Evidence for a weak and overpressured decollement beneath sediment- dominated accretionary prisms

T. Byrne, D. Fisher

Research output: Contribution to journalArticle

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Abstract

Presents structural data from several underthrust sequences in southwest Alaska that suggest that the deformation regime beneath accretionary prisms is characterized by a subvertical σ1 and regionally extensive layer-parallel shearing. These results contrast markedly with the results obtained from the more shallow parts of accretionary prisms and fold and thrust belts where σ1 plunges gently seaward or toward the deformation front. The results emphasize the importance of dewatering and fluid flow in controlling the position of the decollement, which in turn determines how the accretionary prism grows. In essence, it is the development of a weak, overpressured decollement within a thick sediment pile that allows plate convergence to be partitioned into offscraping and underthrusting regimes. -from Authors

Original languageEnglish (US)
Pages (from-to)9081-9097
Number of pages17
JournalJournal of Geophysical Research
Volume95
Issue numberB6
DOIs
StatePublished - Jan 1 1990

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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