Paleomagnetic investigation of Quaternary West Eifel volcanics (Germany): indication for increased volcanic activity during geomagnetic excursion/event?

Main Article Content

H. Bohnel
N. Reismann
G. Jager
U. Haverkamp
J.F.W. Negendank
H.-U. Schmincke

Abstract

Eighty-five sites of West Eifel volcanoes were investigated paleomagnetically, giving 64 independent virtual geomagnetic poles (VGP). The VGP distribution is strongly asymmetric: about 30% of the VGPs have latitudes below 60° N and are confined to the longitude sector between 30° E and 120° E. This leads to a mean VGP situated at 74.0° N/63.9° E, deviating significantly from the north geographical pole. The VGP distribution is non-Fisherian, but the radial component is rather similar to that observed for Tertiary to Quaternary Icelandic lavas. Tectonic, petrographic, rock magnetic properties and secular variation do not seem to be responsible for the anomalous VGP positions. We propose that the volcanoes with anomalous VGPs erupted in a short period during an excursion or event of the Earth's magnetic field.


Google Scholar           ARK: https://n2t.net/ark:/88439/y098537


Permalink: https://geophysicsjournal.com/article/138


 

Article Details

How to Cite
Bohnel, H., N. Reismann, G. Jager, U. Haverkamp, J.F.W. Negendank, and H.-U. Schmincke. 1987. “Paleomagnetic Investigation of Quaternary West Eifel Volcanics (Germany): Indication for Increased Volcanic Activity During Geomagnetic excursion/Event?”. Journal of Geophysics 62 (1), 50-61. https://journal.geophysicsjournal.com/JofG/article/view/138.
Bookmark and Share

References

Ade-Hall, J.M., Khan, M.A., Dagley, P., Wilson, R.L. (1982) A detailed opaque petrological and magnetic investigation of a single Tertiary lava from Skye, Scotland. Part I and II. Geophys. J. R. Astron. Soc. 16, 374-399, 1968 Bohnel, H., Kohnen, H., Negendank, J., Schmincke, H.-U.: Paleomagnetism of Quaternary volcanics of the East-Eifel, Germany. J. Geophys. 51:29-37

Bogaard, P. van den, Hall, C.M., York, D., Schmincke, H.-U. (1986) High precision single grain 40 Ar/39 Ar laser ages from Pleistocene tephra deposits, East Eifel volcanic field, FRG. Eos 67(44):1248

Buchel, G., Lorenz, V. (1982) Zurn Alter des Maarvulkanismus der Westeifel. Neues Jb. Geol. Palaont. Abh. 163:1-22

Buchel, G., Mertes, H. (1982) Die Eruptionszentren des Westeifeler Vulkanfeldes. Z. Dt. geol. Ges. 133:409-429

Collinson, D.W. (1983) Methods in rock magnetism and palaeomagnetism. Chapman & Hall, London-New York

Day, R. (1977) TRM and its variation with grain size. J. Geomagn. Geoelectr. 29:233-265

Day, R., Fuller, M., Schmidt, V.A. (1977) Hysteresis properties oftitanomagnetites. Grain-size and compositional dependence. Phys. Earth Planet. Inter. 13:260-267

Duda, A., Schmincke, H.-U. (1985) Polybaric evolution of alkali basalts from the West Eifel: evidence from green-core clinopyroxenes. Contr. Mineral. Petrol. 91:340-353

Dunlop, D.J. (1981) The rock magnetism of fine particles. Phys. Earth Planet. Inter. 26:1-26

Fisher, R.A. (1953) Dispersion on a sphere. Proc. R. Soc. London A-127:295-305

Haverkamp, U. (1980) Palaomagnetische U ntersuchungen an quartaren Vulkaniten der Westeifel. Diploma thesis, Inst. Geophys. Munster

Hoffman, K.A., Day, R. (1978) Separation of multi-component NRM: a general method. Earth Planet. Sci. Lett. 40:433-438

