Physics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...30..374p&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 30, Issue 4, p. 374-384.
Physics
Scientific paper
Cambro-Ordovician redbeds have been sampled in the Buçaco syncline, an Hercynian structure of northern Portugal. Secondary and characteristic components of magnetisation have been recovered for samples from seven sites on the same limb of the syncline using thermal and chemical demagnetisation techniques, suggesting both pre- and post-tectonic magnetisations. The secondary magnetisations include: (1) the present Earth field direction with normal and reverse polarity, interpreted as a stable Quaternary magnetisation; and (2) a group with only normal polarities, of constant inclination (50°) but variable declination (320-350°). The mean inclination of this second group suggests a Cretaceous origin, and acquisition of magnetisation during the opening of the Bay of Biscay could explain the data.
There are two periods of sedimentation after deposition of the Cambro-Ordovician redbeds that correspond to the acquisition of the secondary remanent magnetisations. We propose a process involving the fossilisation of alteration products immediately preceding sedimentation in order to explain this correlation.
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