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• W934053488 abstract "SUMMARYThe alteration zone underlying Hellyer is larger in size and extent than commonly reported for volcanogenic massive sulphide deposits and has consistent alteration mineral zonation with Archean deposits and deposits hosted in mafic volcanics. Alteration within the siliceous core of the feeder system consists of intensive silicification down to a depth of 350 m below the massive sulphide. The silicification is underlain by chloritic alteration to the known extent of the alteration system (555 m).Eight stages of veining have been determined in the alteration zone, these include one stage of pre-mineralisation, three stages of syn-mineralisation, and four stages of post-mineralisation veining. The mostabundant veins are related to the mineralising processesand contain significant quantities of base-metal and ironsulphides. The identification of the syn-mineralisationveins within areas of intense alteration is a goodexploration target.An analysis of metal zoning in the stringer zoneindicates the presence of three feeder systems withinthe alteration pipe. The central feeder is located in themiddle of the deposit (10720 N/l0850 N) with a secondfeeder system to the south (l0500N) and a third feedersystem is weakly developed under the far northernportion of the ore body (10950N). The alignment of thethree hydrothermal systems under the massive sulphidesis not related to the Jack fault and may be of significancefor regional exploration.Fluid inclusion measurements indicate that the fluid responsible for the formation of the syn-mineralisationveining are consistently of high temperature (280-350°C) but of varying salinity. Stage 2A quartz-pyrite-carbonate veins have high salinities (12 - 24 equiv. wt % NaCI) while Stage 2B base-metal-rich sulphide veins have very low salinities (<3 equiv. wt % NaCI). The high temperature-low salinity data are similar to the stockwork siliceous ores of the Kuroko deposits.Carbon and oxygen isotope analyses of carbonate minerals reveal slight differences between the various vein stages and the chlorite-carbonate alteration, but these differences are minor. The carbon and oxygen data suggests, even though there are differences in thetime of precipitation of carbonates in the various syn- andpost-mineralisation veins and the chlorite-carbonatealteration, a similar source (seawater or modifiedseawater) for both the carbon and oxygen in carbonateminerals throughout the Hellyer stringer system." @default.
• W934053488 created "2016-06-24" @default.
• W934053488 creator A5063867251 @default.
• W934053488 date "1988-12-01" @default.
• W934053488 modified "2023-09-23" @default.
• W934053488 title "Hellyer Stringer Zone Project.Progress Report No. 1(CODES publication 17)" @default.
• W934053488 hasPublicationYear "1988" @default.
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