利沃夫古生代坳陷下泥盆统红色陆生组沉积特征

M. Kovalchuk, G. S. Kompanets
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引用次数: 0

摘要

利沃夫古生代海槽德涅斯特系列下泥盆统陆相-陆源组沉积主要形成于冲积相环境中,呈红色(氧化介质),部分为恢复性(灰色)沉积。下泥盆统陆相红陆源组沉积组在形成和存在过程中,经历了沉积、钻蚀、裂裂等一系列连续的成岩作用阶段,并受到成岩作用阶段上釉作用的显著影响。考虑到地层的地球化学(氧化性和还原性)条件,研究了不同相(河道相、河岸相和河漫滩相)的砂岩、粉砂岩、泥质岩和混合组成的岩石的变质作用。确定了岩石的高度变质作用(直至晚变质作用阶段)。研究发现,不同岩石类型、不同面属的同一类型岩石,即使处于同一层位,其变质作用的性质和强度也存在显著差异。研究表明,沉积物的变质作用程度与沉积物的结构和结构特征、物质组成和相缘关系有关
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FEATURES OF THE DEPOSITS OF THE LOWER DEVONIAN RED-COLOUR-TERRIGENIOS FORMATION OF THE LVIV PALEOZOIC DEPRESSION
Sediments of the Lower Devonian continental red-terrigenous formation of the Dniester series of the Lviv Paleozoic troughwere formed in the alluvial facies environment mainly in the oxidizing medium (they have a red color), and some of them are inthe restorative (gray color of the sediments). In the process of formation and existence, sedimentary formations of the LowerDevonian continental red-terrigenous formation underwent a number of successive stages of lithogenesis: sedimentary, diaand catagenesis and were significantly influenced by glazing processes at the stage of diagenesis. The authors investigatedthe catagenetic transformations of sandstones, siltstones, argillites, rocks of mixed composition of different facies (channel,riparian and floodplain facies conditions) taking into account geochemical (both oxidative and reductive) conditions of formation.A high degree of catagenetic transformations (up to the stage of late catagenesis) of rocks has been established. It was foundthat the nature and intensity of catagenetic transformations not only of different petrotypes, but also of the same type of rocksof different facial affiliation differ significantly, even if they are at the same stratigraphic level. It is established that the degreeof catagenetic transformations of sediments depends on their structural and textural features, material composition and facialaffiliation
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