Geological And Shrimp Ii U-pb Constraints On The Age And Origin Of The Breves Cu-au-(w-bi-sn) Deposit, Carajás, Brazil

dc.creatorTallarico F.H.B.
dc.creatorMcNaughton N.J.
dc.creatorGroves D.I.
dc.creatorFletcher I.R.
dc.creatorFigueiredo B.R.
dc.creatorCarvalho J.B.
dc.creatorRego J.L.
dc.creatorNunes A.R.
dc.date2004
dc.date2015-06-26T14:22:51Z
dc.date2015-11-26T14:11:22Z
dc.date2015-06-26T14:22:51Z
dc.date2015-11-26T14:11:22Z
dc.date.accessioned2018-03-28T21:11:55Z
dc.date.available2018-03-28T21:11:55Z
dc.identifier
dc.identifierMineralium Deposita. , v. 39, n. 1, p. 68 - 86, 2004.
dc.identifier264598
dc.identifier10.1007/s00126-003-0383-y
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-1342289950&partnerID=40&md5=1f640fb59e713a4d0a727d9c401a6210
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/94045
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/94045
dc.identifier2-s2.0-1342289950
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1241713
dc.descriptionThe Breves deposit in the Carajás Copper-Gold Belt, Brazil, a member of the Cu-Au-(W-Bi-Sn) group of deposits, contains about 50 Mt of 1.22% Cu, 0.75 g/t Au, 2.4 g/t Ag, 1,200 g/t W, 70 g/t Sn, 175 g/t Mo and 75 g/t Bi. It is hosted by sandstones and siltstones of the Aguas Claras Formation (minimum age of 2,681 ± 5 Ma) in the roof zone of a complex, highly altered granite intrusion. The mineralisation is disseminated in a greisenized zone, resulting from alteration of probable monzogranites and syenogranites. The ore-bearing greisen contains abundant xenomorphic quartz in association with Fe-chlorite and muscovite. The gangue assemblage also includes fluorite, tourmaline, and minor amounts of monazite, xenotime, chlorapatite, thorite, zircon, calcite, siderite and bastnäesite. Copper mineralisation is dominated by chalcopyrite associated with pyrite, arsenopyrite, pyrrhotite and molybdenite. Gold particles, in equilibrium with native bismuth, are common as inclusions in chalcopyrite. The greisen contains sub-economic concentrations of tungsten and niobium that are related to the presence of ferberite, qitianlingite and Nb-rutile. SHRIMP II zircon dating of the host granites gives 207Pb/206Pb ages of 1,878 ± 8 and 1,880 ± 9 Ma for two phases, and a combined age of 1,879 ± 6 Ma. SHRIMP II dating of monazite and xenotime grains in late- to post-mineralisation veins gives a combined 207Pb/206Pb age of 1,872 ± 7 Ma, indistinguishable from the ages of the granites. This provides a genetic connection between the Breves deposit and the ca. 1.88 Ga A-type granite magmatism that typifies the Carajás Belt as part of a much larger, intracratonic magmatic province that extends over much of the Amazonian Craton. The recognition of this association has exploration implications, not only for the geophysical signature of the granite roof zones, but also for likely geochemical dispersion around the deposits of this type. © Springer-Verlag 2003.
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dc.titleGeological And Shrimp Ii U-pb Constraints On The Age And Origin Of The Breves Cu-au-(w-bi-sn) Deposit, Carajás, Brazil
dc.typeArtículos de revistas


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