Expanding spread profile at the northern Jan Mayen Ridge |
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| Authors: | BÅRD JOHANSEN OLAV ELDHOLM MANIK TALWANI PAUL L STOFFA PETER BUHL |
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| Institution: | Norwegian Petroleum Directorate, Harstad, Norway, or: Department of Geology, University of Oslo, Norway;Department of Geology, University of Oslo, Norway.;Rice University and Houston Area Research Center, Houston, Texas, U.S.A.;Paul L. Stoffa, Institute for Geophysics and Department of Geological Sciences, University of Texas at Austin, U.S.A.;Peter Buhl, Lamoni-Doherty Geological Observatory, Palisades, New York, U.S.A.;Institute for Geophysics and Department of Geological Sciences, University of Texas at Austin, U.S.A.;Peter Buhl, Lamoni-Doherty Geological Observatory, Palisades, New York, U.S.A.;Lamoni-Doherty Geological Observatory, Palisades, New York, U.S.A. |
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| Abstract: | An expanding spread seismic profile at the central northern Jan Mayen Ridge, ESP-5, has yielded a crustal seismic velocity distribution which is similar to observations from the thinned continental crust at the Norwegian continental margin. The profile reveals a post-early Eocene sedimentary sequence, about 1. 5 km thick, overlying 1 km of volcanic extrusives and interbedded sediments. Below, there are about 3 km of pre-opening sediments above the seismic basement. The results indicate that the main ridge block is underlain by a thinned crust, possibly only 13.5 km thick. The results are compatible with a continental nature for the main ridge complex. |
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