P-Wave Modelling of the East Greenland Volcanic Margin North of the Jan Mayen Fracture Zone

• Main Authors: Schroeder, Michael, Jokat, Wilfried
• Format: Conference Object
• Language: unknown
• Published: 2005
• Subjects: Greenland; Jan Mayen; Jan Mayen Fracture Zone; Lofoten; Norway; East Greenland
• Online Access: https://epic.awi.de/id/eprint/12680/; https://epic.awi.de/id/eprint/12680/1/Sch2005q.pdf; https://hdl.handle.net/10013/epic.23093; https://hdl.handle.net/10013/epic.23093.d001

P-wave modelling of the continent ocean transition of the East Greenland volcanic margin north of Jan Mayen Fracture ZoneThe volcanic rifted margin off Norway between the Jan Mayen and Greenland-Senya Fracture Zone is a very well explored and studied by academia and industry. The geophysical and geological data reveal important vertical and lateral variations in crustal structure and composition resulting from a complex history of rifting prior to and during the Late Cretaceous- Early Tertiary rift episodes that led to break-up and volcanic margin formation. OBS data modelling on the Vøring and Lofoten margin show a high velocity body in the lower crust along and across the margin with varying thickness.The continent ocean transition off East Greenland is less well known. The existence of a conjugate volcanic feature to the Vøring Marginal High at the Norwegian margin is of special interest. Gravity and magnetic data off East Greenland do not support the presence of such a feature.Although MCS and potential field data exist along the East Greenland margin, the data density is insufficient to image lateral variations in deeper structure, which can be expected from comparison with the conjugate margin off Norway.In 2003, new seismic refraction data were acquired on four profiles by RV Polarstern to investigate the deep structure of the east Greenland continental margin and its transition from continental to oceanic crust. Most transects were located in the prolongations of the fjord profiles of earlier investigations between 72°N and 76°N. Parallel to the deployment of ocean-bottom-hydrophones and seismometers, MCS data were recorded with a 3000m streamer along the 300 - 450 km long profiles. Recording units in the onshore prolongation of the seismic transects, a high resolution aeromagnetic survey and ship borne gravity measurements, yielded new information on the source of the pronounced negative magnetic anomaly that runs parallel to the shore. All recorded data are of excellent quality and provide a clear and ...