Sequence stratigraphy: eustasy or tectonic imprint?

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The lower-middle Eocene intervals in sections on the North Atlantic margins have been correlated through magnetobiostratigraphy, and the durations of the hiatuses have been precisely determined. This record is compared with that in sections in other basins where shallowing and intensive reworking occur. This study shows that there are two groups of unconformities and associated hiatuses around the lower/middle Eocene boundary. The older hiatuses, in the latest early Eocene, are generally short, even on the shelf (~ 1 m.y.); the younger hiatuses, in the early middle Eocene, are somewhat longer (> 2 m.y.). The stratigraphic record around the lower/middle Eocene boundary suggests that there may be two mechanisms acting simultaneously to produce unconformities. Unconformities of a given age on the shelf may result from a global fall in sea level, while their stratigraphically correlative unconformities on the slope and rise may result from tectonic instability. Unconformities related to the third-order cycles in sea level changes in Vail's model primarily may reflect tectoeustasy. -from Author

Original languageEnglish (US)
Pages (from-to)6641-6679
Number of pages39
JournalJournal of Geophysical Research
Issue numberB4
StatePublished - Jan 1 1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Oceanography
  • Forestry
  • Aquatic Science
  • Ecology
  • Condensed Matter Physics
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Materials Chemistry
  • Palaeontology

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