Hydrothermal evolution of two stages of gold mineralization at the orogenic New Celebration gold deposit, and implications for gold mineralization within the Kalgoorlie-Kambalda Corridor, Eastern Goldfields Province, Western Australia

Joanna Hodge

    Research output: ThesisDoctoral Thesis

    2278 Downloads (Pure)

    Abstract

    [Truncated abstract] The Archean orogenic New Celebration gold deposit, located in the Kalgoorlie Terrane of the Eastern Goldfields Province, Western Australia, is hosted within the western segment of the first-order Boulder Lefroy fault zone (BLFZ). This setting contrasts with the majority of orogenic lode gold deposits worldwide, which are typically located in higher order splays, and as such, the New Celebration deposit provides a unique opportunity to study the hydrothermal, structural, alteration and fluid characteristics of a first-order crustal scale shear zone. Fluid inclusion, sulfur isotope and mineral chemistry were used to reconstruct the evolution of hydrothermal fluids within the BLFZ. Vein petrography, fluid inclusion microthermometry and laser ablation-inductively coupled plasma-mass spectrometry microanalysis (LA-ICP-MS) of single fluid inclusions, in addition to laser ablation sulfide sulfur isotope analyses and LA-ICP-MS mineral chemistry were combined to determine the pressure-temperaturecomposition evolution of the New Celebration gold deposit. At New Celebration, gold mineralization took place in two stages: Stage I, which is related to ductile, sinistral oblique slip fault movement and Stage II, which is related to brittle-ductile and brittle strike-slip fault movement. Type 2 quartz and quartzcalcite shear and extension veins concomitant with Stage I gold mineralization contain pseudo-secondary 2- and 3-phase aqueous-carbonic (10 ± 1 to 33 ± 13 mole % CO2) inclusions with salinities between 2 and 8 equiv. wt. percent NaCl, which were trapped between 330° and 390° C and 3.2 and 4.0 kbars.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Publication statusUnpublished - 2010

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