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    Petrophysical analysis of a mid-crustal reflector in the IBERSEIS profile, SW Spain

    Access Status
    Fulltext not available
    Authors
    Brown, D.
    Zhang, X.
    Palomeras, I.
    Simancas, F.
    Carbonell, R.
    Juhlin, Christopher
    Salisbury, M.
    Date
    2012
    Type
    Journal Article
    
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    Citation
    Brown, D. and Zhang, X. and Palomeras, I. and Simancas, F. and Carbonell, R. and Juhlin, C. and Salisbury, M. 2012. Petrophysical analysis of a mid-crustal reflector in the IBERSEIS profile, SW Spain. Tectonophysics. 550-553: pp. 35-46.
    Source Title
    Tectonophysics
    DOI
    10.1016/j.tecto.2012.05.004
    ISSN
    0040-1951
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/7346
    Collection
    • Curtin Research Publications
    Abstract

    The origin of strong crustal reflectors in vertical incidence reflection seismic data is generally attributed to either rock layering, deformation fabrics in shear zones, fluids, or igneous intrusions. The IBERSEIS normal incidence reflection and wide-angle seismic profiles in SW Spain imaged a large, high velocity, subhorizontal reflector in the middle crust (the IBERSEIS Reflective Body) whose origin has been attributed to a mafic intrusion. In order to test this hypothesis, in this paper we present laboratory measurements of Vp, Vs, and density from 17 samples of mafic igneous and metamorphic rocks, and metasediments that are thought to be equivalent to the proposed IBERSEIS Reflective Body. These measurements are then corrected to 400 °C at 600. MPa and used to calculate Poisson's ratio and to compare it, Vp, and Vs to values measured in situ by wide-angle data. Finally, normal incidence reflection coefficients are calculated to test if the measured lithologies could reproduce the reflectivity imaged in the vertical incidence reflection seismic data for the IBERSEIS Reflective Body. Our physical property measurements are very similar to those modeled from the wide-angle data, and our reflection coefficients are sufficiently high to cause strong mid-crustal reflectivity. Our data indicate, therefore, that previous interpretations of the IBERSEIS Reflective Body as a mafic sill are quite reasonable. © 2012 Elsevier B.V.

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