Palaeomagnetism and some magnetic and physical properties (magnetic
susceptibility, intensity of the Natural Remnant Magnetization (NRM), ac
current electrical conductivity and density) of 136 samples from 22 sites of the
Yemen Volcanic Group TKY
(Tertiary and (or) Cretaceous) from igneous rock
exposures along the road from Sana’a – west towards Al-Hudyadah were
studied. A single population consists of seven Virtual Geomagnetic Poles
(VGP), of the Upper Oligocene, was accepted and a mean at 182.81° E, 77.44° N
with α95= 12.5° was calculated. The different properties were measured in
order to use these properties as characteristic factors to discriminate the
neighboring igneous flows. The measurement of the in situ magnetic
susceptibility of 140 points, distributed on 7 sub-areas, in the region helped to
calculate the mean value of the magnetic susceptibility of each sub-area, which
might be used in any magnetic interpretation of aeromagnetic or magnetic
anomalies. Also, the density of 132 samples were measured and a mean value of
the density of each sub-area was calculated in order to be used in any future
interpretation of any gravity anomaly in the area.
Density
Basalt
الكثافة
المتأثرية المغنطيسية
المغنطيسية المتبقية الأولية
مجموعة صخور اليمن الاندفاعية
Magnetic susceptibility
Palaeomagnetism
بازلت
الناقلية الكهربائية (بالتيار المتناوب)
اغنمبريت
طف ملتحم
بورفيريت أساسي
أغلوميريت
NRM = Natural Remnant Magnetization
ac current electrical conductivity
(Virtual Geomagnetic Poles (VGPs
ignembrite
welded tuffs
basic porphyrites
المزيد..