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.
44 sites were sampled from the Upper Pliocene (βNb
2) basaltic flows, from the
western flank and the distant eastern flank of the Levant Fault in the Buqeia area
NW of Tel Kalakh and west of Homs. Thermal demagnetization led to the
identification
of consistent directions of remanence in most sites. Normal, Reversed
and Intermediate polarities are identified, with Reversed polarities dominating.
The Intermediate polarity sites were excluded and the mean directions of the
Reversed sites were reversed.
