Isostasy of Africa

Hartley, Roxby W.; Watts, A. B.; Fairhead, J. D.

doi:10.1016/0012-821x(95)00185-f

Cited by 77 publications

(51 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In Aïr, Jallouli (1989) estimated the thickness of the elastic lithosphere to be 20-30 km which is thin for a continental environment, but comparable to what is commonly observed in rift zones (Poudjom Djomani, 1993). Hartley et al (1996) estimated a particularly thin elastic thickness for the lithosphere in the general region of the CL and Poudjom Djomani et al (1997), in a more local study, with similar data sets but using somewhat different analytical procedures, found both crustal thickness and elastic thickness of lithosphere to be unusually thin in the continental part of the CL. For example, their map of crustal thickness (their Fig.…”

Section: Swell-and-basin Structures and Magmatic Provincesmentioning

confidence: 96%

The North–South Paleozoic to Quaternary trend of alkaline magmatism from Niger–Nigeria to Cameroon: Complex interaction between hotspots and Precambrian faults

Ngako

Njonfang

Aka

et al. 2006

Journal of African Earth Sciences

159

View full text Add to dashboard Cite

Section: Swell-and-basin Structures and Magmatic Provincesmentioning

confidence: 96%

The North–South Paleozoic to Quaternary trend of alkaline magmatism from Niger–Nigeria to Cameroon: Complex interaction between hotspots and Precambrian faults

Ngako

Njonfang

Aka

et al. 2006

Journal of African Earth Sciences

159

View full text Add to dashboard Cite

“…199<S; Tinker, 2001;Tinker el cil.. 2002), or the -l.S Ga lectotii.sm may have reduced the inechanital strength of the underlying lithosphere. Associated lilhospheric decoupling wilhin a ductile lower critst (Abets and Lyon-Caen, 1990;Burov and Diament, 1995;1996;Brown and Phillips. 2000;Doucoure atid de Wit, 2002) may lower its elastic thicktiess further still.…”

Section: Discussionmentioning

confidence: 99%

Old, strong continental lithosphere with weak Archaean margin at 1.8 Ga, Kaapvaal Craton, South Africa

Tinker

Wit

Royden

2004

South African Journal of Geology

View full text Add to dashboard Cite

“…The factor which expresses the apparent strength of the lithosphere is the flexural rigidity, D, and it is often emphasized by means of T e . Using the admittance function (Appendix), and depending on the geological loads in the crust and upper mantle, frequency content analyses between topography and gravitational anomalies have been performed and studies on the estimates of isostatic model carried out (DORMAN and LEWIS, 1970;MCKENZIE and BOWIN, 1976;MCKENZIE and FAIRHEAD, 1997;ZUBER et al, 1989;HARTLEY et al, 1996;WATTS, 2001;RAJESH and MISHRA, 2003;PAMUKÇU, 2004;YURDAKUL et al 2005;PAMUKÇU and YURDAKUL, 2006;LUIS and NEVES, 2006, PAMUKÇU and YURDAKUL, 2008). Under the guidance of these studies, we examined the compensation mechanism of the region through effective elastic thickness (T e ) which was determined using the admittance function.…”

Section: Introductionmentioning

confidence: 99%

Isostasy of the Eastern Anatolia (Turkey) and Discontinuities of its Crust

Pamukçu

Akçiğ

2010

Pure Appl. Geophys.

View full text Add to dashboard Cite

This paper presents a probable isostatic model of the East Anatolian Region, which lies in a belt of significant plate movements. Probable locations of the horizontal and vertical discontinuities in the crust structure were determined using the normalized full gradient (NFG) method. For the purpose of explaining the mechanism that supports topography corresponding to the crust thickness in the region, calculations of effective elastic thickness (T e ) were carried out initially by utilizing admittance and misfit functions. According to these results, the effective elastic thickness value obtained was less than the crust thickness, even though the isostatic model does not conform with the Airy model. Consequently, it was assumed that there could be problems beneath the crust. Hence, the NFG method was applied on the Bouguer gravity data of the region in order to investigate probable discontinuities in the crust structure. According to the NFG results, vertical structural transitions were observed at a depth ranging between 10 and 30 km, which begin immediately north of the Bitlis Zagros Suture Zone (BZSZ) and continue in a northerly direction. The relationship between the effective elastic thickness (T e ; 13 km in average as determined in the last stage), and the seismogenic zone in the region was investigated. If the T e value happens to be less then the crustal thickness, then one can say that there are problems in the crustal structure of the region similar to Eastern Anatolia. Indeed, when NFG results of the study area are examined, numerous vertical and horizontal discontinuities in the crust can be observed. These discontinuities, which correspond to low Bouguer gravity anomalies and shallow focal depth-earthquakes, are probably the source of the factors which rule the tectonic mechanism of the region.

show abstract

Isostasy of Africa

Cited by 77 publications

References 42 publications

The North–South Paleozoic to Quaternary trend of alkaline magmatism from Niger–Nigeria to Cameroon: Complex interaction between hotspots and Precambrian faults

The North–South Paleozoic to Quaternary trend of alkaline magmatism from Niger–Nigeria to Cameroon: Complex interaction between hotspots and Precambrian faults

Old, strong continental lithosphere with weak Archaean margin at 1.8 Ga, Kaapvaal Craton, South Africa

Isostasy of the Eastern Anatolia (Turkey) and Discontinuities of its Crust

Contact Info

Product

Resources

About