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Magnetic mapping of geologic contacts in the Taourirt–Oujda corridor–Horst belt (northeastern Morocco)

العنوان: المسح المغناطيسي للتراكيب الخطية الجيولوجية لِممر تاوريرت ـ وجدة وجبال الهورست (شمال شرق المغرب)

Arabian Journal of Geosciences volume 4, pages 299–308 (2011)Cite this article

Abstract

From a geologist's perspective, magnetic data are most useful in mapping contacts and providing insight into the 3D geometry of the geology. Since the early 1970s, automatic methods based on the horizontal and vertical derivatives are applied to potential field data in order to map geological lineaments. In this paper, three methods for locating magnetic contacts are applied to magnetic anomaly data of the study area. The local maxima of horizontal gradient determined on the magnetic map and its upward continued maps to several heights delineate the contacts and indicate their dips. The amplitude of the 3D analytic signal of magnetic data provides information on the location of the edge of the sources in both the horizontal and vertical dimensions. The Euler deconvolution is also used to estimate the source depth at the contact location. These results allow the production of a structural map showing the magnetic lineaments for the survey area. This map is consistent with many faults already recognised or supposed by the traditional structural studies and highlights new ones by specifying their layout and dips.

ملخص

تعتبر المعطيات المغناطيسية وسيلة هامّة في الحصول على منظور ثلاثي الأبعاد للبنية الجيولوجية و مسح حدودها. فمنذ أوائل السبعينيات، يتِم تطبيق تقنيات أوتوماتيكية ترتكز على المشتقات الأفقية و العمودية للشّدة المغناطيسية من أجل إنتاج خرائط التراكيب الخطية الجيولوجية التحت السطحية. تتمحور هذه الدراسة حول إعادة تفسير المعطيات المغناطيسية باستعمال تقنيات حديثة للمعالجة ( التدريج الأفقي، التمديد إلى الأعلى ،الإشارة التحليلية وطريقة أولر ) من اجل تحديد مواقع التراكيب الخطية المغناطيسية لشمال ـ شرق المغرب. مكّنت المكسيما المحلِّية للتدريج الأفقي المحددة على الخريطة المغناطيسية المحوَلة إلى القطب و على الخرائط الممددة إلى الأعلى (إلى عِدة مستويات) مِن تحديد التراكيب الخطية وإتجاه مَيلانها. كما تمّت الإستعانة بخصائص الإشارة التحليلية في الأبعاد الثلاثة و بطريقة أولر لتحديد مكان وعمق الأجسام المغناطيسية. نتيجةً لهذه الدراسات تمّ التوصل إلى خريطة بنيوية تظهر مختلف التركيبات الخطية المغناطيسية.هذه النتائج أكدت من جهة الدراسات البنيوية السابقة للفوالق المؤكدة و المحتملة كما أبرزت من جهة أخرى تراكيب خطية جديدة مع تحديد مكانها،عمقها و مَيلانها.

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Acknowledgements

The authors would like to thank the anonymous reviewer for their detailed comments on the manuscript, which helped to improve this paper considerably.

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Authors and Affiliations

  1. Laboratoire des Géosciences Appliquées & Centre de l’Oriental des Sciences et Technologies de l’Eau (COSTE), Faculté des Sciences, Université Mohammed I, B.P. 717, 60000, Oujda, Morocco

    Radia El Gout, Driss Khattach, Mohammed-Rachid Houari & Touria Chennouf

  2. Laboratoire des Géosciences Appliquées, Faculté des Sciences, Université Mohammed I, B.P. 717, 60000, Oujda, Morocco

    Radia El Gout

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  1. Radia El Gout
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  2. Driss Khattach
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  3. Mohammed-Rachid Houari
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  4. Touria Chennouf
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Correspondence to Radia El Gout.

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El Gout, R., Khattach, D., Houari, MR. et al. Magnetic mapping of geologic contacts in the Taourirt–Oujda corridor–Horst belt (northeastern Morocco). Arab J Geosci 4, 299–308 (2011). https://doi.org/10.1007/s12517-010-0163-9

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  • DOI: https://doi.org/10.1007/s12517-010-0163-9

Keywords

  • Northeastern Morocco
  • Magnetic anomaly
  • Contacts
  • Horizontal gradient
  • Analytic signal
  • Euler deconvolution