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

دراسة المغنطيسية القديمة و بعض الخصائص المغنطيسية و الفيزيائية لبعض الصخور الاندفاعية بين صنعاء و منطقة الحديدة (الجمهورية اليمنية)

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 Publication date 2003
and research's language is العربية
 Created by Shamra Editor




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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.


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Research summary
تتناول هذه الدراسة الخصائص المغناطيسية والفيزيائية لبعض الصخور النارية من العصر الثالث في منطقة بين صنعاء والحديدة في اليمن. تم تحليل 136 عينة من 22 موقعًا مختلفًا على طول الطريق بين صنعاء والحديدة. تضمنت الدراسة قياس الخصائص المغناطيسية مثل القابلية المغناطيسية، شدة المغناطيسية المتبقية الطبيعية (NRM)، الموصلية الكهربائية للتيار المتردد، والكثافة. تم قبول سبعة أقطاب مغناطيسية افتراضية (VGP) من العصر الأوليغوسيني العلوي وتم حساب متوسطها. تم استخدام الخصائص المختلفة كعوامل مميزة لتمييز التدفقات النارية المجاورة. ساعد قياس القابلية المغناطيسية في الموقع في حساب القيم المتوسطة لكل منطقة فرعية، والتي يمكن استخدامها في أي تفسير مغناطيسي مستقبلي. كما تم قياس كثافة العينات لحساب القيم المتوسطة لكل منطقة فرعية لاستخدامها في تفسير أي شذوذ جاذبي مستقبلي في المنطقة.
Questions related to the research
  1. ما هي الخصائص المغناطيسية التي تم قياسها في الدراسة؟

    تم قياس القابلية المغناطيسية، شدة المغناطيسية المتبقية الطبيعية (NRM)، والموصلية الكهربائية للتيار المتردد.

  2. ما هو متوسط الأقطاب المغناطيسية الافتراضية (VGP) المقبولة؟

    متوسط الأقطاب المغناطيسية الافتراضية المقبولة هو 182.81º شرقًا و77.44º شمالًا.

  3. كيف تم استخدام القابلية المغناطيسية في الدراسة؟

    تم استخدام القابلية المغناطيسية كعامل مميز لتمييز التدفقات النارية المجاورة ولحساب القيم المتوسطة لكل منطقة فرعية لاستخدامها في التفسير المغناطيسي المستقبلي.

  4. ما هي النتائج الرئيسية للدراسة؟

    النتائج الرئيسية تشمل تحديد متوسط الأقطاب المغناطيسية الافتراضية، تأكيد أن المغنتيت هو المعدن المغناطيسي الرئيسي، وتحديد القيم المتوسطة للكثافة والقابلية المغناطيسية للصخور المختلفة.


References used
Abou-Deeb, J. M. (1997a). Studies of some magnetic and physical properties of some Quaternary - Recent basaltic rocks (Jabal Al-Arab, Syria). Damascus University Journal (Basic Sciences), Vol. 13, No. 1, pp. 131-151
Abou-Deeb, J. M. (1997b). Studies of some magnetic and physical properties of Middle Miocene basaltic rocks (Kisweh- South of Damascus). Damascus University Journal (Basic Sciences), Vol. 13, No. 2, pp. 55-77
Abou-Deeb, J. M. (1998). Studies of palaeomagnetism and some magnetic and physical properties of Upper Pliocene basaltic rocks (West of Homs - Syria). Damascus University Journal (Basic Sciences), Vol. 14, No. 2, pp. 97-117
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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.
Palaeomagnetism and some magnetic and physical properties such as magnetic susceptibility, intensity of remanent magnetisation, ac current electrical conductivity and density for the number order (٣٩ - ٥٤) of samples from ٩ sites of Upper Pliocene basaltic rocks from the area west of Homs were studied. The aim of the works to extend the previous studies (Abou- Deeb, ١٩٩٧a, b) to other regions so that these properties might be used as characteristic factors in discriminating the basaltic flows.
Some magnetic and physical properties ( magnetic susceptibility , intensity of remanent magnetisation , ac current electrical conductivity and density ) of ١٨١ samples from ٣٠ sites of Middle Miocene basaltic rocks (β 1 N2) from Al- Kisweh region south of Damascus were studied, in order to extend the previous study ( Abou-Deeb, ١٩٩٧) to other regions so that these properties might be used as characteristic factors in discriminating the neighbouring basaltic flows .The measurement of the in situ magnetic susceptibility of ٧٥ basaltic sites , distributed on ٨ localities , in the region helped to calculate the mean value of the magnetic susceptibility of each locality and an overall mean value of the whole region, which might be used in any magnetic interpretation of the magnetic anomalies. Also, the density of ١٢٨ samples were measured and a mean value of the density of each locality and an overall mean density were calculated in order to be used in any future interpretation of any gravity anomaly in the region .
foamed concrete is a concrete made by cement slurry mixed with foaming agent, so that foamed concrete is lighter than conventional concrete. The objectives of this study is to produce this kind of concrete, and to study some of its physical and mec hanical properties. Mix design of concrete was made for four required densities (1000, 1300,1600,1900 kg/m3), cement content of 350 kg/ m3, and water to cement ratio equal to 0.5. Different tests were performed to determine some properties of product concrete such as density, compressive strength and splitting tensile strength. The results demonstrated the possibility of production foamed concrete with wide range of density and strength. The oven dry density of foamed concrete was in the range of (870-1773 kg/m3) , compressive strength was in the range of (2.95-16.2 Mpa ), and the splitting strength was in the range of (0.32-1.76Mpa).

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