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• W2030139888 abstract "Scanning electron microscope cathodoluminescence imaging is used to map successive generations of fluid inclusions in texturally complex quartz veinlets representing the main stage of ore metal introduction into the porphyry Cu–Au–Mo deposit at Bingham, Utah. Following conventional fluid inclusion microthermometry, laser ablation–inductively coupled plasma–mass spectrometry (LA-ICPMS) is applied to quantify copper and other major and trace-element concentrations in the evolving fluid, with the aim of identifying the ore-forming processes. Textures visible in cathodoluminescence consistently show that the bulk of vein quartz (Q1), characterized by bright luminescence, crystallized early in the vein history. Cu–Fe-sulfides are precipitated later in these veins, in a microfracture network finally filled with a second generation of dull-luminescing Q2 quartz. Mapping of brine and vapor inclusion assemblages in these successive quartz generations in combination with LA-ICPMS microanalysis shows that the fluids trapped before and after Cu–Fe-sulfide precipitation are very similar with respect to their major and minor-element composition, except for copper. Copper concentrations in inclusions associated with ore formation drop by two orders of magnitude, in a tight pressure–temperature interval between 21 and 14 MPa and 425–350 °C, several hundred degrees below the temperature of fluid exsolution from the magma. Copper deposition occurs within a limited P–T region, in which sulfide solubility shows strong normal temperature dependence while quartz solubility is retrograde. This permits copper sulfide deposition while secondary vein permeability is generated by quartz dissolution. The brittle-to-ductile transition of the quartz–feldspar-rich host rocks occurs in the same temperature range, which further enhances vein reactivation and promotes cooling and expansion of fluids ascending across the transition from lithostatic to hydrostatic conditions." @default.
• W2030139888 created "2016-06-24" @default.
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• W2030139888 date "2005-06-30" @default.
• W2030139888 modified "2023-10-11" @default.
• W2030139888 title "Copper deposition during quartz dissolution by cooling magmatic–hydrothermal fluids: The Bingham porphyry" @default.
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• W2030139888 doi "https://doi.org/10.1016/j.epsl.2005.02.046" @default.
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