Abstract

The work is devoted to the study of ore minerals from the surface horizon of ore-bearing sediments in the Pobeda hydrothermal cluster using the following methods: optical microscopy, scanning electron microscopy, and X-ray spectral microanalysis. It was found that ore minerals are represented by fragments of Cu–Fe sulfides (isocubanite, chalcopyrite, and pyrite), newly formed iron hydroxides, and atacamite. In addition, barite and edaphogenic material as talcified silicate clasts, sometimes with sulfide inclusions, are present. Structural-morphological types of iron hydroxides are distinguished. Based on the hydrophysical data, the location of assumed active hydrothermal vent in the Pobeda-3 ore occurrence area was updated. Distribution of the studied minerals depending on the location relative to active hydrothermal vents is described. Decrease in the size and amount of hydrothermal mineral clasts and edaphogenic material, as well as increase in the degree of sulfide replacement by iron hydroxides, were observed when moving away from the sources. Moreover, decrease in the Cu/Fe ratio in the chemical composition of Cu–Fe sulfides is also noted. An unidentified phase of Cu_3.57‒4.22Fe_1.71‒2.19S_4.99‒5.31 with the chalcopyrite lamellas was established in the surface horizon of the column at station 37L245g.

中文翻译：

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波贝达热液簇（17°44.9′−17°07.6′ N MAR）底部沉积物表层热液活动的矿物指标

摘要

这项工作致力于使用以下方法研究 Pobeda 热液簇中含矿沉积物地表的矿石矿物：光学显微镜、扫描电子显微镜和 X 射线光谱微分析。研究发现，矿石矿物以铜铁硫化物碎片（异立方矿、黄铜矿和黄铁矿）、新形成的氢氧化铁和氯铜矿为代表。此外，还存在重晶石和滑石化硅酸盐碎屑形式的土壤生成物质，有时还含有硫化物包裹体。氢氧化铁的结构形态类型是有区别的。根据水文物理数据，更新了 Pobeda-3 矿产区假定的活跃热液喷口的位置。描述了所研究矿物的分布取决于相对于活跃热液喷口的位置。当远离源头时，观察到热液矿物碎屑和土壤生成物质的尺寸和数量减少，以及氢氧化铁取代硫化物的程度增加。此外，还注意到 Cu-Fe 硫化物化学成分中 Cu/Fe 比率的降低。未识别的 Cu 相_3.57-4.22 Fe _1.71-2.19 S _4.99-5.31与黄铜矿片层在 37L245g 站的柱体表面层中建立。