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首页> 外文期刊>Geology of Ore Deposits: A Journal of Theoretical and Applied Papers on All Aspects of Ore Genesis >Formation Conditions of Gold-Silver Deposits in the Northern Okhotsk Region,Russia
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Formation Conditions of Gold-Silver Deposits in the Northern Okhotsk Region,Russia

机译：俄罗斯鄂霍次克州北部金银矿床的形成条件

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The paper considers the results of geochemical studies of gold-silver ore-magmatic systems and deposits in two of the largest ore districts of the northern Okhotsk region:the Evensk (Turomchinsk ore-magmatic system,the Dal'nee and Kvartsevoe deposits) and Omsukchan (the Dukat deposit) districts.New data on behavior of ore and alkaline elements and fluid inclusions are presented.Two genetic types of hydrothermal gold-silver gold-silver org-magnetic systems is their single-megastage development and bimetal pattern.The volcano-genic trend of magmatism is prevalent.The andesite-granodiorite volcano-plutonic rock association specialized for Aug,Ag,and K is a potentially ore-bearing one.The Turomchinsk ore-magmatic system,where the hydrothermal process begins with formation of zones with disseminated sulfide mineralization and extended multicomponent low-contrast geochemical fields,is a typical example of such systems.The main peculiarity of volcano-plutonic gold-silver ore-magnetic systems is their multimegastage and polymetallic mode,as well as their long-term and intricate development,which can be exemplified by the Dukat ore-magmatic system.There,two stages can be distinguished in the magmatic and hydrothermla activity related to ore-bearing volcano-plutonic associations:andesite-granodiorite (the early stage) and rhyolite-granite-leucogranite(the late,terminal stage).The last stage is distincly specialized for F,B,Ag,Sn,Mo,W,and Pb.In the Dukat system,Sn-Ag and Sn-rare metal mineralization is intensely developed,along with Ag-Pb and Au-Ag ores.Nevertheless,general regularities in formation of ores and related geochemical fields are preserved.The formation of Au-Ag ores in the multimegastage polymetallic volcano-plutonic Dukat ore-forming system and the single-megastage compositionally relatively simple volcanic Turomchinsk system occurred in similar environments:(1)under close temperaturs (355-205 deg C for the Evensk group of deposits and 340-175 deg C for the Dukat deposit)and pressures (170-20 bar and 135-70 bar,respectively);(2) from low-concentration fluids of similar salt composition (NaCl,KCl,CaCl_2,and MgCl_2)-3.9-0.4 and 6.4-0.4 wt% for the Evensk groups of deposits and the Dukat deposit,respectively;(3) at depths less than 1000 m;and (4) in a hydrothermal structural less than 1.5 km long.Mineral-forming solutions that formed Au-Ag and Ag ores substantially differ in composition from magmatic and postmagmatic fluids,which can be explained by dilution of the latter by meteoric waters.
机译：本文考虑了鄂霍次克州北部两个最大矿区的金-银矿石-岩浆系统和矿床的地球化学研究结果：Evensk（Turomchinsk岩浆系统，Dal'nee和Kvartsevoe矿床）和Omsukchan （杜卡特（Dukat）矿床）地区。提供了有关矿石和碱性元素及流体包裹体行为的新数据。热液金-银-金-银-有机-磁系统的两种遗传类型是其单兆级发育和双金属模式。岩浆作用的成因趋势是普遍的。专门用于Aug，Ag和K的安山岩-碎屑闪长岩火山-深成岩联合体是潜在的含矿物质。Turomchinsk矿石-岩浆系统，其中的热液过程始于形成散布的区域。硫化物矿化和扩展的多组分低对比度地球化学领域就是这类系统的典型例子。火山—深部金银矿—磁性系统的主要特征是它们的多阶段和多金属模式，以及它们长期而复杂的发展，可以用杜卡特岩浆系统来例证。在这里，与含矿火山岩有关的岩浆活动和水热活动可以分为两个阶段。古生代：安山岩-闪长闪长岩（早期）和流纹岩-花岗岩-白云母（晚期，末期）。最后一个阶段专门用于F，B，Ag，Sn，Mo，W和Pb。该体系中，Sn-Ag和Sn稀有金属矿化以及Ag-Pb和Au-Ag矿石都得到了强烈开发。尽管如此，仍保留了矿石形成和相关地球化学场的一般规律。多兆级多金属火山-岩溶杜卡特成矿系统和单兆级成分相对简单的图罗钦斯克火山系统发生在相似的环境中：（1）在接近温度（Evensk组沉积物为355-205℃和340-175℃）下为杜卡特沉积物）和压力（分别为170-20 bar和135-70 bar）;（2）来自盐浓度相似的低浓度流体（NaCl，KCl，CaCl_2和MgCl_2）-3.9-0.4和6.4-0.4 wt％ （3）深度小于1000 m;和（4）长度小于1.5 km的热液构造中的矿物形成溶液基本上形成了Au-Ag和Ag矿石岩浆液和后岩浆液的成分不同，这可以通过用流水稀释后者来解释。

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