ISSN:
1573-9708
Keywords:
magnetostratigraphy
;
magnetic mineralogy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract Twenty-six basaltic flows were sampled for a paleomagnetic and rock-magnetic study of the Tchuntchka section in the Akhalkalaki volcanic region in southern Georgia (Caucasus). Three to five samples from each flow were subjected to thermal or alternating-field demagnetization. The upper part of the section yields normal (D = 355.5°, I = 54.2°, N = 17, α95 = 2.5°, k = 226), and the lower part reversed polarity directions (D = 180.3°, I = − 59.4,° N = 8, α95 = 4.8°, k = 135). An anomalous direction was found in one flow in the upper part (D = 118.5°, I = − 77.3°). Rock-magnetic experiments show that the remanence is carried in most cases by magnetite or low-Ti titanomagnetite. The fraction of grains with a multidomain magnetic structure does not seem to be important. The remanence carried by such grains is removed only partly by low-temperature demagnetization. A tentative magnetostratigraphic correlation between the 3.8-Ma-old Thoki and Tchuntchka sites is proposed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1003109918707
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