Abstract
Deep seismic sounding in Namibia (South West Africa) were carried out in July / August 1975 by a German-Southafrican team. Three profiles were observed to study the crustal structure and the nature of the crust-mantle boundary of the Damara Orogen with regard to its evolution, supplementing extensive geological and petrological investigations.
Profile I (350 km length — 6 shotpoints) in the Central Zone of the Damara Orogen. In the upper crust two velocity inversions are found. The crust-mantle boundary is a transition zone of variable width rising slightly from a depth of 47 km towards the Atlantic coast.
Profile II (225 Ion length — 2 shotpoints) in the Southern Zone of the Damara Orogen. It shows relatively high velocities in the upper and middle crust. Because of the limited length only poor information is obtained on the crust-mantle boundary.
Profile III (300 km length — 3 shotpoints) was placed, for reference, on the Kalahari Craton which is adjoining the Damara Orogen in the south. In contrast to Profile I no velocity inversions are found in the upper crust. On this profile the Moho appears as a more distinct discontinuity split into an upper level at 47 km and a lower level at 60 km approximately. There is also no indication of a “mountain root”. The interpretation is based on composite plane layer models with variable velocities.
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References
Abbas, S. (1980) Auswertung refraktionsseismischer Messungen im Gebiet des Damara- Orogens in Südwestafrika,- Thesis, Frankfurt Univ.
Eentley, C.R. (1974) Crustal structure of Antarctica,- In: The structure of the earth’s crust (St. Müller, ed.), Elsevier-Amsterdam, pp. 229–240.
Berckhemer, H. (1970) MARS 66, Eine Magnetbandapparatur für seismische Tiefensondierung.- Z. Geophys., 36, 501–518.
Berckhemer, H. (1975) Deep seismic soundings in the Afar region and on the highland of Ethiopia.- In: Afar Depression of Ethiopia (A. Pilger & A. Rosier, eds.), Schweizerbart, Stuttgart, pp. 89–107.
Cleary, J. (1974) Australian crustal structure.- In: The structure of the earth’s crust (St. Müller, ed.), Elsevier-Amsterdam, 241–248
Fielitz, K. (1971) Untersuchungen von Kompressions- und Scherwellengeschwindigkeiten in Gesteinen unter erhöhtem Druck.- Z. Geophys., 37, 943–956.
Gajewski, D. (1981) Scher und Wechselwellen zur Interpretation tiefenseismischer Messungen im Kalahari-Kraton, Namibia.- Thesis, Clausthal Univ.
Giese, P., Prodehl, C. & Stein, A. (eds.) (1976) Explosion seismology in central Europe - data and results.- Springer, Berlin Heidelberg New York, 429 pp.
Green, R.W.E. (1973) A portable multi-channel seismic recorder and a data processing system.- Bull. Seism. Soc. Amer., 63, 2, 423–431.
Green, R.W.E. (1979) A data acquisition and processing system, with applications to seismological problems in southern Africa.- Ph.D.Thesis, University of the Witwatersrand, Johannesburg.
Grimsel, C. (1981) Scher- und Wechselwellen zur Interpretation tiefenseismischer Messungen im Damara-Orogen, Namibia.- Thesis, Clausthal Univ.
Haackv U. (1983) The cooling history of the Damara Orogen.- This vol.
Jones, A.G. (1981) On a type classification of lower crustal layers under Precambrian regions.- J. Geophys., 49, 226–233.
Kern, H. & Richter, A. (1981) Temperature derivatives of compressional and shear wave velocities in crustal and mantle rocks at 6 kbar confining pressure.- J. Geophys., 49, 47–56.
Martin, H. & Porada, H. (1977) The intracratonic branch of the Damara Orogen in South West Africa. I. Discussion of geodynamic models.- Precambrian Res., 5, 311–338.
Miller, H., Gebrande, H. & Schmedes, E. (1977) Ein verbessertes Strukturmodell für die Ostalpen.- Geol. Rdsch., 66, 289–308.
Narain, H. (1974) Crustal structure of the Indian subcontinent.- In: The structure of the earth’s crust (St. Müller, ed.), Elsevier-Amsterdam, pp. 249–260.
Porada, H. (1975) Stratigraphie und Fazies des südlichen Damara-Eelts.- In: Report, Sonderforschungsbereich 48, Univ. Göttingen, 40–50.
Prodehl, C. (1979) Crustal structure of the western United States.- U.S. Geol. Surv. Prof. Pap., 1034, 74 pp.
Van Zijl, J.S.V. (1981) Resistivity structure of the Damara Orogen as deduced from deep electric soundings.- Abstr.
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Baier, B. et al. (1983). Deep Seismic Sounding in the Area of the Damara Orogen, Namibia, South West Africa. In: Martin, H., Eder, F.W. (eds) Intracontinental Fold Belts. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69124-9_39
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DOI: https://doi.org/10.1007/978-3-642-69124-9_39
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