Matches in SemOpenAlex for { <https://semopenalex.org/work/W2804285874> ?p ?o ?g. }
- W2804285874 endingPage "27" @default.
- W2804285874 startingPage "1" @default.
- W2804285874 abstract "Textural, chemical and multiple sulfur isotope analyses of sulfides from the Archean world-class Cuiabá orogenic Au deposit, Quadrilátero Ferrífero district, Brazil, were conducted to track distinct trace element signatures from syngenetic to epigenetic-hydrothermal pyrite types in different host units, and to deduce the nature and source of the mineralizing fluids. Gold mineralization in Cuiabá is hosted in greenschist facies volcanic and sedimentary host rocks belonging to the Archean Rio das Velhas Supergroup, especially in association with quartz veins and sulfide minerals. The BIF-hosted Fonte Grande Sul orebody is controlled by quartz veins and disseminated gold-bearing pyrite, pyrrhotite and arsenopyrite in the wall rocks. Five pyrite types are classified based on textural relations as spongy, syngenetic (Py1), porous early-(Py2), smooth main-(Py3) and smooth isolated and overgrown late-stage (Py4 and Py5) types variably present in metamorphosed carbonaceous pelites, BIF and andesite. Besides pyrite, pyrrhotite and arsenopyrite are also defined according to textural and paragenetic differences, and they display significant trace element contents. Trace element abundance maps and LA-ICP-MS analyses display trace element incorporations in Py1 (present only in carbonaceous pelite), Py2 and Py3 (in all host rocks), and Py4 and Py5 (only in BIF). Py1 yields high As, Co, Ni, Pb and Ag concentrations, whereas Py2 (formed by agglomeration of Py1) maintains high trace element concentrations with slightly less of those elements. Trace element incorporation in Py3 is similar to Py1 in carbonaceous pelite. Early-stage Py2 and main-stage Py3 in BIF and andesite have increased Co and Ni, but have less Au and As. Late-stage Py4 is characterized by lower trace element concentrations, whereas Py5 is further enriched in As, Bi, Co, Ni and Pb. The hydrothermal alteration is divided into early-, main- and late-stage, which correlate to the sulfide hydrothermal evolution. The study shows that carbonaceous pelite is pre-enriched in Co, Ni and Pb, whereas certain elements like Ag, Au, Bi and As are only hydrothermally concentrated either during the early, main or late stage in BIF and andesite. This geochemical pattern supports a syngenetic versus hydrothermal origin of distinct elements, including some trace elements now in the ore zones. Multiple sulfur isotope data suggest that mineralizing fluids at the Cuiabá gold deposit reflect a complex mixing of sulfur evolved from three possible sources: seawater, mantle, and reduced elemental sulfur. Spongy, syngenetic Py1 yields Δ33S values ranging from −2.28 to −0.25‰, separated into two ranges, the first from −2.28 to −1.97‰, and the second from −0.96 to −0.25‰. The first range suggests Py1 in the carbonaceous pelite was deposited in a seawater environment. These pyrites probably mixed with later mantle sulfur carrying a near-zero Δ33S signature, which is indicated by the second Δ33S range, or could have mixed with fluids sourced from sedimentary rocks at depth carrying a positive Δ33S signature. The second scenario is more common in sedimentary and diagenetic pyrites. An unequivocal contrast is shown by early-, main- and late-stage pyrite types (Py2, Py3, Py4 and Py5) in carbonaceous pelite, BIF and andesite, which present a continuous process of crustal assimilation values towards increasingly positive δ34S and Δ33S values. This confirms evidence for a sedimentary-derived sulfur source as also indicated by fluid inclusion data of the andesite-hosted orebody at the Cuiabá deposit." @default.
- W2804285874 created "2018-06-01" @default.
- W2804285874 creator A5034525997 @default.
- W2804285874 creator A5049853842 @default.
- W2804285874 creator A5053793226 @default.
- W2804285874 creator A5087327487 @default.
- W2804285874 date "2018-07-01" @default.
- W2804285874 modified "2023-09-24" @default.
- W2804285874 title "Sulfur isotope and metal variations in sulfides in the BIF-hosted orogenic Cuiabá gold deposit, Brazil: Implications for the hydrothermal fluid evolution" @default.
