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• W2098361463 abstract "The 0.8-Moz Round Hill shear zone-hosted gold deposit is one of severallocated on, or near, the Hyde-Macraes shear zone, Macraes Flat, New Zealand.Field relationships show stockwork veins are the oldest part of the hydrothermalsystem, followed by flat and ramp veins. Hanging-wall shear veins formed earlybut have been modified by late deformation. Fluid inclusion microthermometric results for dominant type I inclusions showthat flat and ramp veins have the same average wt percent NaCl equiv values (2.2± 0.6%) and were precipitated from the same fluid. Salinity data for theseveins overlap with those from hanging-wall veins (average 1.3 ± 0.3%) andstockwork veins (1.6 ± 0.6% for vein margins; 0.9 ± 0.3% for vein centers),although both of the latter trend toward lower overall wt percent NaCl equivvalues, suggesting mixing between relatively dilute and more saline end members.All of the above veins have similar temperatures of homogenization (T h ),ranging between 110° and 188°C. Fluid inclusion trapping temperatures areconsidered to be ~300°C, equating to a ~10-km depth of formation. Carbondioxide dissolved in the hydrothermal fluid is responsible for up to one thirdof fluid inclusion apparent salinities. Stockwork and hanging-wall veins thushave true salinities of <1 wt percent NaCl equiv (<0.17 molal) and flatand ramp veins have true salinities of Fluid inclusion volatiles from Round Hill and other Macraes deposits aredominated by H 2 O (99.02–99.69 mol %), with lesser CO 2 (0.14–0.76 mol %), N 2 (0.03–0.32 mol %), and CH 4 (0.06–0.17mol %). Noticeable concentrations of hydrocarbons occur in many of the samples.Fluid inclusion cation and anion data show few components of relatively lowconcentration are dissolved in the hydrothermal fluid, consistent with CO 2 -correctedmicrothermometric measurements. A range in fluid inclusion δ D H 2 O values obtained for the Round Hill deposit is coincident with the different veintypes and also indicates mixing between two fluids. One fluid is considered tobe O isotope shifted meteoric water, as trapped by the early stockwork veins,and has the lowest δ D H 2 O values of –80 per mil. The other fluid is represented by flat and/or ramp andhanging-wall veins that have δ D H 2 O values up to –40 per mil. The Macraes δ D H 2 O data show a trend toward the magmatic water end member for geothermal systemsassociated with convergent plate boundaries and are consistent with a 25 to 50percent magmatic component in the Macraes hydrothermal system." @default.
• W2098361463 created "2016-06-24" @default.
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• W2098361463 date "2000-08-01" @default.
• W2098361463 modified "2023-09-23" @default.
• W2098361463 title "Round Hill Shear Zone-Hosted Gold Deposit, Macraes Flat, Otago,New Zealand: Evidence of a Magmatic Ore Fluid" @default.
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• W2098361463 doi "https://doi.org/10.2113/gsecongeo.95.5.1025" @default.
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