Annotated record of the detailed examination of ferromanganese concretions from the Svalbard shelf in the Barents Sea

Ferromanganese concretions from ten stations in the Barents Sea have been analysed for 24 elements. The deposits occur as discoidal and flat concretions and as coatings, in the latter case on lithified or detrital material or as extensive pavements on the Svalbard shelf. The concretions are compositionally similar to Baltic concretions but differ considerably from deep-ocean nodules, particularly in Cu, Ni and Co contents. Statistical analyses reveal distinct correlations between Mn, Na, Ba, Ni and Cu; the Mn-rich coatings showed enrichment of Mo, Zn and possibly Co in a Mn-phase. The iron phase holds high concretions of P and As. Two iron-rich concretions with high contents of P, Ca, Sr, Y, Yb and La were found east and northeast of Spitsbergen Banken, probably indicating upwelling of nutrient-rich, cold polar water along the Svalbard shelf.

对巴伦支海10个站位的铁锰结核（Ferromanganese concretions）开展了24种元素的分析测试。该类沉积物以盘状、扁平状结核以及包壳两种形式产出：其中包壳可附着于岩化或碎屑物质之上，或在斯瓦尔巴德（Svalbard）陆架形成大面积铺覆层。此类结核在成分上与波罗的海结核相似，但与深海锰结核差异显著，尤其在铜（Cu）、镍（Ni）与钴（Co）的含量方面。统计分析结果显示，锰（Mn）、钠（Na）、钡（Ba）、镍（Ni）与铜（Cu）之间存在显著相关性；富锰包壳在锰物相中表现出钼（Mo）、锌（Zn）以及可能的钴（Co）的富集。铁物相则富集磷（P）与砷（As）。在斯匹次卑尔根滩（Spitsbergen Banken）东侧及东北侧发现了2个富铁结核，其磷（P）、钙（Ca）、锶（Sr）、钇（Y）、镱（Yb）及镧（La）含量较高，该特征可能指示斯瓦尔巴德陆架沿线存在营养物质富集的寒冷极地上升流。