Grain size effect on the low-temperature oxidation of titanomagnetite
Article Sidebar
Vols. 1-18 (1924-1944), ISSN 0044-2801
Main Article Content
Abstract
The low-temperature oxidation process in titanomagnetite has been investigated. Using samples with controlled grain sizes, it has been shown that there is a critical grain size in the oxidation behaviour of titanomagnetites; smaller grains undergo low-temperature oxidation, while larger ones separate to Fe-rich titanomagnetite and Ti-rich hemo-ilmenite (high-temperature oxidation). The difference between the results of similar experiments by Ozima and Sakamoto (1971) and by Readman and O'Reilly (1972) can be explained in terms of differences in partide sizes of titanomagnetites. Comparable results were obtained from natural subaerial and submarine basalts; when they are heated to temperatures between 150° C and 375° C, oxidation proceeds in submarine basalts, but it does not in subaerially erupted basalts and a high-temperature oxidation process occurs. This fact indicates that the grain size of the magnetic minerals is one of the most important controlling factors in low-temperature oxidation of titanomagnetites.
ARK: https://n2t.net/ark:/88439/y041502
Permalink: https://geophysicsjournal.com/article/266
Article Details
References
Akimoto, S., Katsura, T. (1959) Magneto-chemical study of the generalized titanomagnetite in volcanic rocks. J. Geomagn. Geoelectr. 10:69-90
Buddington, A.F., Lindsley, D.H. (1964) Iron-titanium oxide minerals and synthetic equivalents. J. Petrology 5:310-357
Day, R., Fuller, M.D., Schmidt, V.A. (1976) Magnetic hysteresis properties of synthetic titanomagnetite. J. Geophys. Res. 81:873-880
Day, R., Fuller, M., Schmidt, V.A. (1977) Hysteresis properties of titanomagnetites: Grain-size and compositional dependence. Phys. Earth Planet. Inter. 13:260-267
Donnelly, T.W. et al. (1980) Introduction and explanatory notes. Initial Reports of the Deep Sea Drilling Project, Vol. 51, 52 and 53, pp. 5-22: U.S. Government Printing Office, Washington, D.C.
Hamano, Y., Nishitani, T., Kono, M. (1980) Magnetic properties of basalt samples from Deep Sea Drilling Project holes 417D and 418A. Initial Reports of the Deep Sea Drilling Project, Vol. 51, 52, and 53, pp. 1391-1405: U.S. Government Printing Office, Washington, D.C.
Irving, E. (1970) The Mid-Atlantic ridge at 45° N, XIV. Oxidation and magnetic properties of basalt; review and discussion. Can. J. Earth Sci. 7:1528-1538
Jackson, E.D., Koizumi, I., Dalrymple, G.B., Clague, D.A., Kirkpatrick, R.J., Greene, H.G. (1980) Introduction and summary of results from DSDP Leg 55, the Hawaiian-Emperor Hot-spot experiment. Initial Reports of the Deep Sea Drilling Project Vol. 55 pp. 5-31. U.S. Government Printing Office, Washington, D.C.
Keefer, C.M., Shive, P.N. (1981) Curie temperature and lattice constant reference contours for synthetic titanomaghemites. J. Geo phys. Res. 86:987-998
Kono, M. (1980) Magnetic properties of DSDP Leg 55 basalts. Initial Reports of the Deep Sea Drilling Project Vol. 55 pp. 723-736: U.S. Government Printing Office, Washington, D.C.
Levi, S., Merrill, R.T. (1976) A comparison of ARM and TRM in magnetite. Earth Planet. Sci. Lett. 32:171-184
Lowrie, W. (1974) Oceanic basalt magnetic properties and the Vine and Matthews Hypothesis. J. Geophys. 40:513-536
Nagata, T. (1961) Rock Magnetism. Maruzen, Tokyo
Nishitani, T. (1979) Low-temperature oxidation of titanomagnetites and its effect on the remanent magnetization in basaltic rocks. Ph.D. Thesis, University of Tokyo
Nishitani, T. (1981) Magnetic properties of titanomagnetites containing spinel (Mg Al2 O4). J. Geomagn. Geoelectr. 33:171-179
O'Donovan, J.B., O'Reilly, W. (1977a) Range of non-stoichiometry and characteristic properties of the products of laboratory maghemitization. Earth Planet. Sci. Lett. 34:291-299
O'Donovan, J.B., O'Reilly, W. (1977b) The preparation, characterization and magnetic properties of synthetic analogues of some carriers of the palaeomagnetic record. J. Geomagn. Geoelectr. 29:331-344
Ozima, M., Larson, E.E. (1970) Low- and high-temperature oxidation of titanomagnetite in relation to irreversible changes in the magnetic properties of submarine basalts. J. Geophys. Res. 75:1003-1017
Ozima, M., Sakamoto, N. (1971) Magnetic properties of synthesized titanomaghemite. J. Geophys. Res. 76:7035-7046
Readman, P.W., O'Reilly, W. (1970) The synthesis and inversion of nonstoichiometric titanomagnetites. Phys. Earth Planet. Inter. 4:121-128
Readman, P.W., O'Reilly, W. (1972) Magnetic properties of oxidized (cation deficient) titanomagnetite (Fe, Ti, ▢)3O4 . J. Geomagn. Geoelectr. 24:69-90
Sakamoto, N., Ince, P.I., O'Reilly, W. (1968) The effect of wet-grinding on the oxidation of titanomagnetites. Geophys. J. 15:509-515
Storetvedt, K.M., Carmichael, C.M., Hayatsu, A., Palmer, H.C. (1978) Palaeomagnetism and K/Ar results from the Duncansby volcanic neck, NE Scotland: superimposed magnetizations, age of igneous activity, and tectonic implications. Phys. Earth Planet. Inter. 16:379-392