- Open Access
Secular variation and reversals in a composite 2.5 km thick lava section in central Western Iceland
Earth, Planets and Space volume 51, pages261–276(1999)
The direction and intensity of primary remanence has been measured in oriented specimens from 367 lava flows of Late Miocene age in Western Iceland. The lavas which were sampled in 8 overlapping profiles, were generally good material for paleomagnetic measurements. In a 2500-m composite section, at least 15 reversals of polarity and several excursions are recorded. The mean remanence direction and other overall paleomagnetic parameters for the present collection of lavas are similar to those found elsewhere in Iceland. The average rate of buildup of this lava pile was rather low and possibly episodic. Hence, correlations to the geomagnetic polarity time scale and to polarity patterns in other composite sections mapped in Iceland are not straightforward.
Alt, J. C., Very low-grade hydrothermal metamorphism of basic igneous rocks, in Low-Grade Metamorphism, edited by M. Frey and D. Robinson, pp. 169–201, Blackwell Science Ltd., Oxford, 1999.
Cande, S. C. and D. V. Kent, Revised calibration of the geomagnetic polarity time scale for the late Cretaceous and Cenozoic, J. Geophys. Res., 100, 6093–6095, 1995.
Dagley, P. and E. A. Lawley, Palaeomagnetic evidence for the transitional behaviour of the geomagnetic field, Geophys. J. R. Astr. Soc., 36, 577–598, 1974.
Hardarson, B. S., J. G. Fitton, R. M. Ellam, and M. S. Pringle, Rift relocation—a geochemical and geochronological investigation of a palaeorift in northwest Iceland, Earth Planet. Sci. Lett., 153, 181–196, 1997.
Jóhannesson, H., Jardlagaskipun og thróun rekbelta á Vesturlandi (English summary: Evolution of rift zones in Western Iceland), Nátturufrædingurinn, 50, 13–31, 1980.
Kristjánsson, L., Notes on paleomagnetic sampling in Iceland, Jökull, 34, 67–76, 1984.
Kristjánsson, L., Some statistical properties of palaeomagnetic directions in Icelandic lava flows, Geophys. J. R. Astr. Soc., 80, 57–71, 1985.
Kristjánsson, L., Investigations on geomagnetic reversals in Icelandic lavas, 1953–78, Terra Nova, 5, 6–12, 1993.
Kristjánsson, L., New palaeomagnetic results from Icelandic Neogene lavas, Geophys. J. Internat., 121, 435–443, 1995.
Kristjánsson, L., On low-latitude virtual geomagnetic poles in Icelandic basalt lava sequences, Phys. Earth Planet. Inter., 1999 (in press).
Kristjánsson, L. and H. Jóhannesson, Variable dispersion of Neogene geomagnetic directions in Iceland, Phys. Earth Planet. Inter., 56, 124–132, 1989.
Kristjánsson, L. and H. Jóhannesson, Stratigraphy and paleomagnetism of the lava pile south of Isafjardardjup, NW-Iceland, Jökull, 44, 3–16, 1996.
Kristjánsson, L. and G. Jónsson, Aeromagnetic results and the presence of an extinct rift zone in western Iceland, J. Geodyn., 25, 99–108, 1998.
Kristjánsson, L. and I. McDougall, Some aspects of the Late Tertiary geomagnetic field in Iceland, Geophys. J. R. Astr. Soc., 68, 273–294, 1982.
Kristjánsson, L., I. B. Fridleifsson, and N. D. Watkins, Stratigraphy and palaeomagnetism of the Esja, Eyrarfjall and Akrafjall mountains, SW-Iceland, J. Geophys., 47, 31–42, 1980.
Kristjánsson, L., H. Jóhannesson, and I. McDougall, Stratigraphy, age and paleomagnetism of Langidalur, Northern Iceland, Jökull, 42, 31–44, 1993.
Labrecque, J. L., D. V. Kent, and S. C. Cande, Revised geomagnetic polarity time scale for Late Cretaceous and Cenozoic time, Geology, 5, 330–335, 1977.
McDougall, I., K. Sæmundsson, H. Jóhannesson, N. D. Watkins, and L. Kristjánsson, Extension of the geomagnetic polarity time scale to 6.5 m.y. K-Ar dating, geological and paleomagnetic study of a 3,500 m lava succession in western Iceland, Bull. Geol. Soc. Am., 88, 1–15, 1977.
McDougall, I., L. Kristjánsson, and K. Sæmundsson, Magnetostratigraphy and geochronology of northwest Iceland, J. Geophys. Res., 89, 7029–7060, 1984.
Moorbath, S., H. Sigurdsson, and R. Goodwin, K-Ar ages of the oldest exposed rocks in Iceland, Earth Planet. Sci. Lett., 4, 197–205, 1968.
Pringle, M. S., B. S. Hardarson, L. Kristjánsson, and H. Jóhannesson, Decrease in rate of crustal production from established to dying rift: examples from Western Iceland, Eos, 78(46, Suppl.), F656, 1997.
Sæmundsson, K., L. Kristjánsson, I. McDougall, and N. D. Watkins, K-Ar dating, geological and paleomagnetic study of a 5-km lava succession in northern Iceland, J. Geophys. Res., 85, 3628–3646, 1980.
Walker, G. P. L., Geology of the Reydarfjördur area, eastern Iceland, Quart. J. Geol. Soc. London, 114, 367–393, 1959.
Walker, G. P. L., Compound and simple lava flows and flood basalts, Bull. Volc., 35, 579–590, 1971.
Watkins, N. D., I. McDougall, and L. Kristjánsson, Miocene and Pliocene secular variation in the Borgarfjördur area of Western Iceland, Geophys. J. R. Astron. Soc., 49, 609–632, 1977.
Wilson, R. L., N. D. Watkins, T. Einarsson, T. Sigurgeirsson, S. E. Haggerty, P. J. Smith, P. Dagley, and A. G. McCormack, Palaeomagnetism often lava sequences from south-western Iceland, Geophys. J. R. Astron. Soc., 29, 459–471, 1972.
About this article
Cite this article
Kristjánsson, L., Jóhannesson, H. Secular variation and reversals in a composite 2.5 km thick lava section in central Western Iceland. Earth Planet Sp 51, 261–276 (1999). https://doi.org/10.1186/BF03352230
- Rift Zone
- Secular Variation
- Polarity Zone
- Composite Section