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    Spatial variations of effective elastic thickness of the lithosphere in Central America and surrounding regions

    197182_197182.pdf (2.715Mb)
    Access Status
    Open access
    Authors
    Jiménez-Díaz, Alberto
    Ruiz, Javier
    Pérez-Gussinyé, Marta
    Kirby, Jon
    Álvarez-Gómez, Jose
    Tejero, Rosa
    Capote, Ramon
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Jiménez-Díaz, Alberto and Ruiz, Javier and Pérez-Gussinyé, Marta and Kirby, Jon and Álvarez-Gómez, Jose and Tejero, Rosa and Capote, Ramon. 2014. Spatial variations of effective elastic thickness of the lithosphere in Central America and surrounding regions. Earth and Planetary Science Letters. 391: pp. 55-66.
    Source Title
    Earth and Planetary Science Letters
    DOI
    10.1016/j.epsl.2014.01.042
    ISSN
    0012821X
    Remarks

    NOTICE: this is the author’s version of a work that was accepted for publication in Earth and Planetary Science Letters. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Earth and Planetary Science Letters, Vol. 391 (2014). DOI: 10.1016/j.epsl.2014.01.042

    URI
    http://hdl.handle.net/20.500.11937/34235
    Collection
    • Curtin Research Publications
    Abstract

    As a proxy for long-term lithospheric strength, the effective elastic thickness (Te) can be used to understand the relationship between lithospheric rheology and geodynamic evolution of complex tectonic settings. Here we present, for the first time, high-resolution maps of spatial variations of Te in Central America and surrounding regions from the analysis of the coherence between topography and Bouguer gravity anomaly using multitaper and wavelet methods. Regardless of the technical differences between the two methods, there is a good overall agreement in the spatial variations of Te recovered from both methods. Although absolute Te values can vary in both maps, the qualitative Te structure and location of the main Te gradients are very similar. The pattern of the Te variations in Central America and surrounding regions agrees well with the tectonic provinces in the region, and it is closely related to major tectonic boundaries, where the Middle American and Lesser Antilles subduction zones are characterized by a band of high Te on the downgoing slab seaward of the trenches. These high Te values are related to internal loads (and in the case of the southernmost tip of the Lesser Antilles subduction zone also associated with a large amount of sediments) and should be interpreted with caution. Finally, there is a relatively good correlation, despite some uncertainties, between surface heat flow and our Te results for the study area. These results suggest that although this area is geologically complex, the thermal state of the lithosphere has profound influence on its strength, such that Te is strongly governed by thermal structure.

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