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    Along-strike structure of the Costa Rican convergent margin from seismic a refraction/reflection survey : evidence for underplating beneath the inner forearc

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    Clair_et_al-2016-Geochemistry,_Geophysics,_Geosystems.pdf (16.80Mb)
    Date
    2016-02-24
    Author
    St. Clair, James  Concept link
    Holbrook, W. Steven  Concept link
    Van Avendonk, Harm J. A.  Concept link
    Lizarralde, Daniel  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8004
    As published
    https://doi.org/10.1002/2015GC006029
    DOI
    10.1002/2015GC006029
    Keyword
     Costa Rica; Convergent margin; Subduction zone processes 
    Abstract
    The convergent margin offshore Costa Rica shows evidence of subsidence due to subduction erosion along the outer forearc and relatively high rates of uplift (∼3–6 mm/yr) along the coast. Recently erupted arc lavas exhibit a low 10Be signal, suggesting that although nearly the entire package of incoming sediments enters the subduction zone, very little of that material is carried directly with the downgoing Cocos plate to the magma generating depths of the mantle wedge. One mechanism that would explain both the low 10Be and the coastal uplift is the underplating of sediments, tectonically eroded material, and seamounts beneath the inner forearc. We present results of a 320 km long, trench-parallel seismic reflection and refraction study of the Costa Rican forearc. The primary observations are (1) margin perpendicular faulting of the basement, (2) thickening of the Cocos plate to the northwest, and (3) two weak bands of reflections in the multichannel seismic (MCS) reflection image with travel times similar to the top of the subducting Cocos plate. The modeled depths to these reflections are consistent with an ∼40 km long, 1–3 km thick region of underplated material ∼15 km beneath some of the highest observed coastal uplift rates in Costa Rica.
    Description
    Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 17 (2016): 501–520, doi:10.1002/2015GC006029.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 17 (2016): 501–520
     

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