(Table 1.15) Composition of glassy basalts from the north part of the Bougault anomaly, Mid-Atlantic Ridge 15°N

Structure and composition of sub-surface bottom sediments from the southwest Barents Sea have been under study. The study has revealed heterogeneity of sediment structure resulted from temporal irregularity and variability of sedimentation processes. The study of the heavy minerals from 0.1-0.01 mm grain size fraction has shown prevalence of green hornblende, epidote, garnet, and ilmenite in all types of sediments; these minerals are the basis of terrigenous-mineralogical province. At the same time in different areas local terrigenous-mineralogical associations have been identified. Clay mineral composition of in the sediments was quite uniform: biotite, chlorite, hydromica, smectite. Despite this, a number of features indicating initial stages of clay mineral transformation has been identified. Differences in material composition and structure of the studied sediments are associated with rapid change in paleogeographic situation on the land - ice cover melting on the Kola Peninsula and subsequent Holocene climatic situation.

本研究针对巴伦支海西南部次表层海底沉积物的结构与组成特征展开系统分析。研究结果显示，沉积物结构呈现非均质性，该特征由沉积作用的时间不规则性与过程变异性共同导致。对0.1~0.01毫米粒级组分中的重矿物进行分析后发现，所有类型沉积物中均以绿色角闪石、绿帘石、石榴子石及钛铁矿为优势矿物，上述矿物构成了陆源矿物省的核心物质基础。与此同时，不同区域内均识别出区域性特有的陆源矿物组合。沉积物中的黏土矿物组成整体较为均一，主要包含黑云母、绿泥石、水云母与蒙脱石；尽管如此，研究仍发现若干反映黏土矿物初始转化阶段的特征。本次研究涉及的沉积物在物质组成与结构上的差异，与陆上古地理环境的快速变迁紧密相关——具体为科拉半岛冰盖消融及后续全新世气候格局的演变。