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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Native gold from volcanic gases at Tolbachik 1975-76 and 2012-13 Fissure Eruptions, Kamchatka
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Native gold from volcanic gases at Tolbachik 1975-76 and 2012-13 Fissure Eruptions, Kamchatka

机译:1975-76年和2012-13年堪察加半岛裂谷爆发时来自火山气体的原生金

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摘要

Aggregates and euhedral crystals of native gold were found in sublimates formed during New Tolbachik Fissure Eruption in 2012-2013 (NTFE). Gold-bearing sublimate samples were taken from a red-hot (690 degrees C) degassing fracture in the roof of an active lava tunnel 1.5 km from active Naboko cinder cone in May 2013. The gas condensate collected at 690 degrees C in this site contains 16 ppb Au, 190 ppb Ag and 1180 ppm Cu compared to 3 ppb Au, 39 ppb Ag and 9.7 ppm Cu in the condensate of pristine magmatic gas sampled at 1030 degrees C. The 690 degrees C volcanic gas is most likely a mix of magmatic gas and local snow buried under the lava flows as indicated by oxygen and hydrogen isotope compositions of the condensate. The lower-temperature gas enrichment in gold, copper and chlorine is resulted from evaporation of the 690 degrees C condensate during forced gas pumping at sampling. Native gold was also found in fumarolic encrustations collected from caverns in basalt lava flows with temperature up to 600 degrees C in June 2014, in a year after eruption finished.
机译:在2012年至2013年新托尔巴奇克裂隙爆发(NTFE)期间形成的升华物中发现了天然金的聚集体和全金属晶体。 2013年5月,从活动的Naboko煤渣锥1.5公里处的活动熔岩隧道顶上的炽热(690摄氏度)脱气裂缝中提取了含金升华样品。在该地点690摄氏度下收集的凝析气包含在1030摄氏度下采样的原始岩浆气体的冷凝物中,16 ppb Au,190 ppb Ag和1180 ppm Cu与3 ppb Au,39 ppb Ag和9.7 ppm Cu相比,690°C的火山岩气很可能是岩浆的混合物气体和埋在熔岩下的局部积雪以冷凝水的氧和氢同位素组成表示。金,铜和氯的低温气体富集是由于在采样时强制抽气过程中690摄氏度的冷凝液蒸发所致。在喷发完成后的一年,2014年6月,从温度高达600摄氏度的玄武岩熔岩流的洞穴中收集的富马壳中也发现了原生金。

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