Seismic volcanostratigraphy of the extrusive breakup complexes in the northeast Atlantic : Implications from ODP/DSDP drilling

摘要: Seismic reflection data calibrated by scientific boreholes have proven the presence of voluminous early Tertiary extrusive volcanic complexes along northeast Atlantic continental margins. facies interpretation representative seismic profiles reveals one or more characteristic units seaward-dipping reflectors (SDR) most margin segments. Other units, including Inner Flows, Lava Delta, Landward and Outer High are also identified regionally. More than 15 sampled complex, recovering subaerial flood basalts, shallow marine hydroclastites, pillow lavas. Most deep holes drilled into Flows unit. However, no well-defined ever been penetrated within complexes. Several not at all, only a few SDR. The nature intrabasement reflectivity is therefore presently poorly constrained. Representative transects across conjugate Southeast Greenland-Hatton Bank margins Jan Mayen Ridge-More Margin reveal gross symmetry, as shown SDR on all In general, however, lack symmetry significant variation in nature, extent, volume apparent. We suggest that largely related to tectonic control emplacement lava flows.