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Abstract:

Geomagnetic directions recorded in a lower Jurassic stratigraphic sequence that outcrops at the Breggia Gorge are analyzed. A new method to identify directions suitable for calculating a time-averaged dipolar geomagnetic direction has been applied to calculate a hypothetical early Jurassic geocentric axial dipole. The data were separated to identify normal/reverse directions, corresponding to periods of stable field, and intermediate directions. From an analysis of the data in the palaeogeographic coordinates of the Breggia Gorge at the time of the acquisition of the remanence, it is suggested that polarity transitions in the early Jurassic behaved in a similar manner to that described for late Cenozoic reversals, with the VGPs preferentially following longitudinal paths. The preferred paths coincide with a time-averaged location of the Jurassic subduction area of Pangea. This agreement could indicate a connection between the geometry of the reversals and the subduction zones. An analysis to test whether both N/R and intermediate directions have similar preferred distributions suggests that the underlying structure of the early Jurassic geomagnetic field was similar to that observed for the late Cenozoic. The dispersion of directions with inclinations around O° is higher than those belonging to N/R polarity directions, suggesting that there was an enhancement of fluctuations of the geomagnetic field during intermediate states in the early Jurassic. © 2001 Elsevier Science B.V.

Registro:

Documento: Artículo
Título:Analysis of the early Jurassic geomagnetic data recorded at the Breggia Gorge (Ticino, Switzerland)
Autor:Vizán, H.; Van Zele, M.A.
Filiación:Consejo Nacional de Investigaciones Cientificas y Técnicas, Buenos Aires, Argentina
Departamento de Cs. Geológicas, Facultad de Ciencias Exactas y Naturales (U.B.A.), Ciudad Universitaria, Pabellón 2, 1428 Buenos Aires, Argentina
Palabras clave:Alps; Early jurassic; Geomagnetism; Polarity reversals; Switzerland; Jurassic; magnetic reversal; paleomagnetism; Switzerland
Año:2001
Volumen:125
Número:1-4
Página de inicio:19
Página de fin:29
DOI: http://dx.doi.org/10.1016/S0031-9201(01)00207-2
Título revista:Physics of the Earth and Planetary Interiors
Título revista abreviado:Phys. Earth Planet. Inter.
ISSN:00319201
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v125_n1-4_p19_Vizan

Referencias:

