARTZOS HOSPEDADOS
dc.subjectROCHAS VULCANOSSEDIMENTARES
dc.subjectOURO
dc.subjectISÓTOPOS
dc.subjectCRÁTON AMAZÔNICO
dc.subjectBRASIL
dc.subjectAMAZÔNIA
dc.titleFluid inclusion and isotopic constraints on the genesis of vein-quartz gold deposits of the Ipitinga Auriferous District, SE-Guyana Shield, Brazil
dc.typeBook chapterpt_BR
dc.localBelém
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