Illies, H.J., Prohdehl, C., Schmincke, H.-U. (1979) The Quaternary uplift of the Rhenish Shield in Germany. Tectonophysics 61:197-225

Jacobs, I.A. (1984) Reversals of the earth's magnetic field. Adam Hilger Ltd., Bristol

Jager, G. (1982) Palaomagnetische Untersuchungen im quartaren Vulkanfeld der Westeifel. Diploma thesis, Inst. Geophys. Munster

Kirshvink, J.L. (1980) The least-squares line and plane and the analysis of palaeomagnetic data. Geophys. J.R. Astron. Soc. 62:699-718

Kohnen, H., Westkamper, H. (1978) Palaeosecular variation studies of the Brunhes epoch in the volcanic province of the East-Eifel, Germany. J. Geophys. 44:545-555

Kristjansson, J., McDougall, I. (1982) Some aspects of the late Tertiary geomagnetic field in Iceland. Geophys. J.R. Astron. Soc. 68:273-294

Likhite, S.D., Radhakrishnamurty, C., Sasharabudhe, P.W. (1963) Alternating current electromagnet type hysteresis loop tracer for minerals and rocks. Rev. Sci. Instr. 36:1558-1560

Lippolt, H.J., Fuhrmann, U. (1981) Isotopische Altersbestimmungen an tertiaren und quartaren Vulkaniten des Rheinischen Schildes. DFG Protokoll 5. Kolloquium Schwerpunkt Vertikalbewegungen, Neustadt 1980:171-176

Mertes, H. (1983) Aufbau und Genese des Westeifeler Vulkanfeldes. Bochumer geol. and geotechn. Arb. 9, Bochum

Mertes, H., Schmincke, H.-U. (1983) Age distribution of volcanoes in the West Eifel. N. Jb. Geol. Palaont. Abh. 166:260-293

Mertes, H., Schmincke, H.U. (1985) Mafic potassic lavas of the Quaternary West Eifel volcanic field. I. Major and trace elements. Contrib. Mineral. Petrol. 89:330-345

Molyneaux, L. (1971) A complete result magnetometer for measuring the remanent magnetization of rocks. Geophys. J. R. Astron. Soc. 24:429-433

Reismann, N. (1985) AbschlieBende palaomagnetische Untersuchungen der Verteilung der virtuellen geomagnetischen Pole fur das quartare Vulkanfeld der Westeifel. Diploma thesis, Inst. Geophys. Munster

Sachtleben, T., Seek, H.A. (1981) Chemical control on Al-solubility in orthopyroxene and its implications on pyroxene geothermometry. Contrib. Mineral. Petrol. 78:157-165

Schmincke, H.-U. (1982) Vulkane und ihre Wurzeln. Rhein. Westf. Akadem. Wiss., Westd. Verl. Opladen, Vortrag N 315:35-78

Schmincke, H.-U., Lorenz, V., Seek, H.A. (1983) The Quaternary Eifel volcanic fields. In: Fuchs, K. et al. (Eds.) Mode and mechanics of the uplift of the Rhenisch Shield: a case history, pp. 139-151. Springer Verlag, Heidelberg-New York-Tokyo

Stosch, H.G., Seek, H.A. (1980) Geochemistry and mineralogy of two spinel peridotite suites from Dreiser Weiher, West Germany. Geochim. Cosmochim. Acta 44:457-470

Symons, D.T.A., Stupavsky, M. (1974) A rational palaeomagnetic stability index. J. Geophys. Res. 79:1718-1720

Wilson, R., Haggerty, S.E. (1966) Reversals of the earth's magnetic field. Endeavour 25:103-109

Zijderveld, J.D.A. (1967) A.c. demagnetization of rocks: analysis of results. In: Collinson, D.W., Creer, K.M., Runcorn, S.K. (Eds.) Methods in palaeomagnetism. Elsevier, Amsterdam