Golden plumes: Substantial gold enrichment of oceanic crust during ridge-plume interaction
Golden plumes: Substantial gold enrichment of oceanic crust during ridge-plume interaction
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DOI：
10.1130/g33301.1
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发表时间：
2013
期刊：
影响因子：
5.8
通讯作者：
A. Webber;S. Roberts;R. Taylor;I. Pitcairn
中科院分区：
文献类型：
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作者：
A. Webber;S. Roberts;R. Taylor;I. Pitcairn
地幔柱事件越来越多地被认为是地球上Au丰度高的地区的金（Au）的来源。然而，人们对羽流活动使大洋地壳富集Au的过程知之甚少，也不受限制。我们提出了第一个系统的研究大洋玄武岩中的Au浓度作为一个函数的距离，从羽状中心。我们表明，冰岛羽对大西洋中脊的影响，逐步丰富的大洋地壳Au沿着雷克雅内斯海脊多达13倍正常水平，超过600公里的距离，富集可以归因于特定的羽成分。冰岛热柱对Au的富集暗示了深部地幔上涌与主要金矿化之间的成因联系。
Mantle plume events are increasingly implicated as the source of gold (Au) in regions of the Earth that show a high Au endowment. However, the process of enriching oceanic crust in Au by plume activity is poorly understood and unconstrained. We present the first systematic study of Au concentrations in oceanic basalts as a function of distance from a plume center. We show that the influence of the Iceland plume on the Mid-Atlantic Ridge progressively enriches the oceanic crust in Au along the Reykjanes Ridge by as much as 13 times normal levels, over a distance of ∼600 km, and that the enrichment can be attributed to specific plume components. This Au enrichment by the Iceland plume implies a genetic relationship between deep mantle upwelling and major gold mineralization.