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Review of the liquid line of descent in iron rich basalts
Dissertation (MSc)--University of Pretoria, 2015.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2015
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| _version_ | 1867613517162479616 |
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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 | © 2015 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)--University of Pretoria, 2015. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/50899 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:24.077Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| 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:2263/50899 Review of the liquid line of descent in iron rich basalts Roberts, R.J. (James) ferreira.marnus@gmail.com Ferreira, Marnus Gert UCTD Liquid line of descent Basaltic magmas Iron-rich basalts Igneous petrology Magmatic differentiation Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-13 Dissertation (MSc)--University of Pretoria, 2015. This research project aims to highlight and identify the main assumptions made, and the methods implemented during the construction of the liquid line of descent (LLD) for iron-rich basalts. The project investigates the potential influence of these assumptions on the resultant LLD. The most important factors involved in the construction of a LLD, namely oxygen fugacity (ƒO2) and H2O are examined and presented here in some detail. Alternative methods for analysing the evolution of these iron-rich rocks are discussed and critically assessed. In order to investigate the assumptions and methods for the construction of the LLD, two case studies were performed on iron-rich intrusions, namely: the Birds River Complex in the Eastern Cape, South Africa; and the Skaergaard layered intrusion, Greenland. For Skaergaard, four of the main LLDs proposed for its liquid evolution were chosen and critically assessed. The Birds River Complex is a small and relatively unknown intrusion, therefore it has received significantly less attention, but presents a good example of a local iron-rich intrusion. These two intrusions were used as testing grounds for the application of the thermodynamic modelling software AlphaMELTS to investigate the potential influence of ƒO2 and H2O on crystallising melts. It was found that H2O had the most significant influence on the maximum iron-enrichment possible for a melt, and that maximum iron-enrichment is attained under anhydrous conditions for all the starting compositions investigated. The effect of ƒO2 was significant, however, its influence varied between starting compositions. tm2015 bs2026 Geology MSc Unrestricted SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production SDG-13: Climate action 2015-11-25T09:54:10Z 2015-11-25T09:54:10Z 2015/09/01 2015 Dissertation Ferreira, MG 2015, Review of the liquid line of descent in iron rich basalts, MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/50899> S2015 http://hdl.handle.net/2263/50899 en © 2015 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 Liquid line of descent Basaltic magmas Iron-rich basalts Igneous petrology Magmatic differentiation Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-13 Review of the liquid line of descent in iron rich basalts |
| title | Review of the liquid line of descent in iron rich basalts |
| title_full | Review of the liquid line of descent in iron rich basalts |
| title_fullStr | Review of the liquid line of descent in iron rich basalts |
| title_full_unstemmed | Review of the liquid line of descent in iron rich basalts |
| title_short | Review of the liquid line of descent in iron rich basalts |
| title_sort | review of the liquid line of descent in iron rich basalts |
| topic | UCTD Liquid line of descent Basaltic magmas Iron-rich basalts Igneous petrology Magmatic differentiation Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-12 Natural and agricultural sciences theses SDG-13 |
| url | http://hdl.handle.net/2263/50899 |