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Petrogenesis of the peralkaline granite (and associated syenite) dykes of the Straumsvola Complex, Western Dronning Maud Land, Antarctica
The Straumsvola nepheline syenite complex in Western Dronning Maud Land, Antarctica consists of an outer massive and inner layered nepheline syenite that is itself intruded by ijolite. The complex and its immediate country rock was intruded by numerous dykes. A small proportion of these dykes are pe...
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| Format: | Thesis |
| Language: | Eng |
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Department of Geological Sciences
2016
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| _version_ | 1867613153220624384 |
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| access_status_str | Open Access |
| author | Dreyer, Tanya Shayna |
| author2 | Harris, Chris |
| author_browse | Dreyer, Tanya Shayna Harris, Chris |
| author_facet | Harris, Chris Dreyer, Tanya Shayna |
| author_sort | Dreyer, Tanya Shayna |
| collection | Thesis |
| description | The Straumsvola nepheline syenite complex in Western Dronning Maud Land, Antarctica consists of an outer massive and inner layered nepheline syenite that is itself intruded by ijolite. The complex and its immediate country rock was intruded by numerous dykes. A small proportion of these dykes are peralkaline syenite and microgranite, and these are found only to intrude the nepheline syenite and not the country rock. The presence of peralkaline granite dykes intruding a silica-undersaturated complex is unexpected, given the thermal divide that exists at low pressures between silica-under and -oversaturated phases. Major and trace element variations in the dykes are found to be consistent with fractional crystallisation of a parental peralkaline magma of trachyte composition. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/19964 |
| institution | University of Cape Town (South Africa) |
| language | Eng |
| last_indexed | 2026-06-10T12:31:35.974Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| 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:11427/19964 Petrogenesis of the peralkaline granite (and associated syenite) dykes of the Straumsvola Complex, Western Dronning Maud Land, Antarctica Dreyer, Tanya Shayna Harris, Chris Le Roux, Petrus Geochemistry The Straumsvola nepheline syenite complex in Western Dronning Maud Land, Antarctica consists of an outer massive and inner layered nepheline syenite that is itself intruded by ijolite. The complex and its immediate country rock was intruded by numerous dykes. A small proportion of these dykes are peralkaline syenite and microgranite, and these are found only to intrude the nepheline syenite and not the country rock. The presence of peralkaline granite dykes intruding a silica-undersaturated complex is unexpected, given the thermal divide that exists at low pressures between silica-under and -oversaturated phases. Major and trace element variations in the dykes are found to be consistent with fractional crystallisation of a parental peralkaline magma of trachyte composition. 2016-06-09T11:15:58Z 2016-06-09T11:15:58Z 2015 Master Thesis Masters MSc http://hdl.handle.net/11427/19964 Eng application/pdf Department of Geological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Geochemistry Dreyer, Tanya Shayna Petrogenesis of the peralkaline granite (and associated syenite) dykes of the Straumsvola Complex, Western Dronning Maud Land, Antarctica |
| thesis_degree_str | Master's |
| title | Petrogenesis of the peralkaline granite (and associated syenite) dykes of the Straumsvola Complex, Western Dronning Maud Land, Antarctica |
| title_full | Petrogenesis of the peralkaline granite (and associated syenite) dykes of the Straumsvola Complex, Western Dronning Maud Land, Antarctica |
| title_fullStr | Petrogenesis of the peralkaline granite (and associated syenite) dykes of the Straumsvola Complex, Western Dronning Maud Land, Antarctica |
| title_full_unstemmed | Petrogenesis of the peralkaline granite (and associated syenite) dykes of the Straumsvola Complex, Western Dronning Maud Land, Antarctica |
| title_short | Petrogenesis of the peralkaline granite (and associated syenite) dykes of the Straumsvola Complex, Western Dronning Maud Land, Antarctica |
| title_sort | petrogenesis of the peralkaline granite and associated syenite dykes of the straumsvola complex western dronning maud land antarctica |
| topic | Geochemistry |
| url | http://hdl.handle.net/11427/19964 |
| work_keys_str_mv | AT dreyertanyashayna petrogenesisoftheperalkalinegraniteandassociatedsyenitedykesofthestraumsvolacomplexwesterndronningmaudlandantarctica |