Palaeomagnetism of the ophiolite complexes of Meldal, Sør-Trøndelag

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    Publikasjon A palaeomagnetic investigation of the Early-Ordovician middle to late Arenig sheeted dyke complexes of Meldal has revealed a complex multicomponent magneti- zation history. Three components of remanent magnetization were identified on their differing dysbilities, 'L' low stability'I' intermediate and 'H' high stability. The 'L' component is condidered dating i meldal be a recent overprint.

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    The 'I' component corresponds to an in-situ palaeomagnetic pole at By comparison with a reference apparent polar wander APW path for Baltica, 'I' is considered to be an overprint of Jurassic age. The 'H' component with the highest magnetic stability was identified in two block samples from Resfjell.

    In in-situ form it corresponds to a palaeo-pole at 99°E, Both in-situ and tilt-corrected versions of the data fall far away from reference APW paths for Baltica and Laurentia.

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    We suggest that a series of Silurian tectonic rotations, more complicated than the rotation accounted for in our simple tilt- correction procedure, are responsible for this deviation. If the remanence component does indeed pre-date complicated Silurian tectonic rotations, as its deviation from the APW paths suggests, one must consider the possibility of the remanence dating-back to when the sykes were still part of the Iapetus Ocean floor.

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    The palaeolatitude for the dykes implied by the remanence is This choice of polarity minimises the net vertical-axis rotation in this case anticlockwise through degrees or so necessary to restore the pole to reference data sets. The palaeolatitude