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Register a new userStudy 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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جمال أبو ديب( باحث )
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قيست المغنطيسية القديمة، و بعض الخصائص المغنطيسية و الفيزيائية: المتأثرية المغنطيسية، و الشدة المغنطيسية الأولية، و الناقلية الكهربائية (بالتيار المتناوب) و الكثافة لـ 136 عينة صخرية مأخوذة مـن 22 موقعاً من مجموعة صخور اليمن الاندفاعية (عائدة للعصر الثلاثي و إلى الكريتاسي)، مـن تكـشفات على جانبي طريق صنعاء-الحديدة. لقد أمكن عزل مجموعة من سبعة أقطاب مغنطيسية (من الأوليغوسين الأعلى) أعطت قيماً وسطية مقدارها °81.182 شرقاً، °44.77 شمالاً °5.12= α95 كمـا تـم قيـاس الخصائص الفيزيائية المختلفة لاستخدامها كعوامل مميزة بين صخور الصبات البركانية المتجاورة. و كذلك قيست حقلياً المتأثرية المغنطيسية لصخور المنطقة موضوع الدراسة في 140 موقعاً، موزعـة علـى 7 مناطق جزئية، مما سمح بالحصول على قيمة وسطية للمتأثرية المغنطيسية لكل منها تسهم فـي تفـسير الشواذ المغنطيسية المصادفة في الخريطة المغنطيسية، أو تلك الناتجة عن أي مسح مغنطيسي جـوي أو أرضي في المنطقة. كما تم قياس الكثافة لـ 136 عينة من المنطقة موضـوع الدراسـة، ممـا سـمح بالحصول على قيم متوسطة للكثافة لكل تحت-منطقة، يمكن استخدامها في تفسير الـشذوذات الجاذبيـة المصادفة في خريطة الجاذبية، أو تلك الناتجة عن أي مسح جاذبي في المنطقة.
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.
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 .
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.
Syria
سورية
Density
حُمّص
الكثافة
المتأثرية المغنطيسية
المغنطيسية المتبقية الأولية
Magnetic susceptibility
Magnetostratigraphy
Homs
ac current electrical conductivity
الناقلية الكهربائية بالتيار المتناوب
الستراتغرافيا المغنطيسية
زمن القطبية
كسوة
سويداء
NRM= Natural Remanent Magnetisation
polarity chron
Kisweh
Swedah
المزيد..
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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