  • Butler, R.F., (1992) Paleomagnetism: Magnetic Domains to Geological Terranes, , Blackwell Scientific, MA, USA
  • Clement, B.M., Geographical distribution of transitional VGPs: Evidence for non-zonal equatorial symmetry during the Matuyama-Brunhes geomagnetic reversal (1991) Earth Planet. Sci. Lett, 104, pp. 48-58
  • Constable, C., Link between geomagnetic reversal paths and secular variation of the field over the past 5 million years (1992) Nature, 358, pp. 230-233
  • Cox, A.V., Hart, B.R., (1986) Plate Tectonics: How It Works, , Blackwell Scientific, Palo Alto
  • Creer, K.M., The dispersion of the geomagnetic field due to secular variation and its determination for remote times from paleomagnetic data (1962) J. Geophys. Res, 67, pp. 3461-3476
  • Edel, J.B., Duringer, P., The apparent polar wander path of the European plate in upper triassic-lower Jurassic times and the liassic intraplate fracturing of Pangaea: New palaeomagnetic constraints from NW France and SW Germany (1997) Geophys. J. Int, 128, pp. 331-344
  • Fisher, R.A., Dispersion on a sphere (1953) Proc. R. Soc. A, 217, pp. 295-305
  • Galbrun, B., Gabilly, J., Rasplus, L., Magnetostratigraphy of the Toarcian stratotype sections at Thouars and Airvault (Deux-Serves, France) (1988) Earth Planet. Sci. Lett, 87, pp. 453-462
  • Garnero, E.J., Revenaugh, J., Williams, Q., Lay, T., Kellog, L.H., Ultralow velocity zone at the core-mantle boundary (1998) Geodynamics Series, The Core-Mantle Boundary Region, 28, pp. 319-334. , Gurnis, M., Wysession, M., Knittle, E., Buffet, B. (Eds.), American Geophysical Union, Washington, DC
  • Gradstein, F.M., Agterberg, F.P., Ogg, J.G., Hardenbol, J., van Veen, P., Thierry, J., Huang, Z., A Mesozoic time scale (1994) J. Geophys. Res, 99, pp. 24051-24074
  • Gubbins, D., Geomagnetic polarity reversals: A connection with secular variation and core-mantle interaction? (1994) Rev. Geophy, 32, pp. 61-83
  • Gubbins, D., Interpreting the paleomagnetic field (1998) Geodynamics Series, the Core-Mantle Boundary Region, 28, pp. 167-181. , Gurnis. M., Wysession. M., Knittle, E., Buffet, B. (Eds.), American Geophysical Union, Washington, DC
  • Gubbins, D., Coe, R., Longitudinally confined geomagnetic reversal paths from non-dipolar transition fields (1993) Nature, 362, pp. 51-53
  • Gubbins, D., Love, J.J., Preferred VGP paths during geomagnetic polarity reversals: Symmetry considerations (1998) Geophys. Res. Lett, 25, pp. 1079-1082
  • Hijab, B.R., Tarling, D.H., Lower Jurassic palaeomagnetic results from Yorkshire, England, and their implications (1982) Earth Planet. Sci. Lett, 60, pp. 147-154
  • Hoffman, K.A., Dipolar reversal states of the geomagnetic field and core-mantle dynamics (1992) Nature, 359, pp. 789-794
  • Horner, F., Heller, F., Lower Jurassic magnetostratigraphy at the Breggia Gorge (Ticino, Switzerland) and Alpe Turati (Como, Italy) (1983) Geophys. J.R. Astronom. Soc, 73, pp. 705-718
  • Iorio, M., Tarling, D.H., D'Argenio, B., The magnetic polarity stratigraphy of a Hauterivian/Barremian carbonate sequence from Southern Italy (1998) Geophys. J. Int, 134, pp. 13-24
  • Jurdy, D.M., Van der Voo, R., A method for the separation of true polar wander and continental drift including results for the last 55 million years (1974) J. Geophys. Res, 79, pp. 2945-2952
  • Kyvalová, H., Cadek, O., Yuen, D.A., Correlation analysis between subduction in the last 180 million years and lateral seismic structure of the lower mantle: Geodynamical implications (1995) Geophys. Res. Lett, 22, pp. 1281-1284
  • Laj, C., Mazaud, A., Weeks, R., Fuller, M., Herrero-Berbera, E., Geomagnet. Reversal paths (1991) Nature, 351, p. 447
  • Langerais, C.G., van Hoof, A.A.M., Rochette, P., Longitudinal confinement of geomagnetic reversal paths as a possible sedimentary artefact (1992) Nature, 358, pp. 226-230
  • Lottes, A.L., Rowley, D.B., Early and late Permian reconstructions of Pangaea (1990) Palaeozoic Palaeogeography and Biogeography, pp. 383-395. , McKerrow, W.S., Scotese, C.R. (Eds.), Geological Society of London Memoir 12, London
  • Love, J.J., Paleomagnetic volcanic data and geomagnetic regularity of reversals and excursions (1998) J. Geophys. Res, 103, pp. 12435-12452
  • Love, J.J., On the anisotropy of secular variation deduced from paleomagnetic volcanic data (2000) J. Geophys. Res, 105, pp. 5799-5816
  • McElhinny, M.W., Merrill, R.T., Geomagnetic secular variation over the past 5 million years (1975) Rev. Geophys. Space Phys, 13, pp. 687-708
  • McFadden, P.L., A new fold test for palaeomagnetic studies (1990) Geophys. J. Int, 103, pp. 163-269
  • McFadden, P.L., Reid, A.B., Analysis of palaeomagnetic inclination data (1983) Geophys. J. R. Astronom. Soc, 69, pp. 307-319
  • McFadden, P.L., Merrill, R., McElhinny, M., Lee, S., Reversals of the earth's magnetic field and temporal variations of the dynamo families (1991) J. Geophys. Res, 96, pp. 3923-3933
  • McFadden, P.L., Barton, C.E., Merrill, R., Do virtual geomagnetic poles follow preferred paths during geomagnetic reversals? (1993) Nature, 361, pp. 342-344
  • Morgan, J.W., Hotspot tracks and the early rifting of the Atlantic (1983) Tectonophysics, 94, pp. 123-139
  • Müller, R.D., Royer, J., Lawver, L.A., Revised plate motions relative to hotspots from combined Atlantic and Indian Ocean hotspot tracks (1993) Geology, 21, pp. 275-278
  • Prévot, M., Camps, P., Absence of preferred longitude sectors for poles from volcanic records of geomagnetic reversals (1993) Nature, 366, pp. 53-57
  • Richards, M.A., Engebretson, D.C., Large-scale mantle convection and the history of subduction (1992) Nature, 355, pp. 437-440
  • Tarling, D.H., Iorio, M., D'Argenio, B., Geomagnetic long-term secular variation in Italian lower Cretaceous shallow-water carbonates (1999) Geophys. J. Int, 137, pp. 713-722
  • Valet, J.P., Laj, C., Tucholka, P., High-resolution sedimentary record of a geomagnetic reversal (1986) Nature, 322, pp. 27-32
  • Vandamme, D., A new method to determine paleosecular variation (1994) Phys. Earth Planet. Interiors, 85, pp. 131-142
  • Van der Voo, R., (1993) Paleomagnetic of the Atlantis, Tethys and Iapetus Oceans, , Cambridge University Press, Cambridge
  • Vizán, H., Paleomagnetism of the lower Jurassic Lepá and Osta Arena formations, Argentine Patagonia (1998) J. South Am. Earth Sci, 11, pp. 333-350
  • Vizán, H., Van Zele, M.A., Analysis of a lower Jurassic geomagnetic reversal based on a model that relates transitional fields to variations of flux on the core surface (1995) Stud. Geophys. Et Geodaetica, 39, pp. 177-188
  • Vizán, H., Somoza, R., Orgeira, M.J., Vásquez, C.A., Mena, M., Vilas, J.F., Late Palaeozoic-Mesozoic geomagnetic reversal paths and core-mantle boundary (1994) Geophys. J. Int, 117, pp. 819-826
  • Weedon, G.P., Jenkyns, H.C., Cyclostratigraphy and the early Jurassic timescale: Data from the Belemnite Marls, Dorset, Southern England (1999) Geol. Soc. Am. Bull, 111, pp. 1823-1840
  • Wen, L., Anderson, D.L., The fate of slabs inferred from 130 million years of subduction and seismic tomography (1995) Earth Planet. Sci. Lett, 133, pp. 185-198
  • Wilson, R.L., Dagley, P., McCormack, A.G., Palaeomagnetic evidence about the source of the geomagnetic field (1972) Geophys. J. R. Astronom. Soc, 28, pp. 213-224
  • Zhu, R., Laj, C., Mazaud, A., The Matuyama-Brunhes and upper Jaramillo transitions recorded in a Loess Section at Weinan, North-central China (1994) Earth Planet. Sci. Lett, 125, pp. 143-158

