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首页> 外文期刊>Geochemistry, geophysics, geosystems >The formation of gold-rich seafloor sulfide deposits: Evidence from the Beebe hydrothermal vent field, Cayman Trough
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The formation of gold-rich seafloor sulfide deposits: Evidence from the Beebe hydrothermal vent field, Cayman Trough

机译：富含金的海底硫化物矿床的形成：来自Beebe Haderothermal Vent Field，Cayman Grough的证据

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The Beebe vent field (BVF) in the Cayman Trough has built an auriferous massive sulfide deposit on the ultraslow spreading mid-Cayman spreading center. The genesis of auriferous sulfide deposits at mid-ocean ridges is not fully understood, although there is a growing recognition that slow and ultraslow spreading centers are conducive to gold mineralization. Analysis of hydrothermal precipitates from the BVF indicates that the highest gold contents are present within beehive diffusers, which have developed a highly porous pyrrhotite framework. The beehive structure allows vent fluids to effuse slowly while allowing ingress of seawater to cool the fluid. The prevalence of pyrrhotite in the beehive samples, lack of sulfates, association between pyrrhotite and gold grains, and results of thermodynamic modeling suggest gold precipitation occurred under highly reduced conditions even during mixing with seawater. In contrast, high-temperature chimneys, with a single orifice, maintain high temperatures to the primary vent orifice and much of the gold is lost to seawater. Despite this, both chimney types are relatively gold-enriched, which points to a further underlying cause for high gold at the BVF such as interaction of hydrothermal fluids with ultramafic lithologies in the basement. The final gold composition of the deposit is partially controlled by loss of gold during mass-wasting of the material, with gold depletion most prevalent in blocks formed at beehive-type chimneys. The BVF demonstrates that the overall gold content of a massive sulfide deposit is the sum of basement, precipitation, and surface processes.
机译：Cayman Trough中的Beebe通风领域（BVF）在超声波展开了Cayman传播中心的超声波中建造了一种抗真菌硫化物沉积物。虽然存在越来越多的识别，但慢速和超薄传播中心有利于金矿化，但避免识别较大的识别，却不完全理解。来自BVF的水热沉淀物的分析表明，最高的金含量存在于蜂箱扩散器中，这开发了高度多孔的Pyrlotite框架。蜂箱结构允许排气流体缓慢地进行，同时允许海水进入液体冷却流体。蜂巢样品中Pyrhotite的患病率，缺乏硫酸盐，Pyrrhotite和金粒之间的关联，以及热力学建模的结果表明，即使在与海水混合期间，也会在高度降低的情况下发生金沉淀。相比之下，具有单个孔的高温烟囱将高温保持在初级通气孔和大部分金中对海水丢失。尽管如此，烟囱类型都是相对镀金的，这对于BVF在BVF的高金中的进一步潜在的原因，例如水热流体在地下室中的超微岩石的相互作用。沉积物的最终黄金组成部分通过在材料的大量浪费过程中损失金而部分控制，黄金耗竭在蜂巢型烟囱中形成的块中最普遍的。 BVF表明，大规模硫化矿床的总金含量是地下室，沉淀和表面过程的总和。

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