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• W2037060025 abstract "Petrologic and geochemical features enabled us to constrain the petrogenesis of dikes spatially associated with the Golden Revenue (GR) Au–Cu and the Stoddart Mo–Cu ± W mineralization, in the Mountain Freegold, Yukon Territory, Canada. Both dike sets are aplitic and porphyritic and characterized by broken and embayed feldspar and quartz phenocrysts/phenoclasts set in a fine-grained groundmass. In both GR and Stoddart mineralized zones, aplitic dikes are typically related to the lower T magma relative to the porphyritic dikes, as indicated by zircon and apatite saturation temperatures. GR dikes are essentially dacitic to rhyolitic in compositions, whereas dikes from Stoddart display a wide compositional range spanning from basaltic–andesitic to rhyolitic compositions. GR and Stoddart dike suites are classified as high-K calc–alkaline units and exhibit adakitic affinities with their depletion in HREE + Y relative to LREE and subsequently high Sr/Y and La/Yb ratios. Dikes associated with the Stoddart Mo–Cu ± W mineral occurrence are oxidized (as suggested by the elevated XMg of biotite and hornblende, and magnetic susceptibility data) relative to dikes associated with Au–Cu mineralization, and the former were fed by a high-level magma chamber, whereas the latter are associated with a deep-seated magma chamber. 87Sr/86Sri values from GR and Stoddart dikes are near equal (0.7052–0.7083 and 0.7054–0.7076, respectively), and the εNdi of both dike suites is equal as well (− 0.1). While Pb isotope compositions of GR dikes are heterogeneous and span a wide composition range (206Pb/204Pbi: 18.823–19.577; 207Pb/204Pbi: 15.593–15.681, and 208Pb/204Pbi: 38.539–39.017), by contrast dikes from Stoddart yielded relatively homogeneous Pb isotope compositions (206Pb/204Pbi: 19.103–19.389; 207Pb/204Pbi: 15.606–15.667, and 208Pb/204Pbi: 38.672 to 38.99). The difference in fO2 and in isotope compositions, as well as in the depth of magma emplacement between the two dike sets indicates magma derived from different sources, and it is suggested that those differences further controlled the variation in styles of mineralization. The preservation of petrographic features, such as miarolitic cavities, quartz phenocrysts and phenoclasts, and the presence of intermineral porphyry dikes suggest a close temporal relationship between dike emplacement and the hydrothermal activity, thus consistent with the magmatic–hydrothermal transition." @default.
• W2037060025 created "2016-06-24" @default.
• W2037060025 creator A5044404954 @default.
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• W2037060025 date "2011-06-01" @default.
• W2037060025 modified "2023-10-02" @default.
• W2037060025 title "Petrochemistry of subvolcanic dike swarms associated with the Golden Revenue Au–Cu and the Stoddart Mo–Cu±W mineralizations (Dawson Range, Yukon Territory, Canada) and implications for ore genesis" @default.
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• W2037060025 doi "https://doi.org/10.1016/j.oregeorev.2011.01.003" @default.
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