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The geology of the northern Algoa basin, Port Elizabeth
Maps scanned in multiple parts
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| Other Authors: | |
| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613809744543744 |
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| access_status_str | Open Access |
| author | Hill, Robert Smyth |
| author2 | Stellenbosch University. Faculty of Science. Department of Earth Sciences. |
| author_browse | Hill, Robert Smyth Stellenbosch University. Faculty of Science. Department of Earth Sciences. |
| author_facet | Stellenbosch University. Faculty of Science. Department of Earth Sciences. Hill, Robert Smyth |
| author_sort | Hill, Robert Smyth |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Maps scanned in multiple parts |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/57054 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:42:03.173Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/57054 The geology of the northern Algoa basin, Port Elizabeth Hill, Robert Smyth Stellenbosch University. Faculty of Science. Department of Earth Sciences. Geology -- South Africa -- Port Elizabeth -- Algoa Basin Geology, Stratigraphic -- South Africa-- Port Elizabeth -- Algoa Basin Volcanic ash, tuff, etc. Paleontology -- Mesozoic UCTD Maps scanned in multiple parts Thesis (M. Sc.) -- University of Stellenbosch, 1972. ENGLISH ABSTRACT: The chief object of this study was to gain insight into the geological events which were connected with the earliest development of the Northern Algoa Basin. Of particular interest was the nature, origin, and stratigraphic significance of the Suurberg basalts and tuffs which are exposed along the periphery of the basin. The main conclusions of the study are the following: i) A marked angular unconformity separates the Mesozoic rocks (including the Suurberg volcanics) within the Algoa Basin from the underlying Paleozoic "floor". No evidence was found to support the existence of the post-Enon "Zuurberg Fault" which had been postulated by earlier workers. ii) The Suurberg volcanic rocks antedate the overlying Uitenhage beds, but the time interval between the two rock groups is small. iii) The Suurberg Group can be subdivided into three rock units. The oldest, the Slagboom Formation, consists mainly of quartzite breccia, which appears to represent the initial vent-opening phase of the volcanism. This is followed by the Coerney Formation which is composed of rhyolitic ash-fall and ash-flow tuffs. The uppermost Mimosa Formation embraces tholeiitic basalt, a few dolerite dykes, and thin interbedded acidic tuffs. iv) The volcanism was a local phenomenon within the Cape Folded Belt and took place subaerially. Eruptions were of a linear type, with the ascend of magmas probably related to pre-Uitenhage faulting. The distribution of volcanic materials was largely controlled by the paleotopography. v) The volcanic rocks originated from two unrelated (though contemporaneously erupted) magmas. The basaltic magma was probably generated in the upper mantle through partial melting and fractionation, while an anatectic origin is indicated for the rhyolitic magma. No intermediate types occur. vi) The Northern Algoa Basin was initiated by downwarping and crustal subsidence, which only followed after the extrusion of the Suurberg basalts. Masters 2012-08-27T11:38:17Z 2012-08-27T11:38:17Z 1972-04 Thesis http://hdl.handle.net/10019.1/57054 en_ZA Stellenbosch University 114 pages : illustrations, maps application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Geology -- South Africa -- Port Elizabeth -- Algoa Basin Geology, Stratigraphic -- South Africa-- Port Elizabeth -- Algoa Basin Volcanic ash, tuff, etc. Paleontology -- Mesozoic UCTD Hill, Robert Smyth The geology of the northern Algoa basin, Port Elizabeth |
| title | The geology of the northern Algoa basin, Port Elizabeth |
| title_full | The geology of the northern Algoa basin, Port Elizabeth |
| title_fullStr | The geology of the northern Algoa basin, Port Elizabeth |
| title_full_unstemmed | The geology of the northern Algoa basin, Port Elizabeth |
| title_short | The geology of the northern Algoa basin, Port Elizabeth |
| title_sort | geology of the northern algoa basin port elizabeth |
| topic | Geology -- South Africa -- Port Elizabeth -- Algoa Basin Geology, Stratigraphic -- South Africa-- Port Elizabeth -- Algoa Basin Volcanic ash, tuff, etc. Paleontology -- Mesozoic UCTD |
| url | http://hdl.handle.net/10019.1/57054 |
| work_keys_str_mv | AT hillrobertsmyth thegeologyofthenorthernalgoabasinportelizabeth AT hillrobertsmyth geologyofthenorthernalgoabasinportelizabeth |