Computer Science
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..78..129s&link_type=abstract
Earth and Planetary Science Letters, Volume 78, Issue 1, p. 129-138.
Computer Science
2
Scientific paper
Palaeomagnetic studies are reported from fifty oriented samples (117 specimens) at 10 sites in the eastern Gaspé Peninsula. All sampled lithostratigraphic units are composed of siltstones and sandstones of Devonian age. The Indian Point Formation is of Gedinnian age and the York River and Battery Point Formations of Emsian age. At most of the sites sampled the sedimentary formations are cut by Middle to Late Carboniferous (mean K-Ar age = 300 Ma) diabase dykes which were also sampled. Three components of magnetization were isolated. The most common component A (D = 313°, I= -45°) is present in 8 sites and in all Indian Point and Battery Point sites. Component B (D = 147°, I= 38°) is found in 3 sites. Component B is antiparallel to component A and their mean direction is D = 317°, I=-43° this value is similar to the characteristic remanence (D = 329°, I= -43°) of the dykes. Component C is found mainly in the York River Formation (3 sites, D = 182°, I= 41°). Contrary to component A-B, component C passes (barely) the fold test with a tilt-corrected direction of D = 174°, I= 75° it also passes baked contact tests. Since component C is pre-folding, it is older than Late Devonian (Acadian Orogeny) but may be primary or secondary. Its palaeopole is 109°E, 20°S and it is characterized by a high palaeolatitude (62°S). Since the palaeopole of component A-B is 154°E, 8°N, the APW trajectory moved in the northeast directing during the Lower/Middle Devonian to the Middle/Upper Carboniferous time interval.
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