The deep structure of the Limpopo Belt from geophysical studies

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doi: 10.1016/0301-9268(92)90022-G
Authors:de Beer, J. H.; Stettler, E. H.
Author Affiliations:Primary:
CSIR, Geoexplor. Programme, Pretoria, South Africa
Other:
Univ. Cape Town, South Africa
Volume Title:Special issue; The Archaean Limpopo granulite belt; tectonics and deep crustal processes
Volume Authors:van Reenen, Dirk D., editor; Roering, Chris; Ashwal, L. D.; de Wit, Maarten J.
Source:Precambrian Research, 55(1-4), p.173-186; Granulites and deep crustal tectonics, June 21-July 1, 1990, edited by Dirk D. van Reenen, Chris Roering, L. D. Ashwal and Maarten J. de Wit. Publisher: Elsevier, Amsterdam, International. ISSN: 0301-9268
Publication Date:1992
Note:In English. 29 refs.; illus. incl. sects., sketch map
Summary:Seismic and geoelectrical data sets from studies in the Limpopo belt and adjoining cratons prove that the terrain boundaries of the belt dip in towards it, giving it the appearance of a pop-up structure. The gravity data show that high-grade metamorphic rock with densities that are high compared to the normal low-grade upper crustal granitic rocks, form the upper crust in the N and S marginal zones of the belt. The N boundary of the central zone can be related to a S-dipping zone of seismic reflectors, while the S boundary of this terrain, formed by the Palala shear zone, seems to be near vertical. The greenstone belts of the craton have a limited depth extent and are allochthonous. The present position of these structures could be related to thin-skinned tectonics that affected the upper crust on the Kaapvaal craton andwhich were revealed by seismic reflection data. [R.E.S.]
Subjects:Allochthons; Bouguer anomalies; Deep-seated structures; Density; Electrical methods; Filters; Geophysical methods; Geophysical surveys; Granites; Gravity anomalies; Igneous rocks; Isostasy; Magnetic methods; Metamorphic rocks; Plutonic rocks; Reflection; Seismic methods; Structural geology; Surveys; Tectonics; Terranes; Africa; Kaapvaal Craton; Limpopo Belt; Murchison greenstone belt; South Africa; Southern Africa; Zimbabwe; Zimbabwe Craton; Giyani greenstone belt; Palala shear zone
Abstract Numbers:93M/1150
Record ID:1992015358
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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