Slow Cenozoic uplift of the western Andean Cordillera indicated by cosmogenic 3He in alluvial boulders from the Pacific Planation Surface

Laura A. Evenstar, Finlay M. Stuart, Adrian J. Hartley, Brain Tattitch

    Research output: Contribution to journalArticle

    • 5 Citations

    Abstract

    To determine the mechanisms responsible for mountain belt growth, it is important to accurately establish the timing of surface uplift. Here we exploit the altitude control on the production rate of in situ cosmogenic nuclides to test the hypothesis that the Andes was uplifted in the late Miocene. High concentrations of in situ cosmogenic 3He (3Hecos) have previously been measured in alluvial boulders on the western flank of the Central Andes, northern Chile (Evenstar et al. 2009). These are consistent with deposition soon after formation of the surface (13–14 Ma). We have modeled the accumulation of cosmogenic 3He in several different surface uplift scenarios and compared them to the measured concentrations. The measured 3Hecos concentrations are too high to be produced by late Miocene uplift and imply that the western flank of the Andean Cordillera attained a substantial part of its current elevation prior to 14 Myr ago.

    Original languageEnglish
    Pages (from-to)8448-8455
    Number of pages8
    JournalGeophysical Research Letters
    Volume42
    Issue number20
    Early online date12 Oct 2015
    DOIs
    StatePublished - 28 Oct 2015

    Fingerprint

    spacing
    borders
    orphan
    transform
    strokes
    caps
    margins
    color
    uplift
    cordillera
    Miocene
    planation
    mountain
    altitude control
    Chile
    nuclides
    mountains
    time measurement

    Keywords

    • Andean uplift
    • Chile
    • cosmogenic Isotopes
    • Longitudinal Valley
    • paleoelevation

    ASJC Scopus subject areas

    • Earth and Planetary Sciences(all)
    • Geophysics

    Cite this

    Slow Cenozoic uplift of the western Andean Cordillera indicated by cosmogenic 3He in alluvial boulders from the Pacific Planation Surface. / Evenstar, Laura A.; Stuart, Finlay M.; Hartley, Adrian J.; Tattitch, Brain.

    In: Geophysical Research Letters, Vol. 42, No. 20, 28.10.2015, p. 8448-8455.

    Research output: Contribution to journalArticle

    Evenstar, Laura A.; Stuart, Finlay M.; Hartley, Adrian J.; Tattitch, Brain / Slow Cenozoic uplift of the western Andean Cordillera indicated by cosmogenic 3He in alluvial boulders from the Pacific Planation Surface.

    In: Geophysical Research Letters, Vol. 42, No. 20, 28.10.2015, p. 8448-8455.

    Research output: Contribution to journalArticle

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    abstract = "To determine the mechanisms responsible for mountain belt growth, it is important to accurately establish the timing of surface uplift. Here we exploit the altitude control on the production rate of in situ cosmogenic nuclides to test the hypothesis that the Andes was uplifted in the late Miocene. High concentrations of in situ cosmogenic 3He (3Hecos) have previously been measured in alluvial boulders on the western flank of the Central Andes, northern Chile (Evenstar et al. 2009). These are consistent with deposition soon after formation of the surface (13–14 Ma). We have modeled the accumulation of cosmogenic 3He in several different surface uplift scenarios and compared them to the measured concentrations. The measured 3Hecos concentrations are too high to be produced by late Miocene uplift and imply that the western flank of the Andean Cordillera attained a substantial part of its current elevation prior to 14 Myr ago.",
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