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  • 1
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    The role of fault zones and melts as agents of weakening, hardening and differentiation of the continental crust - a synthesis (2001)
    The Geological Society Publ. House
    In:  Bull., Polar Proj. OP-O3A4, The Nature and Tectonic Significance of Fault Zone Weakening, Bath, The Geological Society Publ. House, vol. 186, no. XVI:, pp. 305-332, (ISBN: 3-540-23712-7)
    Details
    Publication Date: 2001
    Keywords: Fault zone ; Rock mechanics ; Tectonics ; Fault plane solution, focal mechanism ; SAF ; Modelling ; Friction ; permeability ; Fluids ; Ocean Drilling Program ; Alpine ; Fault ; Rheology ; geometry ; melts ; Fracture ; Physical properties of rocks
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Eocene extension and meteoric fluid flow in the Wildhorse detachment, Pioneer metamorphic core complex, Idaho (2015)
    Geological Society of America (GSA)
    Details
    Publication Date: 2015-07-30
    Description: The relationship between microstructure and fluid flow traced by hydrogen isotope ratios (D) is examined within the Wildhorse detachment system of the Pioneer metamorphic core complex in south-central Idaho. Within the detachment footwall, 100-m-thick mylonitic quartzite containing minor white mica and K-feldspar displays a NW-trending stretching lineation and consistent top-to-the-NW sense of shear criteria. Microstructures within the detachment footwall comprise two groups: quartz ribbons and relict quartz grains flattened within the foliation, with porphyroclastic white mica fish; and intensely deformed and recrystallized quartz with high-aspect-ratio white mica arranged within C' shear bands. White mica D values are highly negative and cluster around –145 in high-aspect-ratio white mica and around –120 in porphyroclastic white mica fish. The most negative values are interpreted to reflect interaction with meteoric fluids from a high-elevation catchment (3000–4000 m), and the less negative values are interpreted to represent incomplete hydrogen isotope exchange between the meteoric fluid and the pre-extensional metamorphic fluid D values in the white mica porphyroclasts. A suite of tightly clustered 40 Ar/ 39 Ar ages from synkinematic white mica in the detachment footwall dates deformation, recrystallization, fluid-rock interaction, and therefore the presence of high topography at 38–37 Ma; these ages are consistent with the cooling/exhumation history of the high-grade core of the Pioneer metamorphic core complex in the late Eocene. The 38–37 Ma 40 Ar/ 39 Ar ages are substantially younger than previously published ages of high topography in British Columbia to the north (49–47 Ma), in line with the hypothesis that high topography propagated from north to south in the northern segment of the North American Cordillera through Eocene time.
    Print ISSN: 1941-8264
    Electronic ISSN: 1947-4253
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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    PAPER CURRENT
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