Citas:

---------- APA ----------
Vizán, H. & Van Zele, M.A. (2001) . Analysis of the early Jurassic geomagnetic data recorded at the Breggia Gorge (Ticino, Switzerland). Physics of the Earth and Planetary Interiors, 125(1-4), 19-29.
http://dx.doi.org/10.1016/S0031-9201(01)00207-2
---------- CHICAGO ----------
Vizán, H., Van Zele, M.A. "Analysis of the early Jurassic geomagnetic data recorded at the Breggia Gorge (Ticino, Switzerland)" . Physics of the Earth and Planetary Interiors 125, no. 1-4 (2001) : 19-29.
http://dx.doi.org/10.1016/S0031-9201(01)00207-2
---------- MLA ----------
Vizán, H., Van Zele, M.A. "Analysis of the early Jurassic geomagnetic data recorded at the Breggia Gorge (Ticino, Switzerland)" . Physics of the Earth and Planetary Interiors, vol. 125, no. 1-4, 2001, pp. 19-29.
http://dx.doi.org/10.1016/S0031-9201(01)00207-2
---------- VANCOUVER ----------
Vizán, H., Van Zele, M.A. Analysis of the early Jurassic geomagnetic data recorded at the Breggia Gorge (Ticino, Switzerland). Phys. Earth Planet. Inter. 2001;125(1-4):19-29.
http://dx.doi.org/10.1016/S0031-9201(01)00207-2