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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