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    Lateral continuity of basement seismic reflections in 15 Ma ultrafast-spreading crust at ODP Site 1256

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    manuscript-8.pdf (2.019Mb)
    Date
    2010-07-25
    Author
    Nag, Sreeja  Concept link
    Swift, Stephen A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4808
    As published
    https://doi.org/10.1007/s11001-011-9122-4
    Keyword
     East Pacific Rise; Vertical seismic profiling 
    Abstract
    The Ocean Drilling Program (ODP) initiated drilling at Site 1256D in the Guatemala Basin, about 1000km off the East Pacific Rise to penetrate plutonic rocks, anticipated to be relatively shallow in this region, formed at an ultra-fast spreading rate. IODP Expedition E312 successfully drilled into gabbros at ~ 1150m in basement. Multi-channel seismic traces show weak laterally coherent sub-basement reflections at borehole depths. Synthetic reflectivity seismograms were computed using a Ricker wavelet and impedance profiles from borehole sonic logs. These seismograms show significant sub-basement amplitude peaks. A zero-offset vertical seismic profile, shot on E312, was processed to investigate the authenticity of these reflections and their relationship to borehole geology. A dual scheme of the median filtering and F-K dip filtering was used. Tests with synthetic seismograms indicate the approach is effective at reasonable SNR levels. Downgoing energy is clearly identified but negligible upgoing energy is visible over random noise. These results indicate that lava flows and igneous contacts in upper ocean crust have significant topography on lateral scales less than the Fresnel Zone (~ 300m) due to igneous and tectonic processes.
    Description
    Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Marine Geophysical Research 32 (2011): 429-439, doi:10.1007/s11001-011-9122-4.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Nag, Sreeja, Swift, Stephen A., "Lateral continuity of basement seismic reflections in 15 Ma ultrafast-spreading crust at ODP Site 1256", 2010-07-25, https://doi.org/10.1007/s11001-011-9122-4, https://hdl.handle.net/1912/4808
     

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