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“Equator Crossing” of Shatsky Rise?: New insights on Shatsky Rise tectonic motion from the downhole magnetic architecture of the uppermost lava sequences at Tamu Massif

Authors

  • Masako Tominaga,

    Corresponding author
    1. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA
    2. Now at Department of Geological Sciences, Michigan State University, East Lansing, Michigan, USA
    • Corresponding author: M. Tominaga, Department of Geological Sciences, Michigan State University, 206 Natural Science Bldg., East Lansing, MI 48824, USA. (tominaga@msu.edu)

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  • Helen F. Evans,

    1. Department of Marine Geology and Geophysics, Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, USA
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  • Gerardo Iturrino

    1. Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, USA
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Abstract

[1] Shatsky Rise is a Large Igneous Province (LIP) currently located in the northwestern Pacific. New downhole magnetic logging data from Integrated Ocean Drilling Program (IODP) Hole U1347A at Tamu Massif of Shatsky Rise captured the magnetic architecture in the uppermost lava sequence, providing a rare opportunity to investigate a time series of the intra-plate volcanism in conjunction with the Pacific plate construction history centered at the triple junction. Logging data results indicate that Tamu Massif was formed during normal polarity periods south of the paleoequator and crossed the equator at some point in the M19–M17 period. Combining these new observations with previous interpretations of the massif's tectonic history, a time series of the latitudinal tectonic motion of a LIP and the underlying Pacific plate during the plateau formation is postulated.

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