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Controls on the tectono-magmatic evolution of a volcanic transform margin: the Vøring Transform Margin, NE-Atlantic

Controls on the tectono-magmatic evolution of a volcanic transform margin: the Vøring Transform Margin, NE-Atlantic
Controls on the tectono-magmatic evolution of a volcanic transform margin: the Vøring Transform Margin, NE-Atlantic
Ocean bottom seismograph (OBS), multichannel seismic and potential field data reveal the structure of the Vøring Transform Margin (VTM). This transform margin is located at the landward extension of the Jan Mayen Fracture Zone along the southern edge of the Vøring Plateau. The margin consists of two distinctive segments. The northwestern segment is characterized by large amounts of volcanic material. The new OBS data reveal a 30–40 km wide and 17 km thick high-velocity body between underplated continental crust to the northeast and normal oceanic crust in the southwest. The southeastern segment of the mar is similar to transform margins elsewhere. It is characterized by a 20–30 km wide transform margin high and a narrow continent-ocean transition. The volcanic sequences along this margin segment are less than 1 km thick. We conclude from the spatial correspondence of decreased volcanism and the location of the fracture zone, that the amount of volcanism was influenced by the tectonic setting. We propose that (1) lateral heat transport from the oceanic lithosphere to the adjacent continental lithosphere decreased the ambient mantle temperature and melt production along the entire transform margin and (2) that right-stepping of the left-lateral shear zone at the northwestern margin segment caused lithospheric thinning and increased volcanism. The investigated data show no evidence that the breakup volcanism influenced the tectonic development of the southeastern VTM.
0025-3235
133-152
Berndt, C.
231544d4-f681-44a2-ae6e-74385e588bf6
Mjelde, R.
e064a104-c41a-4f6d-a7e0-b5cd4ce9205e
Planke, S.
5a1032d0-1883-4b28-bbb1-e457b09c3806
Shimamura, H.
b90beac5-86df-4366-83d3-2e0f2286b1f9
Faleide, J. I.
914700c9-3685-493f-8f77-29ff5479d825
Berndt, C.
231544d4-f681-44a2-ae6e-74385e588bf6
Mjelde, R.
e064a104-c41a-4f6d-a7e0-b5cd4ce9205e
Planke, S.
5a1032d0-1883-4b28-bbb1-e457b09c3806
Shimamura, H.
b90beac5-86df-4366-83d3-2e0f2286b1f9
Faleide, J. I.
914700c9-3685-493f-8f77-29ff5479d825

Berndt, C., Mjelde, R., Planke, S., Shimamura, H. and Faleide, J. I. (2001) Controls on the tectono-magmatic evolution of a volcanic transform margin: the Vøring Transform Margin, NE-Atlantic. Marine Geophysical Researches, 22 (3), 133-152. (doi:10.1023/A:1012089532282).

Record type: Article

Abstract

Ocean bottom seismograph (OBS), multichannel seismic and potential field data reveal the structure of the Vøring Transform Margin (VTM). This transform margin is located at the landward extension of the Jan Mayen Fracture Zone along the southern edge of the Vøring Plateau. The margin consists of two distinctive segments. The northwestern segment is characterized by large amounts of volcanic material. The new OBS data reveal a 30–40 km wide and 17 km thick high-velocity body between underplated continental crust to the northeast and normal oceanic crust in the southwest. The southeastern segment of the mar is similar to transform margins elsewhere. It is characterized by a 20–30 km wide transform margin high and a narrow continent-ocean transition. The volcanic sequences along this margin segment are less than 1 km thick. We conclude from the spatial correspondence of decreased volcanism and the location of the fracture zone, that the amount of volcanism was influenced by the tectonic setting. We propose that (1) lateral heat transport from the oceanic lithosphere to the adjacent continental lithosphere decreased the ambient mantle temperature and melt production along the entire transform margin and (2) that right-stepping of the left-lateral shear zone at the northwestern margin segment caused lithospheric thinning and increased volcanism. The investigated data show no evidence that the breakup volcanism influenced the tectonic development of the southeastern VTM.

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Published date: 2001

Identifiers

Local EPrints ID: 41415
URI: https://eprints.soton.ac.uk/id/eprint/41415
ISSN: 0025-3235
PURE UUID: 77d13b7b-5409-4db4-95a7-a066c2902887

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Date deposited: 06 Sep 2006
Last modified: 17 Jul 2017 15:30

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Contributors

Author: C. Berndt
Author: R. Mjelde
Author: S. Planke
Author: H. Shimamura
Author: J. I. Faleide

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