Gravity investigation of the Cameroon Volcanic Line in Adamawa region: Geothermal features and structural control

Njeudjang, Kasi; Essi, Jean Marcel Abaté; Kana, Janvier Domra; Teikeu, William Assatse; Nouck, Philippe Njandjock; Djongyang, Noël; Tchinda, René

doi:10.1016/j.jafrearsci.2020.103809

Cited by 18 publications

(11 citation statements)

References 39 publications

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“…The Bouguer gravity anomalies obtained by interpolation were then plotted to create a new Bouguer anomaly map (Figure 2). This map was very similar to the ones obtained by Poudjom-Djomani (1993) and Njeudjang et al (2020).…”

Section: Analysis Of Bouguer Anomaliessupporting

confidence: 89%

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Interpretation of the locally high gravity anomalies using terrestrial gravity data in Bagodo, North Cameroon

Bouba¹,

Njeudjang²,

Yap³

et al. 2022

Earth and Planetary Physics

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Section: Analysis Of Bouguer Anomaliessupporting

confidence: 89%

“…The high anomaly observed on gravity maps is probably due to the effects of these bodies. Apollinaire et al (2018) and Njeudjang et al (2020) previously used similar methods successfully to determine the major subsurface structure of the Adamawa Plateau.…”

Section: Introductionmentioning

confidence: 99%

Interpretation of the locally high gravity anomalies using terrestrial gravity data in Bagodo, North Cameroon

Bouba¹,

Njeudjang²,

Yap³

et al. 2022

Earth and Planetary Physics

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“…These faults are believed to be the main channels of alkaline lava deposition (Le Maréchal and Vincent 1972;Temdjim et al 2005 2010) have conducted geophysical (gravity, seismic, magnetic and magnetotelluric) studies within a regional framework, with particular interest for deep structural correlation outside the crust and sometimes related to underground uid circulation (Toteu et al 2004;Njonfang et al 2006;Njanko et al 2006). Other local studies are related to the crustal structure, geothermal activity along the Cameroon Volcanic Line (CVL) and sedimentary thickness of the basin (Njeudjang et al 2020a;. Kande-Houétchak (2008) study around the Mbere tectonic trough shows that the resistivity of granito-gneissic basement is larger than 10,000 Ω⋅m.…”

Section: Geological and Tectonic Settingmentioning

confidence: 99%

Comprehensive Studies of Hydrogeophysical Potential of Groundwater Occurrences in Djohong Municipality, Adamawa Cameroon

Raouf

Njeudjang

Yue

et al. 2022

Preprint

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Djohong municipality is located at the border between Eastern Cameroon and Central African Republic (CAR), in the Mbere division. The region is a shelter for thousands of people fleeing the socio-political crisis in CAR and it lacks safe drinking water supply. Surface water, rainwater, and shallow groundwater wells are the main water sources. As a result, deep aquifers appear to be an affordable solution to the widespread water demand gap in the region of Djohong. Forty-nine Schlumberger vertical electrical sounding (VES) were carried out in the framework of this study with maximum current electrode spacing of 240 m. The purpose was to investigate the occurrences of groundwater and related structural elements in the study area, which hosts two refugee camps, Ngam and Borgop. Eight geoelectric profiles were realized and their geological characteristics vary from the altered part to the bedrock, with ferruginous sediments and metaconglomerates in between. The altered part is composed of topsoil, travertines, sandy clay, clayey sand, and fractured shales with different geophysical characteristics. Two aquifer systems were highlighted, respectively in the altered soils of clayey sand and low permeability fractured rocks. The upper aquifer made of clayey sand is located in Ngam camp with thickness of 5 to 15 m and resistivity of 700 – 1500 Ω.m. The lower aquifer which is considered the main aquifer is located in both camps. It is hosted in the low permeability fractured shales of the Ngam camp, with resistivity of 200 to 1000 Ω.m and thickness of 34 to 82 m. In the Borgop camp, it occurs in the fractured granitic bedrock at about 8 and 19 m deep. Structurally, the study area is controlled by several potential faults, with NE – SW strike as a whole. The present study highlighted favourable conditions reducing geological and hydrogeological limitations to provision of safe drinking water for refugees of the two camps in Djohong.

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“…The estimated structural index (SI) of the source from the Euler method is useful to determine an optimal depth‐weighting function rate decay for 3D inversion of potential data (Cella & Fedi, 2012; Vatile & Fedi, 2020), and the estimated top depths of source can be used to constrain a more realistic inversion model (Fregoso et al ., 2015). Euler deconvolution has been widely used to interpret potential field data in target detection (Davis et al ., 2010; Mu et al ., 2020), joint inversion (Fregoso et al ., 2015), the interpretation of linear structures, such as faults and geological boundaries (Wang et al ., 2017; Castro et al ., 2020; Njeudjang et al ., 2020; Kumar et al ., 2020; Nuñez Demarco et al ., 2020), and locating crustal anomalous bodies (Ebbing et al ., 2007; Kumar et al ., 2020).…”

Section: Introductionmentioning

confidence: 99%

Ratio‐Euler deconvolution and its applications

Huang

Zhang

et al. 2022

Geophysical Prospecting

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Euler deconvolution of potential field data is widely applied to obtain the location of concealed sources automatically. A lot of improvements have been proposed to eliminate the dependence of Euler deconvolution on the structural index that are based on the use of high‐order derivatives of the potential field and, therefore, sensitive to data noise. We describe the elimination of the dependence on the Ratio‐Euler method, which is based on the original Euler deconvolution function. The proposed method does not involve high‐order derivatives. Testing on simulated and field data indicates that the proposed method has better noise resistance than the existing Tilt‐Euler method, which is based on high‐order derivatives. The proposed method is first applied to the ground magnetic data from Weigang iron deposit, Eastern China. It reveals that the ore body could be approximated by a horizontal prism with a considerable vertical extent with a top depth of 55 m, which are very close to the information obtained from drill holes. In addition, the proposed method works well in estimating the depth to a cavity centre from the ground gravity anomaly.

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Gravity investigation of the Cameroon Volcanic Line in Adamawa region: Geothermal features and structural control

Cited by 18 publications

References 39 publications

Interpretation of the locally high gravity anomalies using terrestrial gravity data in Bagodo, North Cameroon

Interpretation of the locally high gravity anomalies using terrestrial gravity data in Bagodo, North Cameroon

Comprehensive Studies of Hydrogeophysical Potential of Groundwater Occurrences in Djohong Municipality, Adamawa Cameroon

Ratio‐Euler deconvolution and its applications

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