Application of 3D Euler deconvolution and improved tilt angle to the aeromagnetic data of In Ouzzal terrane, western Hog
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ORIGINAL PAPER
Application of 3D Euler deconvolution and improved tilt angle to the aeromagnetic data of In Ouzzal terrane, western Hoggar, Algeria Lakhdar Harrouchi 1,2 & Mohamed Hamoudi 1 & Abderrahmane Bendaoud 3 & Lilia Beguiret 2
Received: 30 June 2015 / Accepted: 31 May 2016 # Saudi Society for Geosciences 2016
Abstract The study area is located in the western Hoggar Shield (southern Algeria). It includes the In Ouzzal terrane, which consists of Archaean metamorphic rocks. By contrast to other rocks of the Hoggar Shield, the In Ouzzal terrane represents an exception of being neither deformed nor metamorphosed during the Pan-African event, remaining as a rigid block since 2 Ga. Although, previous geophysical works in the area include an airborne magnetometer and gamma-ray spectrometric survey as well as ground gravity and magnetotelluric survey structurally, the study area has not been very well understood. In this paper, we present the interpretation results of the airborne magnetic data by using the 3D Euler deconvolution and the improved Tilt-angle methods. These results reveal the existing of fault systems (FS) occurring within the center of the study area and along the latitude of 22°; the results also suggested that the deepest fault system is oriented NE–SW and is represented by parallel major faults splitting the In Ouzzal terrane into two different parts: northern and southern. The northern part moved northwards, whereas the southern part moved southwards colliding with the Iforas unit. The interpretation confirms that the In Ouzzal terrane and the surrounding Pan-African structures are bound two by two sub-vertical lithospheric faults with the existence
* Lakhdar Harrouchi [email protected]
1
Geophysics Department, FSTGAT/USTHB, P. O., Box 32, Bab Ezzouar, 16111 Algiers, Algeria
2
Sahara Geology Laboratory, Kasdi Merbah University, P. O., Box 511, 30000 Ouargla, Algeria
3
Geology Department, FSTGAT/USTHB, P. O., Box 32, Bab Ezzouar, 16111 Algiers, Algeria
of dextral and sinistral faults in the west and east of the terrane, respectively. Keywords Euler deconvolution . Improved tilt angle . Aeromagnetic data . In Ouzzal terrane . Hoggar
Introduction Euler’s equation has been used by a number of authors for analyzing both magnetic and gravity data. Hood (1965) showed that Euler’s relation could be used to calculate depth to point pole or point dipole, given a measured vertical gradient. Thompson (1982) developed the technique and applied it to profile data. Reid et al. (1990) developed the technique more widely used version for grid-based data. Also, recent improvements in the technique had occurred which includes the estimation of the structural index (Barbosa et al. 1999). Hansen and Suciu (2002) developed a multiple-source generalization of Euler deconvolution (ED), which is capable of handling complex systems that the single-source algorithm can only deal with approximately. In this present study, we will implement the ED, the tilt angle derivative (TAD), and the improved tilt a
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