dc.creatorTorresi I.
dc.creatorXavier R.P.
dc.creatorBortholoto D.F.A.
dc.creatorMonteiro L.V.S.
dc.date2012
dc.date2015-06-25T20:24:58Z
dc.date2015-11-26T15:20:51Z
dc.date2015-06-25T20:24:58Z
dc.date2015-11-26T15:20:51Z
dc.date.accessioned2018-03-28T22:30:22Z
dc.date.available2018-03-28T22:30:22Z
dc.identifier
dc.identifierMineralium Deposita. , v. 47, n. 3, p. 299 - 323, 2012.
dc.identifier264598
dc.identifier10.1007/s00126-011-0373-4
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84857686167&partnerID=40&md5=6e738ccd7cd9972d2ec29979a82d88f8
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/90348
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/90348
dc.identifier2-s2.0-84857686167
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1260085
dc.descriptionThe Alvo 118 iron oxide-copper-gold (IOCG) deposit (170 Mt at 1. 0 wt.% Cu, 0. 3 g/t Au) lies in the southern sector of the Itacaúnas Shear Belt, Carajás Mineral Province, along a WNW-ESE-striking, 60-km-long shear zone, close to the contact of the ~2. 76-Ga metavolcano-sedimentary Itacaiúnas Supergroup and the basement (~3. 0 Ga Xingu Complex). The Alvo 118 deposit is hosted by mafic and felsic metavolcanic rocks and crosscutting granitoid and gabbro intrusions that have been subjected to the following hydrothermal alteration sequence towards the ore zones: (1) poorly developed sodic alteration (albite and scapolite); (2) potassic alteration (biotite or K-feldspar) accompanied by magnetite formation and silicification; (3) widespread, pervasive chlorite alteration spatially associated with quartz-carbonate-sulphide infill ore breccia and vein stockworks; and (4) local post-ore quartz-sericite alteration. The ore assemblage is dominated by chalcopyrite (~60%), bornite (~10%), hematite (~20%), magnetite (10%) and subordinate chalcocite, native gold, Au-Ag tellurides, galena, cassiterite, F-rich apatite, xenotime, monazite, britholite-(Y) and a gadolinite-group mineral. Fluid inclusion studies in quartz point to a fluid regime composed of two distinct fluid types that may have probably coexisted within the timeframe of the Cu-Au mineralizing episode: a hot (>200°C) saline (32. 8‰ to 40. 6 wt.% NaCl eq.) solution, represented by salt-bearing aqueous inclusions, and a lower temperature (<200°C), low to intermediate salinity (<15 wt.% NaCl eq.) aqueous fluid defined by two-phase (L H2O + V H2O) fluid inclusions. This trend is very similar to those defined for other IOCG systems of the Carajás Mineral Province. δ 18O H2O values in equilibrium with calcite (-1. 0‰ to 7. 5‰ at 277°C to 344°C) overlap the lower range for primary magmatic waters, but the more 18O-depleted values also point to the involvement of externally derived fluids, possibly of meteoric origin. Furthermore, sulphide δ 34S values (5. 1‰ to 6. 3‰), together with available boron isotope and Cl/Br-Na/Cl data provide evidence for a significant component of residual evaporative fluids (e. g., bittern fluids generated by seawater evaporation) in this scenario that, together with magma-derived brines, would be the main sources of the highly saline fluids involved in the formation Alvo 118 IOCG deposit. The restricted high temperature sodic alteration, the pervasive overprinting of the potassic alteration minerals by chlorite proximal to the ore zones, ore breccias with open-space filling textures in brittle structures, microthermometric and stable isotope data indicate, collectively, that the Alvo 118 IOCG system developed at structurally high levels and may be considered the shallower representative of the IOCG systems of the CMP. © 2011 Springer-Verlag.
dc.description47
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dc.description299
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dc.descriptionZuchetti, M., (2007) Rochas máficas do grupo Grão Pará e sua relação com a mineralização de ferro dos depósitos N4 e N5, Carajás, PA, p. 165. , PhD thesis, Universidade Federal de Minas Gerais
dc.languageen
dc.publisher
dc.relationMineralium Deposita
dc.rightsfechado
dc.sourceScopus
dc.titleHydrothermal Alteration, Fluid Inclusions And Stable Isotope Systematics Of The Alvo 118 Iron Oxide-copper-gold Deposit, Carajás Mineral Province (brazil): Implications For Ore Genesis
dc.typeArtículos de revistas


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