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Oceanography and Atmospheric Sciences and Meteorology
Igneous and Metamorphic Basalts; basement; Cretaceous; geophysical methods; geophysical surveys; igneous rocks; lava; Leg 130; Mesozoic; Ocean Drilling Program; Ontong Java Plateau; Pacific Ocean; pillow lava; reflection methods; seismic methods; surveys; volcanic features; volcanic rocks; West Pacific
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Basement Structure Of The Northern Ontong Java Plateau, Rick A. Hagen, Larry A. Mayer, David Mosher, Loren W. Kroenke, Tom H. Shipley, Edward L. Winterer
Basement Structure Of The Northern Ontong Java Plateau, Rick A. Hagen, Larry A. Mayer, David Mosher, Loren W. Kroenke, Tom H. Shipley, Edward L. Winterer
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Site surveys conducted in conjunction with Leg 130 on the Ontong Java Plateau reveal a strong seismic reflector at 0.8 to 1.0 s below the seafloor that drilling at Sites 803 and 807 confirmed is Cretaceous basalt. This reflector is generally smooth, except for the northeastern margin of the plateau, where it forms a series of small, irregularly shaped depressions. Correlatable reflectors present at the bottom of the depressions are also present on the adjacent highs, suggesting that these depressions are original volcanic topography. A strong sub-basalt reflector occurs on many seismic profiles on the northeastern portion of the plateau. …