Analysis of magnetic inclination in borecores
- 40 Downloads
In palaeomagnetism it is usually assumed that the distribution of directions of natural remanent magnetization at a site is Fisherian. This assumption is used here for an analysis of dispersion on a sphere when only inclination (and not declination) of NRM directions is known. By this method, in spite of the lack of declination data, the mean inclination and precision of the parent Fisherian population are estimated, together with the probable errors in these estimates. The method is tested against known Fisherian populations and is then used for dealing with data from borecores, where the way-up of cores and dip of the hole are known, but the azimuth of cores is not. Uses of the information derived from this analysis include estimations of age of NRM, support for palaeomagnetic data from surface studies, and comparison of dispersion of the palaeomagnetic field with that of the present geomagnetic field.
KeywordsAzimuth Probable Error Remanent Magnetization Fisherian Population Magnetic Inclination
Unable to display preview. Download preview PDF.
- A. N. Khramov, On palaeomagnetism as the basis of a new method of correlation and stratification of sedimentary layers, Doklady Akad. Nauk SSSR nov. ser., 112, No.5 (1957).Google Scholar
- J. C. Jaegar andG. A. Joplin,Rock magnetism and the differentiation of a dolerite sill, Geol. Soc. Austr. J.2 (1955), 1.Google Scholar
- E. Irving,Paleomagnetism of the Naryabeen Chocolate Shales and Tasmanian Dolerite, J. Geophys. Res.68 (1963), 2283.Google Scholar
- A. Cox andR. R. Doell,Magnetic properties of the basalt in hole EM7, Mohole project, J. Geophys. Res.67 (1962), 3997.Google Scholar
- R. A. Fisher,Dispersion on a sphere, Proc. Roy. Soc. Lond.217-A (1953), 295.Google Scholar
- E. Irving andD. H. Tarling,Paleomagnetism of the Aden Volcanics, J. Geophys. Res.66 (1961), 549.Google Scholar
- W. A. Robertson andL. Hastie,A palaeomagnetic study of the Cygnet Alkaline Complex of Tasmania, Geol. Soc. Austr. J.8 (1962), 259.Google Scholar
- K. M. Creer, E. Irving andA. E. M. Nairn,Palaeomagnetism of the Great Whin Sill, Geophys. J.2 (1959), 306.Google Scholar
- C. Bull, E. Irving andI. Willis,Further Palaeomagnetic results from South Victoria Land, Antarctica, Geophys. J.6 (1962), 320.Google Scholar
- E. Irving,Paleomagnetism and its application to geological and geophysical problems (Wiley, New York 1964).Google Scholar
- J. C. Briden,Ancient secondary magnetizations in rocks, J. Geophys. Res.70 (1965), 5205.Google Scholar