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- W4256399217 abstract "The phosphorous-uranium deposit of Itataia, Ceará State, NE Brazil, is characterized by colophanites that occur as massive and irregular bodies, and as veins, associated to marbles and calc-silicate lenses that are enclosed in Meso to neoproterozoic pelitic and psamitic metasediments rocks metamorphosed under high amphibolite-facies. Centimetric to metric muscovite- and tourmaline-bearing pegmatitic bodies are common and crosscut both the metapelites and their anatetic products. Plagioclase-rich phyllosilicate-poor pegmatites cut different marble levels, some of which are mineralized in colophane. The marble beds, which are the main ore host-rock, show a heterogeneous structural pattern as a result of complex folding and thrusting. C and O isotope analyses in carbonates from one of the sections that crosscut partially mineralized metacarbonatic rocks show δ 13 C PDB values ranging from +2,0 to -5,0‰ and δ 18 O SMOW values from +16,3 to +24,2‰. Changes in the original isotopic ratios are mainly related to regional metamorphism, as well as to ductile and ductile-brittle post-depositional events associated with infiltration of hydrothermal and/or supergenic fluids and karstification. The thin, impure dolomitic marble bodies, which show the lowest isotopic ratios, were the most affected by these events. Retromorphic mylonitic levels and especially karstic dissolution breccias found at depths of 144m and inserted in the carbonatic levels are likely to represent fluid percolation channels. The thicker metacarbonatic levels, which show the highest δ 13 C PDB and δ 18 O SMOW ratios (0±2‰ and >20‰, respectively), represent isotopically best-preserved beds. The mineral assemblage (diopside, scapolite, phlogopite, clinochlore and tremolite) indicates that devolatization and/or decarbonation reactions did occur, but this does not preclude the hypothesis of external fluid interaction as responsible for the isotopic variation." @default.
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- W4256399217 date "2005-06-01" @default.
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- W4256399217 title "ISÓTOPOS DE CARBONO E OXIGÊNIO DOS MÁRMORES ASSOCIADOS COM O DEPÓSITO FÓSFORO URANÍFERO DE ITATAIA, CEARÁ" @default.
- W4256399217 doi "https://doi.org/10.25249/0375-7536.2005352199208" @default.
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