Study of Palaeomagnetism and Magnetic and Some Physical Properties of Tertiary Igneous Rocks of Sana’a Region (Republic of Yemen)

Palaeomagnetism and some magnetic and physical properties (magnetic susceptibility, intensity of remanent magnetization, ac current electrical conductivity and density) of 115 samples from 18 sites of the Yemen Volcanic Group TKY (Tertiary and (or) Cretaceous) from igneous rock exposures from Sana’a region were studied. One palaeomagnetic pole position was determined and a magneto-strigraphy of the area was suggested. The different properties were measured in order to use them as characteristic factors in discriminating the neighboring igneous flows. The measurement of the in situ magnetic susceptibility of 80 points, distributed on 4 sub-areas, in the area helped to calculate the mean value of the magnetic susceptibility of each sub-area, which may be used in any magnetic interpretation of aeromagnetic or magnetic anomalies. Also, the density of 115 samples were measured and a mean value of the density of each sub-area and an overall mean density of each rock age, were calculated in order to be used in any future interpretation of any gravity anomaly in the area.

Dating and Correlating Some Syrian Basaltic Rocks by Using Some of Their Magnetic Properties

Palaeomagnetism and some magnetic and physical properties (magnetic susceptibility, intensity of remanent magnetisation, ac current electrical conductivity and density) of many basaltic samples were studied.