Application of 3D Euler deconvolution and improved tilt angle to the aeromagnetic data of In Ouzzal terrane, western Hoggar, Algeria

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 of dextral and sinistral faults in the west and east of the terrane, respectively.

Development of a Hybrid Fixed-Wing UAV Aeromagnetic Survey System and an Application Study in Chating Deposit

“…However, it has faced two major challenges: the problem of multiple solutions and the problem of computation time. Scholars have addressed these two issues by imposing additional constraints to constrain the inversion process and by carrying out deep research and applying optimizing inversion algorithms and using multi-core parallel technology to improve computation speed [30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

“…inversion algorithms and using multi-core parallel technology to improve computation speed [30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Review of Curie point depth determination through different spectral methods applied to magnetic data

“…Okubo et al, 1985;Tselentis, 1991;Tsokas et al, 1998;Stampolidis & Tsokas, 2002;Dolmaz et al, 2005a, b;Elitok & Dolmaz, 2008;Manea & Manea, 2011;Selim & Aboud, 2014; among others). For example, Okubo et al (1985) and Tselentis (1991) recommended the application of high-pass filters; Dolmaz et al (2005a, b) used a band pass filter, Selim & Aboud (2014) applied low-pass filters; meanwhile others eliminated the first component of the field through polynomial approximation, upward continuations or other methods (Li et al 1996;Qingqing et al, 2008;Rajaram et al, 2009;Harrouchi et al, 2016;Abdel Zaher et al 2018;Aliyu et al, 2018;among others). However, authors like and Ravat et al (2007) challenged this long-held view, warning that the data should not be filtered to eliminate regional fields, because such filtering leads to the elimination of significant information from the spectrum, precisely the information related to the deeper layers, which are of interest in this kind of studies.…”

“…They calculate several Z t and Z o in different ranges of n, arguing that the different slopes observed in the spectrum reflect the distinct layers involved (e.g Connard et al, 1983;Hildenbrand et al, 1993;Nwobgo, 1998;Ebbing et al, 2009;Abbass & Mallam, 2013;. Guimaraes, 2014;Azab, 2014;Saibi et al, 2015;Gomes et al, 2015;Harrouchi et al, 2016;Abderbi et al, 2017;Mousa et al, 2017). However, the theoretical background for such interpretations is not clear, as it contradicts the Downloaded from https://academic.oup.com/gji/article-abstract/doi/10.1093/gji/ggaa361/5881306 by guest on 05 August 2020…”