(Table 1.5) Contents of some volatile components in glassy MORB 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海底次表层沉积物的结构与组成展开了调查分析。研究结果表明，沉积作用过程的时间不规则性与动态变化导致了沉积物结构的非均质性。对0.1~0.01毫米粒度粒级组分中的重矿物开展的研究显示，各类沉积物中均以绿角闪石、绿帘石、石榴子石及钛铁矿为主，这些矿物构成了陆源矿物省的核心组成。与此同时，不同区域均识别出具有区域特征的陆源矿物组合。沉积物中的黏土矿物组成相对均一，主要包含黑云母、绿泥石、水云母及蒙脱石。尽管如此，研究仍发现了若干反映黏土矿物转化初始阶段的特征。本次研究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化紧密相关——即科拉半岛的冰盖消融以及随后的全新世气候格局。