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Geochemistry and spatial variation in dolerites of the Drakensberg Group, Karoo Supergroup, South Africa
Dissertation (MSc (Geology))--University of Pretoria, 2022.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613644426051584 |
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| access_status_str | Open Access |
| author2 | Roberts, R.J. (James) |
| author_browse | Roberts, R.J. (James) |
| author_facet | Roberts, R.J. (James) |
| collection | Thesis |
| dc_rights_str_mv | © 2022 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Geology))--University of Pretoria, 2022. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/84383 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:25.358Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/84383 Geochemistry and spatial variation in dolerites of the Drakensberg Group, Karoo Supergroup, South Africa Roberts, R.J. (James) u04541686@tuks.co.za Kotze, Arnoldus Daniel UCTD Igneous Petrology Karoo Volcanics Geochemistry Karoo Supergroup Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-13 Natural and agricultural sciences theses SDG-15 Dissertation (MSc (Geology))--University of Pretoria, 2022. The Karoo Large Igneous Province (KLIP) in South Africa comprises a spatially limited basalt suite (Drakensberg Group) and a spatially extensive dolerite suite. This study aims to establish a tectonic regime that could have facilitated the KLIP and the extent of geochemical variation in the dolerite suite. Principal component analysis (PCA) is used to identify trends as this multivariate statistical operation is particularly well suited to identifying possible petrological processes. Major and trace element chemistry is interpreted from data made available by GeoROC, a public geochemical data depository. This study observed 139 samples of which 49 were basalts and 90 were dolerites, sampled along a c. 1500 km E-W tract along the southern margins of the Karoo basin. Disassociations between the KLIP and surficial manifestations of mantle plumes are discussed. Transition metal chemistry is described using Co, Cr, Cu, Ni, V, and Zn; however, anomalies in the transition metal data resulted in only LILs (Ba, Sr, and Rb) and HFSEs (Nb and Zr, and the REEs Ce, La, Nd, and Y) being used to investigate spatial variation in the KLIP. Spatial variation could not be inferred with major element chemistry nor with trace element chemistry, and the data is remarkably compatible to the lower crust. Although it is suggested that gravity could have been a driving force behind the KLIP, further studies must be done to provide a better understanding of the relationships between the KLIP and its host geology. National Research Foundation CSUR 121267 bs2026 Geology MSc (Geology) Unrestricted SDG-09: Industry, innovation and infrastructure SDG-13: Climate action SDG-15: Life on land 2022-03-08T08:39:36Z 2022-03-08T08:39:36Z 2022-04-28 2022-03-08 Dissertation Kotze, AD & Roberts, RJ, 2022, Geochemistry and spatial variation in dolerites of the Drakensberg Group, Karoo Supergroup, South Africa, MSc thesis, University of Pretoria A2022 http://hdl.handle.net/2263/84383 en © 2022 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Igneous Petrology Karoo Volcanics Geochemistry Karoo Supergroup Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-13 Natural and agricultural sciences theses SDG-15 Geochemistry and spatial variation in dolerites of the Drakensberg Group, Karoo Supergroup, South Africa |
| title | Geochemistry and spatial variation in dolerites of the Drakensberg Group, Karoo Supergroup, South Africa |
| title_full | Geochemistry and spatial variation in dolerites of the Drakensberg Group, Karoo Supergroup, South Africa |
| title_fullStr | Geochemistry and spatial variation in dolerites of the Drakensberg Group, Karoo Supergroup, South Africa |
| title_full_unstemmed | Geochemistry and spatial variation in dolerites of the Drakensberg Group, Karoo Supergroup, South Africa |
| title_short | Geochemistry and spatial variation in dolerites of the Drakensberg Group, Karoo Supergroup, South Africa |
| title_sort | geochemistry and spatial variation in dolerites of the drakensberg group karoo supergroup south africa |
| topic | UCTD Igneous Petrology Karoo Volcanics Geochemistry Karoo Supergroup Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-13 Natural and agricultural sciences theses SDG-15 |
| url | http://hdl.handle.net/2263/84383 |