A palaeomagnetic study of Syrian volcanic rocks of Miocene to Holocene age

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Published: Jan 1, 1999
DOI: https://doi.org/10.22201/igeof.00167169p.1999.38.1.896
Keywords:
Paleomagnetism, volcanism, magnetostratigraphy, Neogene, Syria

Main Article Content

J. M. Abou-Deeb
Department of Geology, The University of Damascus, Syria
M. M. Otaki
Department of Geology, The University of Damascus, Syria
D. H. Tarling
Department of Geological Sciences, The University of Plymouth, U.K
A. L. Abdeldayem
Department of Geological Sciences, The University of Plymouth, U.K. ; Now at Department of Geology, University of Tanta, Egypt.

Abstract

Miocene and younger volcanic rocks from Syria show both normal and reversed polarities after thermal demagnetisation. Similarities in site mean directions may be used to establish lavas erupted at similar times. The observed polarities suggest that some Quaternary volcanics are older than previously mapped. The site mean directions of reversed and intermediate polarity sites are more scattered than for normal polarity sites, and the overall scatter is larger than would be expected from models of secular variation simulated by westward or eastward drift of the present non axial dipole field. The normal sites are also twice as strongly magnetised as the reversed and intermediate polarity sites. The mean direction of the Quaternary sites is consistent with an axial geocentric dipole model, but the Miocene sites, while having antipodal directions for the two polarities, have a mean inclination that is shallower than the axial dipole field and may indicate persistent geomagnetic effects or possibly regional tilting.

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How to Cite
Abou-Deeb, J. M., Otaki, M. M., Tarling, D. H., & Abdeldayem, A. L. (1999). A palaeomagnetic study of Syrian volcanic rocks of Miocene to Holocene age. Geofisica Internacional, 38(1), 17–26. https://doi.org/10.22201/igeof.00167169p.1999.38.1.896
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Vol. 38 No. 1 (1999): January 1, 1999
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Article
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

References

BAKSI, A. K., V. HSU, M. O. McWILLIAMS and E. FARRAR, 1992. 40Ar/39Ar dating of the Brunhes-Matuyama geomagnetic field reversal. Science, 256, 356-357. DOI: https://doi.org/10.1126/science.256.5055.356

BEST, J., M. BARAZANGI, D. AL-SAAD, T. SAWAF and A. GEBRAN, 1993. Continental margin evolution of the northern Arabian platform of Syria. Amer. Assoc. Petrol. Geol., Bull., 77, 173-193. DOI: https://doi.org/10.1306/BDFF8BBE-1718-11D7-8645000102C1865D

CANDE, S. C. and D. V. KENT, 1992. A New Geomagnetic Polarity Time Scale for the Late Cretaceous and Cenozoic. J. Geophys. Res., 97, 13917-13951. DOI: https://doi.org/10.1029/92JB01202

COLLISON, D. W., 1983. Methods and Techniques in Rock Magnetism and Palaeomagnetism. Chapman and Hall, London, pp. 503. DOI: https://doi.org/10.1007/978-94-015-3979-1

CREER, K. M., 1962. The dispersion of the geomagnetic field due to secular variation and its determination for remote times using palaeomagnetic data. J. Geophys. Res., 67, 3461-3476. DOI: https://doi.org/10.1029/JZ067i009p03461

DUBERTRET, L., 1933. Le Miocene en Syrie et au Liban, Notes et Mémoires Syrie et Liban 1, 13-28.

EINDERS, J. and U. HAMBACH, 1995. A geomagnetic event recorded in loess deposits of the Tonchesberg (Germany): identification of the Blake polarity episode. Geophys. J. Int., 122, 407-418. DOI: https://doi.org/10.1111/j.1365-246X.1995.tb07004.x

FISHER, R. A., 1953. Dispersion on a sphere. Proc. Roy. Soc., A217, 295-305. DOI: https://doi.org/10.1098/rspa.1953.0064

KIRSCHVINK, J. L., 1980. The least-squares line and plane and the analysis of palaeomagnetic data. Geophys. J. R. astr. Soc., 62, 699-718. DOI: https://doi.org/10.1111/j.1365-246X.1980.tb02601.x

MOLYNEUX, L. M., 1971. A complete results magnetometer for measuring the remanent magnetisation of rocks. Geophys. J. R. astr. Soc., 24, 429-433. DOI: https://doi.org/10.1111/j.1365-246X.1971.tb02188.x

MOUTY, M., M. DELALOYE, D. FONTIGNIE, O. PISKIN and J. WAGNER, 1992. The volcanic activity in Syria and Lebanon between Jurassic and the Actual. Schweiz. Mineral. Petrogr. Mitt., 72, 91-105.

PONIKAROV, V. P., 1966. Editor. Explanatory notes on the Geological Map of Syria: Scale 1:1,000,000 Ministry of Industry, Damascus, Syria.

ROPERCH, P. and N. BONHOMMET, 1986. Paleomagnetism of Miocene volcanism from South Syria. J. Geophys., 59, 98-102.

TARLING, D. H. and D. T. A., SYMONS, 1967. A stability index of remanence in palaeomagnetism. Geophys. J. R. astr. Soc., 12, 443-448. DOI: https://doi.org/10.1111/j.1365-246X.1967.tb03153.x

TARLING, D. H., 1983. Palaeomagnetism. Chapman and Hall, London pp. 379. DOI: https://doi.org/10.1007/978-94-009-5955-2

TARLING, D. H. and M. J. DOBSON, 1995. Archaeomagnetism: An Error Assessment of Fired Material Observations in the British Directional Database. J. Geomagn. Geoelectr., 47, 5-18. VAN DONGEN, P. G., R. DOI: https://doi.org/10.5636/jgg.47.5

VAN DER VOO and TH. RAVEN,1967. Palaeomagnetic research in Central Lebanon Mountains and in the Tartous area (Syria). Tectonophysics, 4, 35-53. DOI: https://doi.org/10.1016/0040-1951(67)90057-1