RbSr study of dolerite dikes and psammite from the Western Gneiss region of Norway |
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Authors: | Allan G Krill |
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Institution: | Mineralogisk-Geologisk Museum, Sarsgate 1, Oslo 5, Norway |
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Abstract: | The Saetra Nappe, consisting of feldspathic psammite cut by pre-tectonic dolerite dikes, is a distinctive tectonostratigraphic unit of the Western Gneiss Region of Norway. Although the rocks were metamosphosed at amphibolite facies, RbSr whole-rock sf three well preserved dikes a date of with initial , interpreted to record the dike intrusion. Analysis of small psammite samples collected in rows parallel to the foliation and in columns perpendicular to it, indicate that the RbSr isotopic systems were not equilibrated on the whole-rock scale. The Strata Nappe provides evidence of a strong Caledonian deformation/metamorphic event in the Western Gneiss Region of Norway. |
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