Estimation of Curie-point depths, geothermal gradients and near-surface heat flow from spectral analysis of aeromagnetic data in the Loum – Minta area (Centre-East Cameroon)

Mono, Jean Aimé; Ndougsa‐Mbarga, Théophile; Tarek, Yara; Ngoh, Jean Daniel; Amougou, Olivier Ulrich Igor Owono

doi:10.1016/j.ejpe.2018.07.002

Cited by 16 publications

(11 citation statements)

References 10 publications

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“…The temperature gradient information (map) for the study area was derived from the CPD values calculated. Many authors provided the relationship between the Curie point depth (CPD) and the temperature gradient/heat flow parameters were provided by many authors, e.g., [11,12,22,[49][50][51][57][58][59], among several others.…”

Section: Temperature Gradientsmentioning

confidence: 99%

A Preliminary Geothermal Prospectivity Mapping Based on Integrated GIS, Remote-Sensing, and Geophysical Techniques around Northeastern Nigeria

2021

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Spatial mapping of potential geothermal areas is an effective tool for a preliminary investigation and the development of a clean and renewable energy source around the globe. Specific locations within the Earth’s crust display some manifestations of sub-surface geothermal occurrences, such as hot springs, a volcanic plug, mud volcanoes, and hydrothermal alterations, that need to be investigated further. The present area of investigations also reveals some of these manifestations. However, no attempt was made to examine the prospectivity of this terrain using the efficient GIS-based multicriteria evaluation (MCE) within the scope of the Analytic hierarchy process (AHP). The integration of remote sensing, Geographic information system (GIS), and other geophysical methods (Magnetic and gravity) was performed to map the promising geothermal areas. Multiple input data sets such as aero-magnetic, aero-gravity, aero-radiometric, digital elevation model (DEM), geological map, and Landsat-8 Operational Land Imager (OLI) data were selected, processed, and use to generate five thematic layers, which include heat flow, temperature gradients, integrated lineaments, residual gravity, and lithology maps. The five thematic layers were standardized and synthesized into a geothermal prospectivity map. The respective ranks and weight of the thematic layers and their classes were assigned based on expert opinion and knowledge of the local geology. This research aims to apply an efficient method to evaluate the factors influencing the geothermal energy prospects, identify and map prospective geothermal regions, and, finally, create a geothermal prospectivity model.

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Section: Temperature Gradientsmentioning

confidence: 99%

A Preliminary Geothermal Prospectivity Mapping Based on Integrated GIS, Remote-Sensing, and Geophysical Techniques around Northeastern Nigeria

2021

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“…Moreover, some authors barely indicate which model or conditions were applied (e.g. Azab, 2014;Elitok & Dolmaz, 2008;Ikumbur et al, 2013;Xiong et al, 2016;Li et al, 2017;Mono et al, 2018, Astort et al, 2019, Usman et al, 2019. In many cases, curve fitting is made by hand (completely or partially) which does not represent a problem, except because, in the pursuit of a geologically coherent result, several validity conditions are usually neglected.…”

Section: O R I Gmentioning

confidence: 99%

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

Demarco

Prezzi

Bettucci

2020

Geophysical Journal International

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Summary Spectral methods have been applied for more than 40 years to calculate the depth to magnetic sources and the Curie point depth or Moho depth. Unfortunately, conceptual, theoretical and methodological errors, as well as, subjective approaches and lack of rigor in the application of the method are common. This has affected reproducibility, credibility and confidence in this method. We carried out a detailed mathematical and methodological revision of the spectral methods (centroid, spectral peak, forward and fractal methods) applied to magnetic data for the determination of the depth to magnetic sources. Moreover, a systematic analysis of more than 110 articles was done in order to compile and compare the different approaches and values of key parameters used by different authors in their calculations. We discuss difficulties, conditions and methodological procedures, as well as several misapplications and misinterpretation of the different methods.

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“…The 2D power spectrum technique [8] [36] [37] was used to estimate the maximum depth of magnetic sources.…”

Section: Aeromagnetic Datamentioning

confidence: 99%

“…Following [4] [36] [37] and references therein, for each block, the depth to bottom of magnetic source in the present study is estimated in four main steps using [4] method:…”

Section: Curie Point Depth and Heat Flowmentioning

confidence: 99%

Estimation of Curie Point Depth (CPD) across the Pan African Belt in Northern Cameroon from Aeromagnetic Data

Ngoh¹,

Mbarga²,

Mickus³

et al. 2020

OJER

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The depth to the Curie isothermal point (CPD) was estimated using aeromagnetic data from northern Cameroon. The CPD was estimated using a two-dimensional power density spectral analysis of nineteen 30 × 30 km blocks over a series of Neoproterozoic lithologies associated with the Pan African orogeny. The results show that there are two main regions characterized by the CPD analysis: 1) Shallow depths (~6.37-10.09 km) which are located in several regions including the northern portions of the study area (toward the regions of Hina Marbak, Gawel and northern Moutouroua), the southeast (Kaele region), the south (Guider) and the southwest (Mayo Oulo), and 2) deeper depths (~10.68-13.72 km) are located in the northeast (Mindif) and southwest (southern Moutouroua, Guider and Bossoum). The shallow depths can be related to two tectonic regimes: 1) the West-Central African Rift System with northeast-trending strike-slip faults emanating from the Gulf of Guinea and 2) the Cameroon Volcanic Line. However, the ultimate source of these shallow regions is interpreted to be related to the Cameroon Volcanic Line based on low seismic velocities imaged by recent broadband seismic studies which are concentrated along the northeast-trending strike-slip faults. An additional finding using the CPD depths, a Curie isothermal temperature of 580˚C and a one-dimensional heat flow model, was heat-flow values ranging from 105.68 to 227.63 mW/m 2 , which are above average global heat flow values and are therefore indicative of potential geothermal resources.

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Estimation of Curie-point depths, geothermal gradients and near-surface heat flow from spectral analysis of aeromagnetic data in the Loum – Minta area (Centre-East Cameroon)

Cited by 16 publications

References 10 publications

A Preliminary Geothermal Prospectivity Mapping Based on Integrated GIS, Remote-Sensing, and Geophysical Techniques around Northeastern Nigeria

A Preliminary Geothermal Prospectivity Mapping Based on Integrated GIS, Remote-Sensing, and Geophysical Techniques around Northeastern Nigeria

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

Estimation of Curie Point Depth (CPD) across the Pan African Belt in Northern Cameroon from Aeromagnetic Data

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