Structural interpretation of gravity anomalies from the Kribi–Edea zone, South Cameroon: a case study

Koumetio, Fidèle; Njomo, Donatien; Tabod, Charles T.; Noutchogwe, Tatchum C.; Manguelle-Dicoum, Eliézer

doi:10.1088/1742-2132/9/6/664

Cited by 24 publications

(30 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Results of these methods, coupled with previous findings in the area [6] [19] and available geological information confirmed the existence of an anomalous body in the area, to which 3D modelling has been applied.…”

Section: Methodssupporting

confidence: 76%

“…In fact, when the contact presents a dip, the maxima of horizontal gradients are displaced progressively down the dip as the height of upward continuation is increased. But in the case of sub-vertical contacts, these maxima remain practically at the aplomb [19].…”

Section: The Horizontal Gradient and Upward Continuationmentioning

confidence: 93%

“…The vertical limits of such an intrusive body can be predicted by the method developed by [19], in which the depth of the top of the anomaly sources obtained after an upward continuation at the height h is greater than or equal to h/2, because the upward continuation at the height h eliminates the effect of the sources situated above the depth h/2. This implies in Figure 6 that the effects of the sources situated above the depth 0.…”

Section: The Local Maxima Map Of the Horizontal Gradient Of The Residmentioning

confidence: 99%

See 2 more Smart Citations

3D Modelling from New and Existing Gravity Data of an Intrusive Body in the Northern Part of Kribi-Campo Sub-Basin in Cameroon

Malquaire¹,

Louise²,

Nfor³

et al. 2017

IJG

View full text Add to dashboard Cite

A new gravity survey was carried out in the northern part of the onshore Kribi-Campo sub-basin in Cameroon. The data were incorporated to the existing ones and then analyzed and modeled in order to elucidate the subsurface structure of the area. The area is characterized in its north-western part by considerably high positive anomalies indicative of the presence of a dense intrusive body. We find, 1) from the analysis of the gravity residual anomaly map, the high positive anomalies observed are the signature of a shallow dense structure; 2) from the multi-scale analysis of the maxima of the horizontal gradient, the structure is confined between depths of 0.5 km and 5 km; 3) from the quantitative interpretation of residual anomalies by spectral analysis, the depth to the upper surface of the intrusive body is not uniform, the average depth of the bottom is h 1 = 3.6 km and the depths to particular sections of the roof of the intrusion are h 2 = 1.6 km and h 3 = 0.5 km; 4) and the 3D modeling gives results that are suggestive of the presence of contacts between rocks of different densities at different depths and a dense intrusive igneous body in the upper crust of the Kribi zone. From the 3D model the dense intrusive igneous block is surrounded by sedimentary formations to the south-west and metamorphic formations to the north-east. Both formations have a density of about 2.74 g/cm 3 . The near surface portions of this igneous block lie at a depth range of 0.5 km to 1.5 km while its lower surface has a depth range of 3.6 km to 5.2 km. The shape of the edges and the bottom of the intrusive body are suggestive of the fact that it forms part of a broader structure underlying the Kribi-Campo sub-basin with a great influence on the sedimentary cover.How to cite this paper: Malquaire, K.P.R.,

show abstract

Section: Methodssupporting

confidence: 76%

Section: The Horizontal Gradient and Upward Continuationmentioning

confidence: 93%

Section: The Local Maxima Map Of the Horizontal Gradient Of The Residmentioning

confidence: 99%

See 1 more Smart Citation

3D Modelling from New and Existing Gravity Data of an Intrusive Body in the Northern Part of Kribi-Campo Sub-Basin in Cameroon

Malquaire¹,

Louise²,

Nfor³

et al. 2017

IJG

View full text Add to dashboard Cite

show abstract

“…Faults are expressed by a quasi-linear disposition of at least three maxima and horizontal limits of intrusive bodies are shown by quasi-circular disposition of many maxima [20].…”

