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The effect of uniaxial compression in the behaviour of remanent and induced magnetizations for basaltic rocks from the western Sinai Peninsula, Egypt

تأثير الجهد أحادى المحور غلى سلوك المغناطيسية المتبقية و الحثيةلصخور البازلت من غرب شبة جزيرة سيناء – مصر.

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Abstract

Seventy oriented basaltic samples were collected from six sites from the Wadi Budra and Farsh El Azraq areas of the west-central part of Sinai. Rock magnetic properties such as Curie temperatures and hysteresis parameters, as well as microscopic observations, point to magnetite as the main carrier of the remanent magnetization. The stress sensitivity of basaltic rocks is relatively low. High stress produces an increase in the remanent and induced magnetizations perpendicular to the applied stress axis and a decrease parallel to it. The change of magnetization during stress action ranges from 1.1% to 3.5% for a stress of 100 bar. The differential total magnetic intensity field with time (within 2 years) was observed through 80 magnetic observation points set up on both sites of the basaltic sheet at the studied area. The observed temporal variations of magnetization can be interpreted as stress loading parallel to the regional stress field in the order of 50 ± 20 bar, according to the stress sensitivity of the precursor basalt.

أحمد صالح

المعهد القومى للبحوث الفلكية و الجيوفيزيقية – حلوان – مصر. تم جمع سبعون عينة بازلت من ستة مواقع من وادى بودرا و فرش الأزرق فى الجزء الغربى من وسط سيناء . أثبتت دراسات الخواص المغناطيسية للصخورمثل درجة حرارة الكورى و منحنيات التخلف المغناطيسى بالأضافة الى الشواهد الميكروسكوبية ان معدن الماجنيتيت هو المعدن الرئيسى الحامل للمغناطيسية المتبقية . حساسية صخور البازلت للجهد المؤثر تكون منخفضة نسبيا . زيادة الجهد ينتج عنة زيادة فى قيمة المغناطيسية المتبقية و الحثية العمودية على محور الجهد المؤثر و نقصان فى قيمتها عندما تكون موازية لمحور الجهد المؤثر. تغير المغناطيسية أثناء زيادة الجهد يتراوح بين 1.1 الى 3.5 عندما يكون قيمة الجهد 100 بار . أختلاف شدة المجال المغناطيسى مع الوفت (خلال عامين) تم رصدة من خلال 80 محطة مغناطيسية تم وضعها على جانبى مكشف البازلت فى منطقة الدراسة. التغير الدورى الملاحظ للمغناطيسية قد فسر على انة ناتج عن جهد موازى لمجال الجهد الأقليمى و قيمتة 50 ± 20 بار بالنسبة الى حساسية جهد البازلت.

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Acknowledgements

The author wishes to thank Axel Schult (Department of Earth and Environmental Sciences, Munich University, Munich, Germany) for his help and support. Laboratory measurements were carried out at the Department of Earth and Environmental Sciences, LMU University, Munich, Germany. The author is grateful to Daniel Miggins for helpful review.

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  1. National Research Institute of Astronomy and Geophysics, Helwan, Cairo, Egypt

    Ahmed Saleh

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Correspondence to Ahmed Saleh.

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Saleh, A. The effect of uniaxial compression in the behaviour of remanent and induced magnetizations for basaltic rocks from the western Sinai Peninsula, Egypt. Arab J Geosci 5, 1175–1184 (2012). https://doi.org/10.1007/s12517-010-0260-9

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  • DOI: https://doi.org/10.1007/s12517-010-0260-9

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