In contrast to seamount chains, small solitary seamounts/seamount groups have rarely been sampled despite their large number and therefore their origins remain enigmatic. Here we present new ⁴⁰Ar/³⁹Ar, trace element and Nd‐Hf‐Pb isotope data from the solitary Demenitskoy Seamount, the isolated Tolkien seamount group and the Krylov Seamount and Ridge in the Canary Basin, Central Atlantic Ocean. Their chemical compositions range from intraplate ocean‐island‐basalt (Demenitskoy) to mid‐ocean‐ridge‐basalt (Tolkien and Krylov) types. Lavas from all three seamount groups, however, show geochemical evidence for involvement of enriched Canary/Cape Verde plume material. Seismic tomography shows that large areas around these mantle plumes consist of dispersed low‐velocity material, which could represent diffusely‐upwelling plume mantle. Melts from such upwelling mantle could form isolated seamounts. Diffuse upwelling of plume material is likely to be extremely widespread but has been poorly studied to date.

中文翻译：

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加那利盆地（东大西洋）孤立海山的起源：羽状物质在与热点航迹无关的海山起源中的作用

与海山链相反，尽管孤海山/海山群数量众多，却很少被采样，因此其起源仍然是个谜。在这里，我们介绍了新的⁴⁰ Ar / ³⁹来自孤立的Demenitskoy海山，孤立的Tolkien海山群以及中大西洋加那利盆地的Krylov海山和海岭的Ar，痕量元素和Nd-Hf-Pb同位素数据。它们的化学成分范围从板块内的海岛玄武岩（Demenitskoy）到中海脊玄武岩（Tolkien和Krylov）类型。但是，来自所有三个海山群的拉瓦斯均显示出富含金丝雀/佛得角羽状羽化物质的地球化学证据。地震层析成像显示，这些地幔柱周围的大部分区域由分散的低速物质组成，这可能代表着扩散上升的地幔柱。来自这种上升流的地幔的融化可能形成孤立的海山。羽状材料的扩散上升流可能非常普遍，但迄今为止研究不多。