Paleomagnetic Analysis

[29]  The processing of the samples was carried out at the Paleomagnetic Laboratory of the Paris Earth Physics Institute, at the Paleomagnetic Laboratory of the St. Petersburg Geological Institute, and at the Main Magnetic Field Laboratory of the Institute of Physics of the Earth, Russian Academy of Sciences. Measurements were made using a 2G Enterprise vertical SQUID magnetometer and JR-4 and JR-5 spin magnetometers. All samples were subjected to stepwise temperature demagnetization at temperatures of up to 560-680o C with the number of cleaning steps ranging from 10-15 to 18-20. The rock samples were demagnetized using special nonmagnetic stoves of the Schonstedt Instrument Company with a noncompensated field value of not more than 5-10 nT (TSD-1), and also the stoves manufactured at the laboratories of the Institute of Physics of the Earth and IPGP. Most of the measurements were made in the space screened off from the outer geomagnetic field. The measurement results were processed using the Enkin computer program package Enkin [1994], which identifies magnetization components by the PCA method [Kirschvink, 1980]. The SELECT program package, developed by Shipunov [1995], was used to calculate the intersection points of small circles and to perform the fold test (NFT).


RJES

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