A subducting seamount beneath the Mediterranean Ridge

Research output: Contribution to journalArticlepeer-review

Authors

  • IMERSE Working Group

Colleges, School and Institutes

External organisations

  • UNIVERSITY OF HAMBURG
  • GEOMAR - Helmholtz Zentrum für Ozeanforschung Kiel
  • Res. Centre for Marine Geosciences
  • Institute for Geophysics

Abstract

Two transverse morphological tracks across the front of the Mediterranean Ridge were swath mapped with a Hydrosweep instrument system. Along the tracks, ridges and troughs at the front of the accretionary prism are disrupted and bent in the direction of relative plate convergence. The longer of the two tracks extends to Bannock Basin, a brine-filled depression with a closed outer moat around a central mound. Seismic reflection data and a gravity anomaly show a buried circular seamount beneath Bannock Basin whose summit is the mound. This indicates an origin of the larger transverse track and Bannock Basin from a subducting seamount. Beneath Bannock Basin, the seamount has displaced about 340 km3 of the Messinian section and yet the seafloor has not been uplifted. Therefore, considerable evaporitic material is inferred to have been displaced by the seamount and Bannock Basin is a likely vent for large quantities of dissolved materials from the disrupted Messinian evaporitic sequence.

Details

Original languageEnglish
Pages (from-to)249-261
Number of pages13
JournalTectonophysics
Volume271
Issue number3-4
Publication statusPublished - 15 Apr 1997

Keywords

  • Continental margins, Mediterranean Ridge, Tectonics

ASJC Scopus subject areas