Cyclic and Dyscyclic Black Shale Formation
作者： A. Wetzel
DOI: 10.1007/978-3-642-75829-4_33
关键词: Oil shale 、 Sediment 、 Sedimentary rock 、 Turbidity current 、 Geochemistry 、 Bottom water 、 Organic matter 、 Lithology 、 Geology 、 Sea level
摘要: Cyclic and dyscyclic sedimentary processes forming black shales are discussed. Based on cycle length its lithologic character four main types of variations can be distinguished: (1) Mega-scale cycles correspond to periods the earth’s history with frequently occurring shales. (2) Macro-scale form units. They result from long-term changes in bottom water circulation, supply organic matter, sea level fluctuations. (3) Meso-scale documented shale strata. fluctuations oxygen concentration matter predominate, whereas rare, i.e. rapid input sediment or matter. (4) Micro-scale laminae layers within
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