英语翻译Hot Spring Gold Mineralization Mineralized hydrothermal

英语翻译
Hot Spring Gold Mineralization
Mineralized hydrothermal vent breccias are presen in all of the hot spring gold deposits recognized to date.However,not all hot spring systems with hydrothermal eruption breccias contain shallow gold mineralization.This section explores the variousmechanisms by which hydrothermal eruptions might lead to the formation of a hot spring gold orebody.
Shallow gold mineralization occurs in permeable hydrothermal vent breccias and peripheral fractured stockworks that developed in the vicinity of an outflow conduit.Mineralization appears to have taken place when gold-bearing geothermal fluids flood this zone,a period described as the "prograde regime" by Blakestad and Stanley (1984).Such periods are characterized by high heat flow,high vertical fluid flow rates,and large volumes of focused fluid throughput Focused fluid throughput refers to the channeling of fluid discharge in an active geothermal system throug zones of high permeability.Permeable fluid conduit in active geothermal fields (e.g.,Waiotapu,New Zea land) include hydrothermal vent breccias and zone of open or closely spaced fracturing.Ellis (1979 ）summarizes evidence suggesting that periods of high fluid throughput are brief,on the order of thousands of years,relative to the lifespan of typical geothermal systems which is hundreds of thousands to several million years.
Such elevated gold concentrations in solution imply a combination of source rock and geothermal reservoi chemistry conducive to gold mobilization.Charac teristics of gold source rocks are discussed by Keays and Scott (1976) and Keays (1984),who point out that gold accessibility to solution transport depends on total gold content,mineralogical siting,timing of gold liberation,metamorphic and deformational his-
tory,and bulk chemical composition of the source rock.A good gold source contains an anomalou amount of accessible gold but may not be particularly anomalous in terms of its absolute gold content.
Gold solubility as a function of solution chemistry has been treated in a number of studies since the pioneering work of Henley (1973) and Seward (1973).
Results to date indicate that gold solubility in geothermal reservoirs at 100 ø to 300øC is enhanced by high temperature,reducing Eh,and neutral to alkaline pH.
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Hot Spring Gold Mineralization
Mineralized hydrothermal vent breccias are present in all of the hot spring gold deposits recognized to date.However,not all hot spring systems with hydrothermal eruption breccias contain shallow gold mineralization.This section explores the various mechanisms by which hydrothermal eruptions might lead to the formation of a hot spring gold ore body.
温泉黄金矿化
目前所有确认的温泉金矿床都有矿化的热液喷口角砾岩的存在.然而,不是所有拥有热液喷发角砾岩的温泉系统都包含浅层黄金的矿化.本章节探讨可能形成温泉金矿体的热液喷发的各种机理.
Shallow gold mineralization occurs in permeable hydrothermal vent breccias and peripheral fractured stock works that developed in the vicinity of an outflow conduit.Mineralization appears to have taken place when gold-bearing geothermal fluids flood this zone,a period described as the "prograde regime" by Blakestad and Stanley (1984).Such periods are characterized by high heat flow,high vertical fluid flow rates,and large volumes of focused fluid throughput Focused fluid throughput refers to the channeling of fluid discharge in an active geothermal system through zones of high permeability.Permeable fluid conduits in active geothermal fields (e.g.Waiotapu,New Zealand) include hydrothermal vent breccias and zone of open or closely spaced fracturing.Ellis (1979 ) summarizes evidence suggesting that periods of high fluid throughput are brief,on the order of thousands of years,relative to the lifespan of typical geothermal systems which is hundreds of thousands to several million years.
浅层黄金的矿化发生于一个外流通道周边所形成渗水的热液喷口角砾岩及裂隙岩体群.当含金的地热流体淹没此地域时,矿化似乎就已形成；这时期被Blakestad和Stanley描述为“淤积水情”(1984).此周期的特点是高度的热流动、垂直流体的高流动率以及巨大的集中流体量.集中流体量是指处于活动地热系统中通过高渗透性区域排出的流体.活动地热场（例如新西兰的怀奥塔普）流体的渗透通道包括热液喷口角砾岩和开口或小间距裂隙的区域.Ellis (1979 ) 通过总结证据提出,相对于典型地热系统的几十万至几百万年的寿命,大流体量的周期只有短暂的几千年.
Such elevated gold concentrations in solution imply a combination of source rock and geothermal reservoir chemistry conducive to gold mobilization.Characteristics of gold source rocks are discussed by Keays and Scott (1976) and Keays (1984),who point out that gold accessibility to solution transport depends on total gold content,mineralogical siting,timing of gold liberation,metamorphic and deformational history,and bulk chemical composition of the source rock.A good gold source contains an anomalous amount of accessible gold but may not be particularly anomalous in terms of its absolute gold content.
这种在液体里黄金浓度的提高表明矿源岩石和地热水库组合的化学作用有助于黄金的矿化.针对黄金矿源岩特征的论述,Keays和Scott (1976) 及Keays (1984) 指出黄金能否被液体运送取决于金的含量、矿物位置、黄金解离的时机、变质与变形的历史及矿源岩石的总化学成分.一个良好的黄金矿源岩含有异常总量的可及黄金,但其绝对黄金含量不一定异常.
Gold solubility as a function of solution chemistry has been treated in a number of studies since the pioneering work of Henley (1973) and Seward (1973).Results to date indicate that gold solubility in geothermal reservoirs at 100 ø to 300øC is enhanced by high temperature,reducing Eh,and neutral to alkaline pH.
作为溶液化学用途的黄金可溶性,自Henley (1973) 及Seward (1973)展开其先驱工作以来,已有数个针对黄金溶解性的研究.迄今的研究结果表明,高温、Eh值的降低以及中性到碱性的条件可增强100至300摄氏度地热水库中的黄金可溶性.
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