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  • 1
    Electronic Resource
    Electronic Resource
    On the magnetic and mineralogical properties of basalts (1967)
    Springer
    Pure and applied geophysics 66 (1967), S. 69-76 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Systematic and extensive investigations on the magnetic and mineralogical properties of samples from basaltic lavas and doleritic dykes have been made. The results obtained lead to several interesting conclusions. Rocks giving Curie temperatures of around 250°C exhibit a high degree of magnetic stability, yield largeQn values (〉40) and often contain ore minerals possessing skeletal crystal structure. Also, such rocks can be saturated in low fields of the order of 1000 Oe, and give a value of around 0.5 for the ratioR of saturation remanence to the saturation intensity of magnetization. In contrast to this, rocks giving Curie temperatures of about 580°C are comparatively less stable, give smaller values ofQn, require higher fields for saturation and yield values ofR less than 0.2. Rocks with Curie temperatures ranging from 250°C to 550°C show general magnetic properties intermediate to those of the above two categories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875312
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  • 2
    Electronic Resource
    Electronic Resource
    On the magnetic memory phenomenon in rocks and its bearing on palaeomagnetic measurements (1968)
    Springer
    Pure and applied geophysics 70 (1968), S. 94-104 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The results of recent extensive studies on the low field hysteresis in basalts from India and East Africa and the memory phenomenon observed in some of the rocks have been found to have a direct bearing on the various parameters such asQ n,Q tn, stability by the A.C. field technique etc. which are of great importance in rock-magnetism. It has been found that rocks having low Curie temperature (itθ c ) and not exhibiting memory phenomenon are ideally suited for palaeomagnetic studies. Also, rocks having relatively higher itθ c often exhibit memory phenomenon, given inconsistent NRM directions and show an irregular behaviour on A.C. field cleaning. In using the latter rock types for palaeomagnetic work one has to take a number of precautions which are clearly brought out by the studies described in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875145
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Remanent Magnetism of the Rajmahal Traps of North-Eastern India (1958)
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 830-831 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During January 1957 we collected samples of the rocks from five localities spaced about 20 miles apart. Approximately ten samples were taken from each site, usually over a distance of several hundred yards. In two of the localities the material was found in the beds of streams, while in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/181830a0
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  • 4
    Electronic Resource
    Electronic Resource
    A portable susceptibility survey meter (1971)
    Springer
    Pure and applied geophysics 87 (1971), S. 161-164 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The earlier multi-coil techniques have been suitably modified to provide a portable apparatus for determining the average susceptibility of surface rocks in situ. The apparatus promises to fulfill, at least partly, the often felt need for fast technique for carrying out susceptibility surveys as an aid in palaeomagnetic studies and geomagnetic exploration work. In addition the instrument can also be successfully used as a metal detector in meteoritic investigations or in prospecting for conducting minerals. The serious limitation of the apparatus in its present form though there is some scope for improvement in this direction, is the rather low (20 to 30 cm) depth of penetration in the surface rocks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878920
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  • 5
    Electronic Resource
    Electronic Resource
    Problems concerning the magnetic behaviour and determination of curie points of certain basalts (1972)
    Springer
    Pure and applied geophysics 93 (1972), S. 129-140 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Magnetic hysteresis studies at different fields and temperatures have been carried out on several basalts. From such studies it would be often possible to delineate the single or multidomain character of the sample and in some cases to identify the magnetic minerals in them. However, in determining the Curie temperatures of the basalts, especially of those containing predominantly single domain grains, several difficulties arise, which are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875229
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