Sequence‐stratigraphic concepts applied to the identification of depositional basins and global tectonic cycles
| Autor: | R. C. Horwitz, B. Krapez |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Australian Journal of Earth Sciences. 44:879-886 |
| ISSN: | 1440-0952 0812-0099 |
| DOI: | 10.1080/08120099708728360 |
| Popis: | Division of thousands of metres of strata into genetic units that are tied to depositional and tectonic origins is a problem common to all stratigraphic successions. Sequence stratigraphy, which defines large‐scale genetic units by a hierarchy of unconformity‐bounded sequences, resolves that problem. However, there are no physical‐recognition criteria for the genetic rank of sequence boundaries. Therefore, genetic‐stratigraphic division by unconformity‐bounded sequences alone is not possible, because all successions are composites of sequences of different origins. Three orders of unconformity‐bounded sequences are defined: third‐order sequences are basin‐filling rhythms; second‐order sequences are depositional basins or tectonic stages; and first‐order sequences are global tectonic cycles. Sequence mapping must identify these orders by genetic‐interpretive and basin‐analysis techniques. Depositional basins (second‐order sequences) are classified primarily, by subsidence mechanism, into extensional, therm... |
| Databáze: | OpenAIRE |
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