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    Pulsed subduction accretion and tectonic erosion reconstructed since 2.5 Ma from the tephra record offshore Costa Rica

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    Clift 2005GC000963.pdf (1.202Mb)
    Date
    2005-09-27
    Author
    Clift, Peter D.  Concept link
    Chan, Lui-Heung  Concept link
    Blusztajn, Jerzy S.  Concept link
    Layne, Graham D.  Concept link
    Kastner, Miriam  Concept link
    Kelly, Robyn K.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/446
    As published
    https://doi.org/10.1029/2005GC000963
    DOI
    10.1029/2005GC000963
    Keyword
     Costa Rica; Subduction; Geochemistry; Tephra 
    Abstract
    Tephra layers recovered by Ocean Drilling Program from the forearc and trench regions offshore the Nicoya Peninsula of Costa Rica allow the temporal evolution of the volcanic arc to be reconstructed since 2.5 Ma. Major and trace element analyses by microprobe methods reveal a dominant tholeiitic character and a provenance in the Costa Rican area. The tephra show long-term coherent variability in geochemistry. One tephra dated at 1.45 Ma shows minimum values in ɛ Nd and maximum Li/Y consistent with very high degrees of sediment recycling at this time. However, overall Li/Y and δ7Li increase with SiO2 content, suggesting addition of heavy Li through forearc tectonic erosion and crustal assimilation. Peak values in δ7Li starting at 1.45 Ma and lasting ∼0.5 m.y. indicate enhanced tectonic erosion of the forearc possibly caused by subduction of a seamount at 1.45 Ma. The tephra record indicates significant temporal variability in terms of sediment subduction, reconciling the geologic evidence for long-term tectonic erosion and geochemical evidence for recent sediment accretion in the modern Central American arc.
    Description
    Author Posting. © American Geophysical Union, 2005. 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 6 (2005): Q09016, doi:10.1029/2005GC000963.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry Geophysics Geosystems 6 (2005): Q09016
     

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