Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
The geochronology and geochemistry of Karoo volcanics in the Lebombo and adjacent areas
Includes bibliographical references.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Geological Sciences
2015
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613258809081856 |
|---|---|
| access_status_str | Open Access |
| author | Bristow, John William |
| author2 | Erlank, A J |
| author_browse | Bristow, John William Erlank, A J |
| author_facet | Erlank, A J Bristow, John William |
| author_sort | Bristow, John William |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/12534 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:17.409Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Department of Geological Sciences |
| publisherStr | Department of Geological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/12534 The geochronology and geochemistry of Karoo volcanics in the Lebombo and adjacent areas Bristow, John William Erlank, A J Duncan, A R Geochemistry Includes bibliographical references. Karoo volcanics of Jurassic to Cretaceous age crop out in the eastern areas of southern Africa. These volcanics are well preserved in the Lebombo monocline which straddles the borders of South Africa, Swaziland and Mozambique, and in the Nuanetsi and Tuli synclines and Sabi monocline of south-east Zimbabwe. Geochronological and geochemical data have been used to evaluate the geochemistry of the rock types found in the above areas, particularly with respect to the mafic volcanics of the Lebombo. In the eastwardly dipping Lebombo monocline, nephelinites overlain by picrite basalts occur in the northern part of the volcanic succession whereas over the remaining area olivine-poor basalts are dominant. Rhyolitic volcanics in the form of massive flows overlie the basaltic rocks and attain their maximum thickness in Swaziland and the southern Lebombo. The rhyolites are notably thinner to the north of Swaziland and are overlain by an upper sequence of olivine-poor lavas with interdigitated rhyolite flows. Basic dykes are ubiquitous in the Lebombo whereas acid dykes, though present, tend to be localised. In Nuanetsi, picrite basalts, olivine-poor basalts and rhyolite flows with interbedded basic lavas crop out ina major synclinal structure. Dyke rocks are common and late Karoo intrusive complexes cut the lavas. Volcanic rocks in the Tuli syncline consist predominantly of picrite basalts and olivine poor lavas, whereas nephelinites, picrite basalts and olivine-poor lavas crop out in the Sabi Monocline. 2015-02-24T04:12:40Z 2015-02-24T04:12:40Z 1980 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/12534 eng application/pdf Department of Geological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Geochemistry Bristow, John William The geochronology and geochemistry of Karoo volcanics in the Lebombo and adjacent areas |
| thesis_degree_str | Doctoral |
| title | The geochronology and geochemistry of Karoo volcanics in the Lebombo and adjacent areas |
| title_full | The geochronology and geochemistry of Karoo volcanics in the Lebombo and adjacent areas |
| title_fullStr | The geochronology and geochemistry of Karoo volcanics in the Lebombo and adjacent areas |
| title_full_unstemmed | The geochronology and geochemistry of Karoo volcanics in the Lebombo and adjacent areas |
| title_short | The geochronology and geochemistry of Karoo volcanics in the Lebombo and adjacent areas |
| title_sort | geochronology and geochemistry of karoo volcanics in the lebombo and adjacent areas |
| topic | Geochemistry |
| url | http://hdl.handle.net/11427/12534 |
| work_keys_str_mv | AT bristowjohnwilliam thegeochronologyandgeochemistryofkaroovolcanicsinthelebomboandadjacentareas AT bristowjohnwilliam geochronologyandgeochemistryofkaroovolcanicsinthelebomboandadjacentareas |