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Title of Journal: Arab J Geosci

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Abbravation: Arabian Journal of Geosciences

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Springer-Verlag

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DOI

10.1007/s00421-014-3076-6

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1866-7538

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Characteristic features of salt tectonics offshore

Authors: El Sayed Ibrahim Selim Mohamed A Omran
Publish Date: 2010/09/14
Volume: 5, Issue: 3, Pages: 371-383
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Abstract

Salt tectonic along offshore North Sinai was studied using seismic reflection data The study revealed and identified various types of salt tectonics and structures in the study area The triggering mechanism of salt tectonics was attributed to the pressure regime initiated from overloading sediments on the Messinian evaporites The sediment load of 3000 m exceeds the critical load more than 1000 m and hence creates a pressure zone The saltgenerated structures resulted from thinskinned extension that is driven by gravity gliding of the overloading sediments above the Messinian evaporite boundary which acts as a detachment layer These structures comprise normal growth faults and keystone grabens trending roughly perpendicular to the slope of the continental margin Salt tectonics in the study area were also triggered by the deformation of the movement of evaporite layer that causes stretching and fragmentation of the evaporite layer Moving salt layer took place laterally and vertically causing lateral and vertical pressures inside the Pliocene sediments These movements of sediments led to the formation of salt rollers salt weld salt diapirs rollover structures and fault blocks The interpretation of seismic data illustrates that the evaporite layer was switched off between the famous reflector M at its top and another reflector N at its base M reflector is present and can be traced across the whole study area while the N reflector pinched out in some parts of the study areaتم دراسة تراكيب الملح التكتونية في المنطقة البحرية شمال سيناء باستخدام البيات السيزمية المنعكسة وقد أدت الدراسة إلى التعرف على عدة أنواع من التراكيب الملحية التكتونية التي تشمل فوالق النمو وتراكيب الانهيار والأخاديد وتوجد هذه التراكيب عمودية على الطبقات الرسوبيات فى منطقة الرف القاري شمال سيناءوقد أثبتت الدراسة أن القوة المسببة لهذه التراكيب هو سمك رسوبيات عصر الباليوسين التي تتعدى 3000 متر والتي أدت إلى وجود زيادة في ضغط الرسوبيات على طبقات متبخرات عصر المسينين الموجودة بين اثنين من المنعكسات M N وقد سبب هذا الضغط سيولة وحركة رأسية وجانبية للمتبخرات مسببة تكوين التراكيب الملحية المذكورة العاكس إم يمثل السطح العلوى ويظهر فى جميع أجزاء منطقة الدراسة والعاكس إن يمثل الحد السفلى لطبقة الملح ويختفى فى أجزاء كثيرة تحت منطقة الدراسة ويظهر فى بعض الأحيان منطبقا على العاكس إم ليكون طبقة اللحام المميزة للملح فى منطقة الدراسة


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