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Applied Arctic Ocean; biogenic processes; bulk density; Cenozoic; clastic rocks; diatomaceous earth; geophysical methods; geophysical surveys; impedance; Leg 104; lithostratigraphy; marine geology; neutron methods; Norwegian Sea; Ocean Drilling Program; oceanography; ODP Site 642; ODP Site 643; porosity; sedimentary rocks; seismic methods; seismograms; silica; stratigraphy; surveys; synthetic seismograms
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Full-Text Articles in Oceanography and Atmospheric Sciences and Meteorology
The Influence Of Biogenic Silica On Seismic Lithostratigraphy At Odp Sites 642 And 643, Eastern Norwegian Sea, Peter Hempel, Larry A. Mayer, Elliot Taylor, Gerhard Bohrmann, Alan Pittenger
The Influence Of Biogenic Silica On Seismic Lithostratigraphy At Odp Sites 642 And 643, Eastern Norwegian Sea, Peter Hempel, Larry A. Mayer, Elliot Taylor, Gerhard Bohrmann, Alan Pittenger
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Drilling at ODP Sites 642 and 643 revealed a 250 m-thick section of diatomaceous Pliocene to Miocene sediments on the outer Vdring Plateau, eastern Norwegian Sea. These biogenic silica-rich sediments have a significantly lower saturated bulk density than the surrounding sediments, causing a decrease in acoustic impedance, which is seismically expressed as a negative polarity reflection. Variations in sonic velocity, the other key parameter in seismic analysis, is only of secondary importance in creating impedance contrasts in our study. Synthetic seismograms were produced from shipboard physical property measurements corrected for in situ conditions. These synthetic seismograms are in good agreement …