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The quartz syenite is characterized by the presence of microgranular enclaves Mes with granodioritic to quartz syenitic composition and is represented by microcline, edenite, pargasite, phlogopite, and minor diopside plagioclase and quartz. This Suite is also characterized by the presence of microgranular enclaves Mes and ultramafic dykes with sizes varying from centimeters to decimeters.
Some inherited zircons with Neo- to Paleoproterozoic ages are present. The main objective of these analyses was to stablish the distribution of the mineralizing elements e. The results point to gold related to sulfide phases of the Itajubatiba ore, which contradicts what one could infer from mining reports.
Nd isotope compositions of rocks from Uruana syenite 33 46 2.
Titanite, epidote, apatite and zircon represent accessory minerals. Both groups show a similar behavior when compared with the respective compositional field, except that they present a general stronger enrichment in LILE and LREE.
PIXE analyses of sulfides from representative samples of skarns and country rock of the Itajubatiba skarn deposit. Representative analyses of Amphiboles Table 3.
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This banding probably reflects the fact that the contacts between the skarn zones are not sharp, where the zones get to invade one another.
E Syn-magmatic intermediate to felsic dike. All the analyzed crystals belong to the calcic series with diopside to augite composition Figure 6. J Actinolite reaction rim of clinopyroxenes Figure 6. The Mes and the syn-magmatic dykes are metaluminous, showing high MgO 1.
The metasomatic columns from the original substrate towards the inner skarn for each skarn type can be summarized as follows: Fine to medium-grained ultramafic dikes, with thickeness up to 10 cm, are composed of phlogopite, diopside, and minor amphiboles.
Sometimes hornblende microphenocrysts are present, showing common biotite inclusions. Major elements and trace elements representative Harker diagrams for the Uruana syenite rocks Figure The Uruana syenite represents a complex intrusive composed by a main ellipsoidal body of quartz syenites with dimension of approximately 20x7 km to the west, an elongated body to the east and some peripheral stocks of alkali feldspar granites.
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The MEs exhibit similar or less LREE enrichment compared to compositional range of the quartz syenites, while Alkali feldspar syenite and syn-magmatic dikes display higher enrich compared to the range compositional of the host rock.
In this study, pyrite of the quartz-calcite vein shows the highest Pb 1, ppm and W 1, ppm concentrations, and a significant abundance of gold ppm. These groups have been compared with low-k and high-k calc-alkaline basalts Takahashi et al.
Sm and Nd samples were loaded onto Re filaments of a double filament assembly. The paragenesis of the Mes is represented by K-feldspar, amphibole, biotite and minor clinopyroxene, also plagioclase and quartz Figure 5D. From a total of twelve analyses carried out, these elements appeared in 7, 7, 8, 9, and 11 cases, respectively.
The olivine-bearing marble preferentially occurs around the skarns outer zoneand is composed of calcite, olivine, talc, hercynite, apatite, and allanite. Gold mineralization is typically later, associated with sulfides, which appear either filling veins crosscutting the skarns or disseminated throughout the skarns.
Xenocrists of K-feldspar from the host syenite are present Figure 5H.