A ProvÃncia AurÃfera TapajÃ³s-Xingu: AvanÃ§os no ... - ADIMB

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THE UATUMÃ MAGMATISMIncludes calc-alkaline and alkaline granites and volcanic rocks with agesranging from ~2,0 to 1,75 Ga.These unit covers more than 1.200.000 km 2 (Santos et al. 2000), which isapproximately 30% of the Amazonian craton, excluding the PhanerozoicAmazon River basin.The original volcanic area could have reached 2.000.000 km 2Many areas where volcanic rocks outcrop are not identified in geologicmaps, even in more recent workThe largest felsic province of the world
THE UATUMÃ SUPERGRUP INCLUDES:Alkaline A type granites named Maloquinha Intrusive Suite in the Tapajós(Almeida et al. 1977, Andrade et al. 1978), Mapuera at north of Rio Amazonasbasin (Oliveira et al. 1975) and Velho Guilherme Intrusive Suite in the Xinguregion (Macambira & Vale 1997).However, the calc-alkaline affiliation of the basal volcanic units of theUatumã doesn’t favour such interpretation. Thus, the Uatumã volcanismgenerated in an continental magmatic arc may be likely related to the Parauariplutonism. But, outher older and younger calc-alkaline could be present inTapajós – Xingu orogenic beltThe type A granites possibly are genetically related with the alkaline volcanicunit.THIS IMPLIES IN AT LEAST TWO PALEOPROTEROZOIC VOLCANIC SEQUENCES:CALK-ALKALINE (LOWER) AND A-TYPE ALKALINE (UPPER)
Page 1 and 2: A Província Aurífera Tapajós-Xin
Page 6: 1.9 - 1.86 MAGMATIC-HYDROTHERMAL MI
Page 9: Schematic stratigraphy of the Tapaj
Page 12 and 13: Au high-sulfidationmineralizationCu
Page 14 and 15: Schematic cross-section of the high
Page 16 and 17: AluniteJuliani et al. (2005)Paleopr
Page 18 and 19: Pyrite sulfur isotopeTapajós HS: -
Page 20 and 21: The low-sulfidation (adularia-seric
Page 22 and 23: Stratigraphy of volcanicrocks and p
Page 24 and 25: Rhyolites strongly affected by adul
Page 26 and 27: Quartz and sulfide veins in strongl
Page 30: Xingu areaLagler (2011)Juliani & Fe
Page 33 and 34: Ash tuffSpherulitesMarine calciaren
Page 36 and 37: Tapajós - XinguPearce et al. (1984
Page 40 and 41: The Palito Granite1.89 Ga Au-(Cu) p
Page 42 and 43: GEOCHEMISTRYHarris et al. (1986) Sc
Page 44 and 45: Palito Alkali-calcic g ran ite(a d
Page 50 and 51: CpyGa + SpCpyGa + Sp + Cpy
Page 53 and 54:
Mineral Chemical formula Mineral Ch
Page 55 and 56:
Hydrogen Isotopic compositionMinera
Page 57:
FLUID INCLUSION STUDYUsero et al. (
Page 65 and 66:
Fig. 2.5 Reconstruction of cratons
Page 67:
Carneiro et al. - See the poster ex
Page 73:
Volcanic coverANP
Page 84:
LS + Por(Cu+Mo+(Au)HS (Au)??Por (Au
Page 89:
AcknowlegmentsWe are greatly indebt
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