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    Pantasma: Evidence for a Pleistocene circa 14 km diameter impact crater in Nicaragua

    Access Status
    Fulltext not available
    Authors
    Rochette, P.
    Alac, R.
    Beck, P.
    Brocard, G.
    Cavosie, Aaron
    Debaille, V.
    Devouard, B.
    Jourdan, F.
    Mougel, B.
    Moustard, F.
    Moynier, F.
    Nomade, S.
    Osinski, G.
    Cornec, J.
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Rochette, P. and Alac, R. and Beck, P. and Brocard, G. and Cavosie, A. and Debaille, V. and Devouard, B. et al. 2019. Pantasma: Evidence for a Pleistocene circa 14 km diameter impact crater in Nicaragua. Meteoritics & Planetary Science. 54 (4): pp. 880-901.
    Source Title
    Meteoritics & Planetary Science
    ISSN
    1086-9379
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/73930
    Collection
    • Curtin Research Publications
    Abstract

    The circa 14 km diameter Pantasma circular structure in Oligocene volcanic rocks in Nicaragua is here studied for the first time to understand its origin. Geomorphology, field mapping, and petrographic and geochemical investigations all are consistent with an impact origin for the Pantasma structure. Observations supporting an impact origin include outward‐dipping volcanic flows, the presence of former melt‐bearing polymict breccia, impact glass (with lechatelierite and low H2O, <300 ppm), and also a possible ejecta layer containing Paleozoic rocks which originated from hundreds of meters below the surface. Diagnostic evidence for impact is provided by detection in impact glass of the former presence of reidite in granular zircon as well as coesite, and extraterrestrial ε54Cr value in polymict breccia. Two 40Ar/39Ar plateau ages with a combined weighted mean age of 815 ± 11 ka (2 σ; P = 0.17) were obtained on impact glass. This age is consistent with geomorphological data and erosion modeling, which all suggest a rather young crater. Pantasma is only the fourth exposed crater >10 km found in the Americas south of N30 latitude, and provides further evidence that a significant number of impact craters may remain to be discovered in Central and South America.

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