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    The evolution of the footwall to the Ronda subcontinental mantle peridotites: insights from the Nieves Unit (western Betic Cordillera)

    192017_94217_4724_1_merged_1353340831.pdf (9.974Mb)
    Access Status
    Open access
    Authors
    Mazzoli, S.
    Martín-Algarra, A.
    Reddy, Steven
    López Sánchez-Vizcaíno, V.
    Fedele, L.
    Noviello, A.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Mazzoli, Stefano and Martín-Algarra, A. and Reddy, Steven and López Sánchez-Vizcaíno, V. and Fedele, L. and Noviello, A. 2013. The evolution of the footwall to the Ronda subcontinental mantle peridotites: insights from the Nieves Unit (western Betic Cordillera). Journal of the Geological Society. 170: pp. 385-402.
    Source Title
    Journal of the Geological Society
    DOI
    10.1144/jgs2012-105
    ISSN
    00167649
    Remarks

    Abbreviated title: Evolution of carbonates in the footwall of the Ronda peridotites

    Journal of the Geological Society. 170 (2013). http://jgs.lyellcollection.org/content/170/3/385. Copyright © Geological Society of London 2013

    URI
    http://hdl.handle.net/20.500.11937/25240
    Collection
    • Curtin Research Publications
    Abstract

    Strongly heterogeneous deformation and extreme metamorphic gradients characterize the dominantly carbonate Nieves Unit in the footwall to the Ronda mantle extrusion wedge in the western Betic Cordillera. A well-developed foliation and mineral lineation, together with isoclinal intrafolial folds, occur in silicate-bearing, calcite or dolomite marbles within a c. 1.5 km thick metamorphic aureole underlying the peridotites. For the inferred maximum pressure of 300 MPa, petrological investigations allow us to define temperature ranges for the main zones of the metamorphic aureole: >510 °C (probably c. 700 °C) for the forsterite zone; 510–430 °C for the diopside zone; 430–360 °C for the tremolite zone; 360–330 °C for the phlogopite zone. Field structural analysis integrated with petrological, microstructural and electron backscatter diffraction textural data document large finite strains consistent with general shear within the metamorphic aureole, associated with NW-directed thrusting of the peridotites. On the other hand, post-kinematic silicate growth suggests that heat diffusion from the high-temperature peridotites continued after the final emplacement of the Ronda mantle extrusion wedge, leading to final zoning of the metamorphic aureole and to local partial annealing of calcite marble textures, particularly in the highest-temperature zone of the thermally softened footwall carbonates. Following substantial cooling, renewed crustal shortening affected the whole Nieves Unit, resulting in widespread development of NE–SW-trending meso-scale folds.

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