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Precious Metal Enrichment at the Myra Falls VMS Deposit, British Columbia, Canada

机译：加拿大不列颠哥伦比亚省Myra Falls VMS矿床中的贵金属富集

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Gold, present as electrum, in the Battle Gap, Ridge North-West, HW, and Price deposits at the Myra Falls mine, occurs in late veinlets cutting the earlier volcanogenic massive sulphide (VMS) lithologies. The ore mineral assemblage containing the electrum comprises dominantly galena, tennantite, bornite, sphalerite, chalcopyrite, pyrite, and rarely stromeyerite, and is defined as an Au-Zn-Pb-As-Sb association. The gangue is comprised of barite, quartz, and minor feldspathic volcanogenic sedimentary rocks and clay, comprised predominantly of kaolinite with subordinate illite. The deposition of gold as electrum in the baritic upper portions of the sulphide lenses occurs at relatively shallow water depths beneath the sea floor. Primary, pseudosecondary, and secondary fluid inclusions, petrographically related to gold, show boiling fluid inclusion assemblages in the range of 123 to 173 °C, with compositions and eutectic melt temperatures consistent with seawater at approximately 3.2 wt % NaCl equivalent. The fluid inclusion homogenization temperatures are consistent with boiling seawater corresponding to water depths ranging from 15 to 125 m. Slightly more dilute brines corresponding to salinities of approximately 1 wt % NaCl indicate that there is input from very low-salinity brines, which could represent a transition from subaqueous VMS to epithermal-like conditions for precious metal enrichment, mixing with re-condensed vapor, or very low-salinity igneous fluids.
机译：黄金，作为矿物质存在于迈拉瀑布矿山的战缝隙，西北山脊，硬件和普莱斯矿床中，出现在晚期的小脉中，切割了较早的火山成因的大块硫化物（VMS）岩性。包含电子的矿石矿物组合物主要包括方铅矿，球铁矿，褐铁矿，闪锌矿，黄铜矿，黄铁矿和极少量的辉锰矿，并被定义为Au-Zn-Pb-As-Sb缔合体。脉石由重晶石，石英，长石质火山沉积岩和黏土组成，主要由高岭石和次要伊利石组成。在硫化物晶状体的上部，金作为电子沉积在海床以下相对较浅的水深处。岩石学上与金有关的一次，二次和二次流体包裹体显示沸腾的流体包裹体组合在123至173°C的范围内，其组成和低共熔熔体温度与海水一致，NaCl当量约为3.2 wt％。流体夹杂物的均质温度与沸腾的海水一致，对应于15至125 m的水深。盐度大约为1 wt％的NaCl的稀盐水略多，这表明盐度非常低的盐水有输入，这可能表示从水下VMS到类似超热条件的富金属富集过渡，再与再冷凝的蒸气混合，或盐度极低的火成流体。

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