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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:09 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Anisotropy of magnetic susceptibility of Quaternary lava flows from the East Carpathians
Authors:
C. Panaiotu (1), C. Necula (1), A. Tugui (1), T. Merezeanu (2), C. Corban (2), A. Panaiotu (2)
Affiliation:
(1) University of Bucharest, Faculty of Physics, P.O. Box MG-11, RO-077125 Bucharest-Magurele, Romania
(2) University of Bucharest, Faculty of Geology and Geophysics, Balcescu 1, Bucharest, Romania
E-mail
cristian.panaiotu@g.unibuc.ro
Keywords:
rockmagnetism, anisotropy of magnetic susceptibility, Quaternary lava flows, East Carpathians
Abstract:
In the last years, it was an undoubtedly important advance in our understanding of the nature of the anisotropy of magnetic susceptibility (AMS) in lava flows, but still new data are necessary to do some adjustment to current models. The presence of relative well preserved Quaternary volcanic structures in the East Carpathians is an opportunity to test if AMS can be used to identify the flow directions. Our sampling sites are located in the Persani Moutains and the South Harghita Mountains. Detalied rockmagnetic measurements (field and temperature variation of magnetic susceptibility, hysteresis properties and FORC diagrams) were performed to constrain magnetic mineralogy, magnetic granulometry and grains interactions. The results show that the main magnetic minerals are titanomagnetites with various contents of titan mainly in single domain or pseudosingle domain range. The AMS was determined using a spinner kappabdrige MFK1-A. We found out that in most of cases the direction of the maximum susceptibility measured in the central parts of the lava flows is in agreement with the expected direction toward the eruption center.
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