Section: The Horizontal Gradient Methodsmentioning

confidence: 99%

Determination of Structural and Geometrical Parameters of the Kribi-Campo Sedimentary Sub-Basin Using Gravity Data

Malquaire¹,

Clotilde²,

Nfor³

et al. 2017

IJG

View full text Add to dashboard Cite

In order to produce a more detailed structural and geometrical information, and determine sediments thickness along the Kribi-Campo sub-basin, statistical spectral analysis and horizontal gradient analysis of residual anomalies coupled with the Euler deconvolution approach were applied on the gravity data in the area. The results obtained from the 2D spectral analysis on anomaly grids gave a depth to the basement rocks of the basin from 0.60 km to 3.93 km. This represents the thickness of the sedimentary formations overlying the basement. The interpretation of the spectral analysis results indicated that the potential hydrocarbon field areas are situated between Kribi and Lolabe and at Campo given that those areas have the highest sedimentary thicknesses values. From the analysis of the horizontal gradient, deep faults mainly striking SW-NE have been traced and a structural map of the area has been produced. By applying the Euler deconvolution method to the gravity data, information about the depth and trend of the main subsurface structures have been obtained.

show abstract

“…The selection criterion of the regional field is the more objective, as it is based on the correlation between the regional analytical and the regional spectral. This correlation also determines the depth of investigation and takes into account the variations of Bouguer anomalies in all the directions [41] [42]. Indeed, to derive an optimum upward continuation height h 0 for gravity separation, the empirical method of [41] was used.…”

Section: Methods For Estimating the Optimum Upward-continuation Heightmentioning

confidence: 99%

Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50&#176;E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies

Yap¹,

Nouayou²,

Tchato³

et al. 2018

OJG

View full text Add to dashboard Cite

The existence of mafic bodies at mid crustal level beneath the Pan-African Central Cameroon Shear Zone is still a matter of debate. To provide additional constrains on this issue, the crust of the west region of Cameroon has been investigated using gravity data. Analyses of these data show N40-50˚E oriented iso-anomal contours in the Bafoussam area, interpreted as the N40-50˚E branch of the Central Cameroon Shear Zone. In addition, spectral analysis and 2.5D gravity modeling reveal intrusions of mafic bodies at depth between 3.2 and 14.2 km under N40-50˚E aligned volcanic centers, namely Mt Bambouto and Mt Mbapit. The above observations suggest a structurally controlled emplacement of the mafic bodies. In the light of the recent geophysical data, the interaction between the NE-ward channel flow operating at the bottom of the lithosphere or the asthenosphere upwelling and the Cameroon Shear Zone could better explain the magma upwelling in the upper crust. This result is the novelty of the present work.

show abstract

Structural interpretation of gravity anomalies from the Kribi–Edea zone, South Cameroon: a case study

Cited by 24 publications

References 27 publications

3D Modelling from New and Existing Gravity Data of an Intrusive Body in the Northern Part of Kribi-Campo Sub-Basin in Cameroon

3D Modelling from New and Existing Gravity Data of an Intrusive Body in the Northern Part of Kribi-Campo Sub-Basin in Cameroon

Determination of Structural and Geometrical Parameters of the Kribi-Campo Sedimentary Sub-Basin Using Gravity Data

Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50&#176;E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies

Contact Info

Product

Resources

About

Structural interpretation of gravity anomalies from the Kribi–Edea zone, South Cameroon: a case study

Cited by 24 publications

References 27 publications

3D Modelling from New and Existing Gravity Data of an Intrusive Body in the Northern Part of Kribi-Campo Sub-Basin in Cameroon

3D Modelling from New and Existing Gravity Data of an Intrusive Body in the Northern Part of Kribi-Campo Sub-Basin in Cameroon

Determination of Structural and Geometrical Parameters of the Kribi-Campo Sedimentary Sub-Basin Using Gravity Data

Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50&amp;#176;E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies

Contact Info

Product

Resources

About

Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50°E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies