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The diorites of Yzerfontein, Darling, Cape Province
Thesis (MSc)--Stellenbosch University, 1951.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867614081236598785 |
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| access_status_str | Open Access |
| author | Maske, S |
| author2 | Stellenbosch University. Faculty of Arts and Social Sciences. Department of Geography and Environmental Studies. |
| author_browse | Maske, S Stellenbosch University. Faculty of Arts and Social Sciences. Department of Geography and Environmental Studies. |
| author_facet | Stellenbosch University. Faculty of Arts and Social Sciences. Department of Geography and Environmental Studies. Maske, S |
| author_sort | Maske, S |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--Stellenbosch University, 1951. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/56432 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:46:21.556Z |
| 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:10019.1/56432 The diorites of Yzerfontein, Darling, Cape Province Maske, S Stellenbosch University. Faculty of Arts and Social Sciences. Department of Geography and Environmental Studies. Diorite -- South Africa -- Yzerfontein Geology -- South Africa -- Yzerfontein Igneous rocks -- South Africa -- Yzerfontein UCTD Thesis (MSc)--Stellenbosch University, 1951. This paper was awarded the Corstorphine Medal and the first prize of the Geological Society of South Africa for the year 1951. ENGLISH ABSTRACT: The recent suggestion of the existence of a basaltic magma in the South-west Cape Province shortly before the intrusion of the Cape granites is corroborated by the occurrence of a gabbroic body of pre-granite age at Yzerfontein. A detailed study of the primary rhythmic banding and igneous lamination of this body indicates its origi nal form as being sheet-like or Iaccolithic, and the differentiation appears to have been due to a combination of fractional crystallisation and gravitative crystal settling on to a sub-horizontal floor . The crystal settling process was probably later a rrested by the viscosi ty of the rest magma, due to its enrichment in potash and alumina. The Yzerfontein diorites proper represent a hybrid product resulting from the mixi ng, in dept h, of the marginal contaminated facies of the Darling granite with gabbroic material. The present uniformity of the diorite is ascribed to the emplacement of the hybrid magma to a higher level. Gabbroic xenocrysts a re widely distributed in the diorites, these single crystals almost invariably being surrounded by rims of material later in the reaction series. Amongst the mafic minerals a uniform orientation relation is found to exist between the cores and rims of such reaction products. Two different types of granite aplite and pegmatite, namely potash-rich and soda-rich varieties, have invaded both the diorites and gabbros along joints corresponding in direction to the joint system of the Darling granite pluton, while swarms of veins and dykes containing late hydrothermal minerals, which probably represent the final stages of the magmatic history of the granites, follow similar directions. AFRIKAANSE OPSOMMING: Geen Afrikaanse opsomming beskikbaar nie Masters 2012-08-27T11:37:58Z 2012-08-27T11:37:58Z 1951-12 Thesis http://hdl.handle.net/10019.1/56432 en_ZA Stellenbosch University 25-68 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Diorite -- South Africa -- Yzerfontein Geology -- South Africa -- Yzerfontein Igneous rocks -- South Africa -- Yzerfontein UCTD Maske, S The diorites of Yzerfontein, Darling, Cape Province |
| title | The diorites of Yzerfontein, Darling, Cape Province |
| title_full | The diorites of Yzerfontein, Darling, Cape Province |
| title_fullStr | The diorites of Yzerfontein, Darling, Cape Province |
| title_full_unstemmed | The diorites of Yzerfontein, Darling, Cape Province |
| title_short | The diorites of Yzerfontein, Darling, Cape Province |
| title_sort | diorites of yzerfontein darling cape province |
| topic | Diorite -- South Africa -- Yzerfontein Geology -- South Africa -- Yzerfontein Igneous rocks -- South Africa -- Yzerfontein UCTD |
| url | http://hdl.handle.net/10019.1/56432 |
| work_keys_str_mv | AT maskes thedioritesofyzerfonteindarlingcapeprovince AT maskes dioritesofyzerfonteindarlingcapeprovince |