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- W2056735302 abstract "The paleogeography of northeastern Spain is addressed in a detailed paleomagnetic study of Siluro‐Devonian boundary sediments from the Catalan Coastal Ranges (CCR) at Santa Creu d'Olorda, Barcelona, and the eastern Pyrenees at Baèn. The sequences studied are all well dated biostratigraphically and have undergone only very minor deformation, mainly during the late Carboniferous, and extremely low grades of metamorphism (anchizone or less). After stepwise thermal demagnetisation of samples and principal component analysis of the data, up to two paleomagnetic directions can be clearly identified after removal of a present‐day magnetic overprint. The first component (labeled B) is identified only in samples from the CCR with intermediate unblocking temperature spectra (300°–400°C). An overall mean direction of 187°/−03°, semi angle of cone of 95% confidence α 95 = 9.0°, and precision parameter k = 43.1 in situ, and 195°/03° α 95 = 24.4°, and k = 7.1 (51 samples at seven sites) after bedding correction is obtained for B. The exact age of this secondary component is uncertain, but when compared to published paleomagnetic data, a late Carboniferous to Early Triassic age could be inferred. A stable endpoint direction (labeled C) can be identified between 400° and 600°C in samples from both regions. For the CCR it is southwesterly directed with intermediate inclination values in situ, and yields a mean direction of 208°/48°, α 95 = 12.8° and k = 28.4 (six sites) after bedding correction. It passes the fold test, is considered to be primary in origin, and is thus indicative of the Siluro‐Devonian paleofield direction in the CCR. In the Pyrenean samples the C direction is northwesterly directed in situ, with a mean direction of 240°/51°, α 95 = 6.5° and k = 86.5 (seven sites) after bedding correction. Although there is a clear improvement in grouping of these site mean directions, this is not significant at the 95% level of confidence. Combining the site mean directions obtained for component C from both regions yields an overall mean direction of 224°/51°, α 95 = 8.5° and k = 24.6 (13 sites) after bedding correction. The improvement in grouping is significant at the 99% level of confidence at 90% unfolding, reinforcing the interpretation that this is a primary magnetisation. Adopting the reversed polarity option, the inclination value obtained translates into paleolatitudes of 30°S, placing NE Spain in the same latitudinal belt as the Armorican Massif and the Barrandian terrane of the Bohemian Massif (i.e., the Armorican Terrane Assemblage) in latest Silurian/earliest Devonian times." @default.
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- W2056735302 date "2000-10-10" @default.
- W2056735302 modified "2023-10-01" @default.
- W2056735302 title "Paleomagnetism of Siluro-Devonian sequences, NE Spain" @default.
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- W2056735302 doi "https://doi.org/10.1029/2000jb900111" @default.
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