Bright seismic reflections and fluid movement by porous flow in the lower crust

Details Bright seismic reflections and fluid movement by porous flow in the lower crust Bright seismic reflections and fluid movement by porous flow in the lower crust

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.126..161s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 126, no. 1-3, p. 161-169

Physics

Geophysics

2

Earth Crust, Fluid Flow, Geophysics, Mathematical Models, Porosity, Reflectance, Seismic Waves, Tectonics, Viscous Fluids, Crustal Fractures, Equations Of State, Flow Distribution, Fluid Pressure, Geophysics, Phase Transformations, Temperature Dependence, Vertical Distribution

Scientific paper

The origin of high-amplitude lower crustal bright seismic reflections in a Phanerozoic area is investigated by modeling a distribution of metamorphic fluid flow through pores as a possible explanation. A numerical model of metamorphic fluid flow in a viscous, porous medium is developed. A model is applied to a tectonically active area such as the Basin and Range, where viscous behavior of the lower crust is suggested. Calculations show that the characteristic vertical dimension of relative volumetric flow variations corresponds to the thickness of seismic lamellae as determined from reflection frequency spectra for the Basin and Range. This result shows that a dynamic effect, which was produced by fluid pressure and viscous matrix resistance, could be responsible for the origin of the seismic lamellae in the lower crust in an area of active tectonics.

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