Artículos de revistas
A palaeomagnetic study of Syrian volcanic rocks of Miocene to Holocene age
A palaeomagnetic study of Syrian volcanic rocks of Miocene to Holocene age
Author
Abou Deeb, J. M.; Department of Geology, The University of Damascus, Syria.
Otaki, M. M.; Department of Geology, The University of Damascus, Syria.
Tarling, D. H.; Department of Geological Sciences, The University of Plymouth, U.K.
Abdeldayem, A. L.; Department of Geological Sciences, The University of Plymouth, U.K.
Now at Department of Geology, University of Tanta, Egypt.
Institutions
Abstract
Rocas volcánicas del Mioceno y más jóvenes de varias localidades de Siria muestran polaridades normales y reversas después de desmagnetización térmica. Las similitudes en las direcciones medias de magnetización pueden ser usadas para establecer correlación entre lavas. Las polaridades observadas sugieren que algunas de las lavas del Cuaternario son más antiguas de lo propuesto en cartografías previas. Los sitios con direcciones medias reversas e intermedias presentan una dispersión angular mayor que la observada en los sitios de direcciones normales. La dispersión media global es mayor que la esperada de acuerdo con los modelos de variación secular simulados con deriva al oeste o este y el campo dipolar inclinado actual. Los sitios de polaridad normales tienen magnetizaciones dos veces mayores que los sitios de polaridad reversa e intermedia. La dirección media para los sitios del Cuaternario es consistente con el campo dipolar axial, pero para los sitios del Mioceno, con direcciones antipodales de polaridades opuestas, tienen una inclinación media más somera que la dipolar, lo que sugiere un efecto geomagnético o inclinación regional tectónica. 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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