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Site 642, drilled during Leg 104 of the Ocean Drilling Program, is located near the outer margin of the Wring Plateau in the Norwegian Sea. One of the primary objectives of the leg was to examine the nature of the dipping reflectors which characterize the outer margin of the Plateau, near the continent/ocean transition (Hinz and Weber, 1976; Hinz and Schluter, 1978; Talwani, 1978; Eldholm et al., 1979; Talwani et al., 1981). Reflectors stratigraphically above the base reflector K were interpreted by most investigators as a thick dipping series of lavas which were erupted before, or during, the initial stages of the formation of the Norwegian Sea (Mutter et al., 1982; Talwani et al., 1983; Hinz et al., 1984). This interpretation was supported by the results from Site 642, where drilling penetrated a 310-m thick cover of Cenozoic hemipelagic sediments overlying a 760-m succession of upper series lavas above reflector K. Although 142 m of lower series flows were drilled below this reflector, the base of the lava succession was not reached, and the nature of the crustal section beneath the flows is unknown. In addition, the mode of formation of the pile and the origin of the dipping structure is uncertain. In this short note we review the available evidence on the nature of the Vriring Plateau lavas. We then briefly discuss critical features of comparable subaerial lava piles exposed on other continental margins in the North Atlantic and in Iceland. Finally, we comment on the nature of the continent/ocean transition and propose a model to explain the geometry of the pile.

A Listric Fault Model for the Formation of the Dipping Reflectors Penetrated during the Drilling of Hole 642E, ODP Leg 104