Palaeomagnetic data bearing on the age of the Ytterøy dyke, central Norway

Details Palaeomagnetic data bearing on the age of the Ytterøy dyke, central Norway Palaeomagnetic data bearing on the age of the Ytterøy dyke, central Norway

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...54..156t&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 54, Issue 1-2, p. 156-162.

Physics

1

Scientific paper

The Ytterøy dyke has a near-isotropic fabric and clearly post-dates Caledonian regional deformation. It has a two-component magnetization structure with a low-blocking temperature component (D = 016°, I = +73°, α95 = 9) removed below 300° C. The high-blocking temperature component (D = 216°, I = -42°, α95 = 8) could be primary in origin. The palaeomagnetically obtained age accords well with an Rb-Sr biotite age of 256 +/- 10 Ma, and it could be argued that intrusion of the Ytterøy dyke was related to extensive Permian rifting and faulting within the Møre Trøndelag Fault Zone. Tentatively we ascribe the previously claimed late Devonian age (K-Ar and 40Ar-39Ar biotite ages) for the Ytterøy dyke as resulting from the presence of excess Ar or alternatively, K loss induced by a later hydrothermal flux.

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