Distinguishing between Deep-Water Sediment Facies: Turbidites, Contourites and Hemipelagites
| Autor: | Zeinab Smillie, Dorrik A. V. Stow |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
010502 geochemistry & geophysics 01 natural sciences Sedimentary structures Paleontology Continental margin ichnofacies microfabric 0105 earth and related environmental sciences deep-water systems lcsh:QE1-996.5 Sediment contourites Contourite hemipelagites lcsh:Geology Tectonics facies continental margin deposits sediment textures Facies General Earth and Planetary Sciences Ichnofacies Sedimentary rock Geology turbidites |
| Zdroj: | Geosciences, Vol 10, Iss 2, p 68 (2020) Geosciences Volume 10 Issue 2 |
| ISSN: | 2076-3263 |
| Popis: | The distinction between turbidites, contourites and hemipelagites in modern and ancient deep-water systems has long been a matter of controversy. This is partly because the processes themselves show a degree of overlap as part of a continuum, so that the deposit characteristics also overlap. In addition, the three facies types commonly occur within interbedded sequences of continental margin deposits. The nature of these end-member processes and their physical parameters are becoming much better known and are summarised here briefly. Good progress has also been made over the past decade in recognising differences between end-member facies in terms of their sedimentary structures, facies sequences, ichnofacies, sediment textures, composition and microfabric. These characteristics are summarised here in terms of standard facies models and the variations from these models that are typically encountered in natural systems. Nevertheless, it must be acknowledged that clear distinction is not always possible on the basis of sedimentary characteristics alone, and that uncertainties should be highlighted in any interpretation. A three-scale approach to distinction for all deep-water facies types should be attempted wherever possible, including large-scale (oceanographic and tectonic setting), regional-scale (architecture and association) and small-scale (sediment facies) observations. |
| Databáze: | OpenAIRE |
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