University of Wyoming
Browse
FACW_GEOL_2010_15252027_Miranda_John.pdf (7.63 MB)
Download file

Strain Localization Along the Atlantis Bank Oceanic Detachment Fault System, Southwest Indian Ridge

Download (7.63 MB)
journal contribution
posted on 2021-11-15, 21:37 authored by E. A. Miranda, Barbara John
Microstructural observations and mineral thermometry from in situ samples collected from the Atlantis Bank oceanic core complex (SW Indian Ridge) indicate that detachment faulting was initiated under hypersolidus conditions in the ductile regime and continued through subgreenschist temperatures through the ductile, semibrittle, and brittle regimes as strain localized along the exposed, now subhorizontal fault surface. Ductile, semibrittle, and brittle fabrics are developed within dominantly gabbroic rocks. Footwall rocks exhibit crystal plastic fabrics distributed over a structural thickness up to 400 m below the denuded fault surface exposed at the seafloor, whereas semibrittle and brittle fabrics are concentrated in the 80 and 30 m immediately below the principal slip surface of the detachment fault, respectively. Sample fabrics suggest that strain localization was achieved by dynamic recrystallization of plagioclase at temperatures between 910°C and 650°C, by amphibole-accommodated dissolution-precipitation creep at temperatures ~750°C-450°C, by chlorite-accommodated reaction softening at temperatures ~450°C-300°C, and by brittle fracturing and cataclasis at temperatures <300°C.

History

ISO

eng

Language

English

Publisher

University of Wyoming. Libraries

Journal title

Geochemistry Geophysics Geosystems

Collection

Faculty Publication - Geology & Geophysics

Department

  • Library Sciences - LIBS

Usage metrics

    Geology & Geophysics

    Categories

    Licence

    Exports