Artículos de revistas
Geochemistry Of Tourmalines Associated With Iron Formation And Quartz Veins Of The Morro Da Pedra Preta Formation, Serra Do Itaberaba Group (são Paulo, Brazil)
Registro en:
Anais Da Academia Brasileira De Ciencias. , v. 75, n. 2, p. 209 - 234, 2003.
13765
2-s2.0-0043263860
Autor
Garda G.M.
Beljavskis P.
Juliani C.
Silva D.
Institución
Resumen
Tourmalines of intermediate schorl-dravite composition occur in iron formation (including metachert and tourmalinites), metasediments, calc-silicate and metabasic/intermediate rocks of the Morro da Pedra Preta Formation, a volcanic-sedimentary sequence of the Serra do Itaberaba Group (northeast of São Paulo City, southeastern Brazil). The Morro da Pedra Preta Formation is crosscut by quartz veins that contain both intermediate schorl-dravite arid an alkali-deficient, Cr-(V-)bearing tourmaline, in which the occupancy of the X-site is □0.51Ca0.33Na0.15, characterizing it as intermediate to foitite and magnesiofoitite end-members. Mg# values for this tourmaline are higher than those for intermediate schorl-dravite. Raman spectroscopy also confirms the presence of two groups of tourmalines. Stable isotope data indicate sediment waters as fluid sources, rather than fluids from magmatic/post-magmatic sources. Delta18O compositions for tourmalines, host metachert, and quartz veins are similar, showing that fluid equilibration occurred during crystallization of both quartz and tourmaline. Syngenetic, intermediate schorl-dravite tourmalines were formed under submarine, sedimentary-exhalative conditions; amphibolite-grade metamorphism did not strongly affect their compositions. Younger tourmalines of compositions intermediate to foitite and magnesiofoitite reflect the composition of the host rocks of quartz veins, due to fluid percolation along faults and fractures that caused leaching of Cr (and V) and the crystallization of these alkali-deficient, Cr-(V-)bearing tourmalines. 75 2 209 234 Beljavskis, P., Juliani, C., Garda, G.M., Xavier, R.P., Bettencourt, J.S., Overview of the gold mineralization in the metavolcanic-sedimentary sequence of the Serra do Itaberaba Group-São Paulo-Brazil (1999) Mineral Deposits: Processes to Processing, 1, pp. 151-153. , STANLEY CJ ET AL. 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