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• W2034703277 abstract "Pregold mineralization at the Getchell Carlin-type gold deposit includesquartz and base metal vein mineralization associated with intrusion of aCretaceous granodiorite stock. The veins contain minor pyrite and tracechalcopyrite, arsenopyrite, galena, and sphalerite. The pyrite is moderatelycoarse and, in thin section, has high relief, is well polished, and is fracturedand locally cemented by the gold ore assemblage. White micas are associated withveins near the granodiorite intrusion. Gold was not observed or detected by fireassay analyses of samples or electron microprobe analyses of pyrites. Microprobeanalyses show that pregold pyrites have near-stoichiometric compositions.Variable, low arsenic is present in pyrite in samples overprinted by goldmineralization. Secondary ion mass spectrometry (SIMS) analyses detected tracegold in the coarse, near-stoichiometric pyrite in overprinted samples. Thepregold vein assemblage was fractured and cemented by gold ore-stagemineralization The gold ore-stage assemblage consists of gold- and arsenic-enriched pyriteand marcasite encompassed by jasperoid and drusy quartz, and local latefluorite, orpiment, and galkhaite. The consistent spatial association ofjasperoid and ore pyrite reflects their near-contemporaneous formation. The orepyrite occurs as either fine, irregularly shaped grains, or rims on earlier,gold-free pyrite. In thin section, the pyrite is visibly distinct and has a lowpolishing relief and a poor polish. SIMS and electron microprobe analyses showthat ore pyrites commonly contain 8 to 11 wt percent arsenic and as much as2,400 ppm gold. Near the end of the ore stage, fluorite, orpiment, and galkhaiteprecipitated locally in open space created by faulting or limestone dissolution. Late ore-stage mineralization consists dominantly of open space-fillingrealgar and calcite, with minor quartz, stibnite, and framboidal pyrite. Realgarconforms to euhedral crystal faces of ore-stage quartz, fluorite, and galkhaite.Calcite filled most remaining open space and conforms to euhedral crystal facesof quartz, fluorite, and realgar. Significant textural observations argue against an earlier interpretationthat the gold mineralization and arsenic minerals formed as two discrete eventsseparated by 40 m.y. In a few areas where calcite and realgar are in contactwith ore-stage quartz containing gold-bearing pyrite, realgar and calciteenclose gold-bearing pyrite grains. Massive realgar and calcite distal fromthese contacts do not contain the gold-bearing pyrite. The presence of orepyrite in realgar, calcite, and jasperoid requires close timing of theseminerals and shows that there is no major time break separating ore-stage andlate ore-stage mineral deposition. Textures indicate, instead, that the orestage and late ore stage formed as part of a single, evolving hydrothermalsystem. The consistent successive overgrowth of younger minerals on perfectlypreserved euhedral faces of older minerals supports the continuous evolution ofthe gold ore stage into the late ore stage. These results are consistent withfluid inclusions that indicate that paragenetically successive mineralsprecipitated from an aqueous ore fluid with consistent salinity and gas contentsbut at declining temperatures. Results show that, within error, the 34, 39, and42 Ma ages determined for fluorite and galkhaite at Getchell and adularia at thenearby Twin Creeks mine, respectively, most closely approximate the timing ofgold deposition at Getchell." @default.
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• W2034703277 date "2001-01-01" @default.
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• W2034703277 title "Timing of Gold and Arsenic Sulfide Mineral Deposition at the Getchell Carlin-Type Gold Deposit, North-Central Nevada" @default.
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• W2034703277 doi "https://doi.org/10.2113/gsecongeo.96.1.75" @default.
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