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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-21 20:27 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Preliminary rock magnetic properties of Quaternary basalts from the Persani Mts. (Romania)
Authors:
A. Tugui, C. Necula, C. Panaiotu
Affiliation:
University of Bucharest, Faculty of Physics
E-mail
panaiotu@geo.edu.ro
Keywords:
rockmagnetism paleomagnetism Quaternary volcanism
Abstract:
The alkali basaltic volcanism in the Persani Mountains (46°N, 25.2°E), although of modest extensions (ca. 22x8 km), represents an important Quaternary alkali basaltic provided inside the Carphatians and south-eastern Europe. K-Ar ages have show that there are two phases of volcanism. The first one took place between 1.5 ma and 1.2 Ma. The second one was 600 ka later, around 0.6 Ma. Previous paleomagnetic results (Panaiotu et al., 2004) have shown that the first phase of the eruptions has recorded the Cobb Mountain subcron. The second phase is developed inside Bhrunes chron, but one of the lavas has recorded a short reversals. Due to these findings a new research project was started in 2007 to obtain more details about the directional and paleointensity changes recorded by the Quaternary volcanism from the Persani Mountains. We will present the first rockmagnetic (field and temperature dependence of the magnetic susceptibility, hysteresis properties) results of this new study. These preliminary results show that the magnetic mineralogy is dominate by a mixture of magnetite and titanomagnetite. The content in titan is relative low in the lavas erupted at the beginning of the first phase of eruptions. The lavas from the main phase of eruptions contain high Ti-magnetite with Curie temperature as low as 200°C and a strong filed variation of the magnetic susceptibility.
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