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Marine Geophysical Researches

, Volume 23, Issue 3, pp 247–270 | Cite as

Early Eocene sea floor spreading and continent-ocean boundary between Jan Mayen and Senja fracture zones in the Norwegian-Greenland Sea

  • Filippos Tsikalas
  • Olav Eldholm
  • Jan Inge Faleide
Article

Abstract

Sea floor spreading anomalies in the Lofoten-Greenland basins reveal an unstable plate boundary characterized by several small-offset transforms for a period of ∼4 m.y. after opening. North of the Jan Mayen Fracture Zone, integrated analysis of magnetic and seismic data also document a distinct, persistent magnetic anomaly associated with the continent-ocean boundary and a locally, robust anomaly along the inner boundary of the break-up lavas. These results provide improved constraints on early opening plate reconstructions, which include a new anomaly 23-to-opening pole of rotation yielding more northerly relative motion vectors than previously recognized; and a solution of the enigmatic, azimuthal difference between the conjugate Eocene parts of the Greenland-Senja Fracture Zone if the Greenland Ridge is considered a continental sliver. The results confirm high, 2.36–2.40 cm yr−1, early opening spreading rates, and are consistent with the start of sea floor spreading during Chron 24r. The potential field data along the landward prolongations of the Bivrost Fracture Zone suggest that its location is determined by a Mesozoic transfer system which has acted as a first-order, across-margin tectono-magmatic boundary between the regional Jan Mayen and Greenland-Senja Fracture Zone systems, greatly influencing the pre-, syn- and post-breakup margin development.

sea floor spreading continent-ocean boundary plate reconstructions Norwegian-Greenland Sea North Atlantic 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Filippos Tsikalas
    • 1
  • Olav Eldholm
    • 2
  • Jan Inge Faleide
    • 1
  1. 1.Department of GeologyUniversity of OsloBlindernNorway
  2. 2.Department of Earth ScienceUniversity of BergenBergenNorway

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