- W2804285874 cites W1559512232 @default.
- W2804285874 cites W1934361153 @default.
- W2804285874 cites W1938264244 @default.
- W2804285874 cites W1950990707 @default.
- W2804285874 cites W1965744338 @default.
- W2804285874 cites W1965759444 @default.
- W2804285874 cites W1969023317 @default.
- W2804285874 cites W1969185546 @default.
- W2804285874 cites W1969598356 @default.
- W2804285874 cites W1969725957 @default.
- W2804285874 cites W1972748437 @default.
- W2804285874 cites W1978220484 @default.
- W2804285874 cites W1984773925 @default.
- W2804285874 cites W1986182589 @default.
- W2804285874 cites W1988435801 @default.
- W2804285874 cites W2002033847 @default.
- W2804285874 cites W2003898863 @default.
- W2804285874 cites W2003900197 @default.
- W2804285874 cites W2009509387 @default.
- W2804285874 cites W2011001616 @default.
- W2804285874 cites W2011826055 @default.
- W2804285874 cites W2015537716 @default.
- W2804285874 cites W2016338929 @default.
- W2804285874 cites W2018093298 @default.
- W2804285874 cites W2025624557 @default.
- W2804285874 cites W2030026706 @default.
- W2804285874 cites W2030142331 @default.
- W2804285874 cites W2033865324 @default.
- W2804285874 cites W2037930171 @default.
- W2804285874 cites W2040843168 @default.
- W2804285874 cites W2051323905 @default.
- W2804285874 cites W2052216307 @default.
- W2804285874 cites W2057275258 @default.
- W2804285874 cites W2057391595 @default.
- W2804285874 cites W2061590669 @default.
- W2804285874 cites W2065313259 @default.
- W2804285874 cites W2071510629 @default.
- W2804285874 cites W2074064282 @default.
- W2804285874 cites W2075071049 @default.
- W2804285874 cites W2075901285 @default.
- W2804285874 cites W2077266669 @default.
- W2804285874 cites W2078811057 @default.
- W2804285874 cites W2081383679 @default.
- W2804285874 cites W2082740169 @default.
- W2804285874 cites W2085584984 @default.
- W2804285874 cites W2085961199 @default.
- W2804285874 cites W2090721051 @default.
- W2804285874 cites W2091008334 @default.
- W2804285874 cites W2091167370 @default.
- W2804285874 cites W2092155943 @default.
- W2804285874 cites W2099059310 @default.
- W2804285874 cites W2100191999 @default.
- W2804285874 cites W2100767171 @default.
- W2804285874 cites W2105081764 @default.
- W2804285874 cites W2107518652 @default.
- W2804285874 cites W2108740208 @default.
- W2804285874 cites W2117487549 @default.
- W2804285874 cites W2125657836 @default.
- W2804285874 cites W2130626244 @default.
- W2804285874 cites W2134179846 @default.
- W2804285874 cites W2136617541 @default.
- W2804285874 cites W2139770286 @default.
- W2804285874 cites W2153000470 @default.
- W2804285874 cites W2153184548 @default.
- W2804285874 cites W2153952174 @default.
- W2804285874 cites W2154295153 @default.
- W2804285874 cites W2154499471 @default.
- W2804285874 cites W2154506653 @default.
- W2804285874 cites W2161790785 @default.
- W2804285874 cites W2168520570 @default.
- W2804285874 cites W2209657837 @default.
- W2804285874 cites W2220964083 @default.
- W2804285874 cites W2296709564 @default.
- W2804285874 cites W2344382649 @default.
- W2804285874 cites W2381503944 @default.
- W2804285874 cites W2395028018 @default.
- W2804285874 cites W2437646202 @default.
- W2804285874 cites W2521024089 @default.
- W2804285874 cites W2526550853 @default.
- W2804285874 cites W2528686176 @default.
- W2804285874 cites W2553646013 @default.
- W2804285874 cites W2585140187 @default.
- W2804285874 cites W2593160454 @default.
- W2804285874 cites W2594999869 @default.
- W2804285874 cites W2598775425 @default.
- W2804285874 cites W2740020884 @default.
- W2804285874 cites W2791959172 @default.
- W2804285874 cites W353521585 @default.
- W2804285874 cites W4243938036 @default.