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Inclusions in clinopyroxene megacrysts from Marion Island
Dissertation (MSc)--University of Pretoria, 2016.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2017
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| _version_ | 1867613539286384640 |
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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 | © 2017 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, 2016. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/60822 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:45.339Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| 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:2263/60822 Inclusions in clinopyroxene megacrysts from Marion Island Roberts, R.J. (James) u29484317@tuks.co.za Lehong, Keabetswe Dimakatso UCTD Clinopyroxene megacrysts Marion Island Pyroxene megacrysts Crystal growth Mineral chemistry Natural and agricultural sciences theses SDG-04 Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-13 Dissertation (MSc)--University of Pretoria, 2016. Marion Island is a sub-Antarctic island which lies 300 km south of the South West Indian Ridge. The island is extensively affected by two periods of volcanism with the oldest erupting during the Pleistocene and the younger during the Holocene period. This study focused on inclusions present within several enormous megacrysts retrieved from a scoria cone on Marion, named Pyroxene Hill. Microfocus CT, electron microprobe, and Raman spectroscopy are used to identify all the mineral phases present within the clinopyroxene megacrysts as well as to determine their textural relationships in order to visualise their internal features without obliterating any of these rare megacrysts. Inclusions of olivine, Fe-Ti-Al-Cr oxides (magnetite, chromite, and ilmenite), rhomb oxides (hematite) and sulphides were identified. Amphibole was also identified as secondary product. Their textural relationships are used to determine the major magmatic processes and formation mechanisms influencing their formation and preservation. Dehydrogenation-oxidation process was found to be the primary magmatic process driving the formation of mineral phases present. Water was also identified as a crucial phase required in the magmatic system to accelerate rapid growth of the clinopyroxene megacryst. bs2026 Geology MSc Unrestricted SDG-04: Quality education SDG-09: Industry, innovation and infrastructure SDG-13: Climate action 2017-06-05T12:11:00Z 2017-06-05T12:11:00Z 2017-05-10 2016 Dissertation Lehong, KD 2016, Inclusions in clinopyroxene megacrysts from Marion Island, MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/60822> A2017 http://hdl.handle.net/2263/60822 en © 2017 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 Clinopyroxene megacrysts Marion Island Pyroxene megacrysts Crystal growth Mineral chemistry Natural and agricultural sciences theses SDG-04 Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-13 Inclusions in clinopyroxene megacrysts from Marion Island |
| title | Inclusions in clinopyroxene megacrysts from Marion Island |
| title_full | Inclusions in clinopyroxene megacrysts from Marion Island |
| title_fullStr | Inclusions in clinopyroxene megacrysts from Marion Island |
| title_full_unstemmed | Inclusions in clinopyroxene megacrysts from Marion Island |
| title_short | Inclusions in clinopyroxene megacrysts from Marion Island |
| title_sort | inclusions in clinopyroxene megacrysts from marion island |
| topic | UCTD Clinopyroxene megacrysts Marion Island Pyroxene megacrysts Crystal growth Mineral chemistry Natural and agricultural sciences theses SDG-04 Natural and agricultural sciences theses SDG-09 Natural and agricultural sciences theses SDG-13 |
| url | http://hdl.handle.net/2263/60822 |