Tourmaline, scheelite, and magnetite compositions from orogenic gold deposits and glacial sediments of the Val-d'Or district (Québec, Canada): Applications to mineral exploration

Grzela, Donald; Beaudoin, Georges; Bédard, Émilie

doi:10.1016/j.gexplo.2019.106355

Cited by 14 publications

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“…7; ESM 2 Fig. S9) were previously recognized in tourmaline from other types of mineral deposits and geological settings (Jiang et al 2002;Jiang et al 2004;Roberts et al 2006;Roda-Robles et al 2015;Harlaux 2016;Iveson et al 2016;Berryman et al 2017;Hazarika et al 2017;Kalliomäki et al 2017;Harlaux et al 2018;Manéglia et al 2018;Wang et al 2018;Grzela et al 2019), and thus are not discriminant of deposit types or geological environments.…”

Section: Rare Earth Elementsmentioning

confidence: 95%

“…Partial Least Square-DA includes tourmaline data with the same set of compositional data from the Val-d'Or (Grzela et al 2019) and Meliadine (Manéglia et al 2018) gold districts . LA-ICP-MS results for major, minor and trace elements were classified by country rock composition, simplified as the main country rock type (Table 1; Fig.…”

Section: Multi-variate Analysis Of Tourmaline Composition In Relationmentioning

confidence: 99%

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Chemical composition of tourmaline in orogenic gold deposits

2020

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Tourmaline from eighteen orogenic gold deposits and districts, hosted in varied country rocks and metamorphic facies, was investigated by EPMA (Electron Probe Micro-Analyzer) and LA-ICP-MS (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry) to establish discriminant geochemical features to constrain indicator mineral surveys for gold exploration. Such tourmaline most commonly belongs to the alkali group, with a dravitic composition. LA-ICP-MS results were investigated with binary plots and PLS-DA (Partial Least Square-Discriminant Analysis). PLS-DA suggests that the major element composition of tourmaline from orogenic gold deposits is buffered by the hydrothermal fluid, whereas trace element composition is strongly controlled by the composition and the metamorphic facies of the country rocks. Contents of Sn, Ga, Ti, Rare Earth Elements (REE), Zr, Hf, Nb, Ta, Th and U vary with the metamorphic facies of the country rocks. Tourmaline from orogenic gold deposits has high contents of Sr, V, and Ni and low Li, Be, Ga, Sn, Nb, Ta, U, and Th compared to tourmaline from other deposit types and geological environments. Binary plots such as Sr/Li vs. V/Sn, Sr/Sn vs. V/Nb, Sr/Sn vs. Ni/Nb and Sr/Sn vs. V/Be, as well as PLS-DA, discriminate tourmaline from orogenic gold deposits from that of other settings. Binary plots highlight a transitional variation in the trace element composition of tourmaline from metamorphic, to magmatic-hydrothermal, to magmatic environments.

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