Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.135.1045t&link_type=abstract
Geophysical Journal International, Volume 135, Issue 3, pp. 1045-1059.
Astronomy and Astrophysics
Astronomy
9
Dykes, Geochronology, Oslo Rift, Palaeomagnetism
Scientific paper
40Ar/39Ar whole-rock and alkali feldspar ages demonstrate that dioritic to monzonitic dykes from Bøverbru and Lunner belong to the youngest recorded magmatic activity in the Oslo Rift region, southeast Norway. These dykes represent the terminal phase of rift and magmatic activity in the Oslo Graben, at the dawn of the Triassic (246-238 Ma).
The Bøverbru and Lunner dyke ages are statistically concordant. However, the palaeomagnetic signature of the Bøverbru dyke is complex, and directions from the margins and the interior of the dyke differ in polarity. Therefore, the new Early Triassic palaeomagnetic pole for Baltica (Eurasia) is exclusively based on the less complex Lunner dykes and contacts (palaeomagnetic pole: latitude=52.9°N, longitude=164.4°E, dp/dm=4.5°/7.3°). The early Triassic palaeomagnetic pole [mean age: 243+/-5 Ma (2σ)] is slightly different from the Upper Carboniferous-Permian (294-274 Ma) and Kiaman-aged poles from the Oslo Rift.
Eide Elizabeth A.
Meert Joe G.
Smethurst Mark A.
Torsvik Trond Helge
Walderhaug Harald J.
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