Rockmagnetic studies of Upper Jurassic limestones from Southern Germany
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Vols. 1-18 (1924-1944), ISSN 0044-2801
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Abstract
Acquisition of isothermal remanent magnetization (IRM) and the behaviour of IRM during high and low temperature treatment indicate that magnetite, goethite and minor quantities of hematite determine the magnetic properties of the Upper Jurassic limestones in Southern Germany. The direction of natural remanent magnetization (NRM) of magnetite is of detrital, synsedimentary origin, whereas the goethite, although its NRM is extremely stable against AF cleaning, has been magnetized only partly during the Jurassic. Part of the goethite NRM is interpreted to be of Tertiary (pre-Upper Miocene) age being formed during a period of Karstification in the Lower Tertiary. The apparent polarity sequence described earlier (Heller, 1977) is not of Jurassic age.
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References
Birzer, F. (1939) Verwitterung und Landschaftsentwicklung in der sudlichen Frankenalb. Z. Deut. Geol. Ges. 91:1-57
Dunlop, D.J. (1972) Magnetic mineralogy of unheated and heated red sediments by coercivity spectrum analysis. Geophys. J. Roy. Astron. Soc. 27:37-55
Forsyth, J.B., Hedley, I.G., Johnson, C.E. (1968) The magnetic structure and hyperfine field of goethite. J. Phys. C Ser. 2, 1:179-188
Freyberg, B.v. (1968) Der Faziesverband im Unteren Malm Frankens. Erlanger Geol. Abh. 62, 1966 Hedley, l.G.: Chemical remanent magnetization of the FeOOH, Fe20 3 system. Phys. Earth Planet. Inter. 1:103-121
Hedley, I.G. (1971) The weak ferromagnetism of goethite (()(-FeOOH). J. Geophys. 37:409-420
Heiniger, Chr., Heller, F. (1976) A high temperature vector magnetometer. Geophys. J. Roy. Astron. Soc. 44:281-287
Heller, F. (1977) Palaeomagnetism of Upper Jurassic limestones from Southern Germany. J. Geophys. 42:475-488
Kelly, W.C. (1956) Application of differential thermal analysis to identification of natural hydrous ferric oxides. Amer. Mineral. 41:353-355
Larson, R.L., Hilde, T.W.C. (1975) A revised time scale of magnetic reversals for the Early Cretaceous and Late Jurassic. J. Geophys. Res. 80:2586-2594
Lowrie, W., Alvarez, W. (1977) Late Cretaceous geomagnetic polarity sequence: Detailed rock and palaeomagnetic studies of the Scaglia Rossa limestones at Gubbio, Italy. Geophys. J. Roy. Astron. Soc. 51:561-582
Merrill, R.T. (1970) Low temperature treatments of magnetite and magnetite-bearing rocks. J. Geophys. Res. 75:3343-3349
Sampson, C. F. (1969) The lattice parameters of natural single crystal and synthetically produced goethite (ct-FeOOH). Acta Cryst. B25:1683-1685
Schellmann, W. (1959) Experimentelle Untersuchungen uber die sedimentare Bildung von Goethit und Hamatit, Chemie Ertle 20:104-135
Steiner, M.B., Helsley, C.E. (1972) Jurassic polar movement relative to North America. J. Geophys. Res. 77:4981-4993
Strangway, D. W., Honea, R. M., McMahon, B.E., Larson, E.E. (1968) The magnetic properties of naturally occurring goethite. Geophys. J. Roy. Astron. Soc. 15:345-359
Stumm, W., Morgan, J.J. (1970) Aquatic chemistry. New York: Interscience Publishers
Wilson, J.L. (1975) Carbonate facies in geologic history. Berlin-Heidelberg, Springer, New York