Substrate rocks of Fe-Mn crusts on the IOAN and Dalmorgeologiya Guyots

Substratum of cobalt-manganese crusts penetrated by numerous deep-sea drill holes on the IOAN and Dalmorgeologiya Guyots of Magellan Seamounts in the Pacific Ocean has been studied. Rocks have been characterized, and ferromanganese manifestations developed in the substratum in different forms have been studied in detail. They are considered to be products of deposition of water fluids arising in the volcanic pedestal and unloading on the guyot's periphery when penetrating into top parts of rocks to different degree phosphatized mainly by replacement. It is demonstrated by numerous substratum relicts and remains of organisms in them.

针对太平洋麦哲伦海山IOAN与Dalmorgeologiya平顶海山区域内，被大量深海钻孔穿透的钴锰结壳基底开展了相关研究。已对该区域的岩石进行了岩性特征表征，并对基底内以多种形态产出的铁锰质产出体开展了详细研究。研究认为，此类铁锰质产出体系流体沉积成因：源自火山基座的流体渗透进入岩石上部并发生不同程度磷灰石化（主要以交代作用方式）后，于平顶海山周缘卸载沉积而成。基底中的大量残留体与赋存于其中的生物遗体可佐证该成因机制。