Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
A contribution to the study of older granites in the Nigerian Precambrian with special reference to the Tegina granite
Rocks of the Older Granite suite occur throughout the Nigerian Precambrian. In part 1 of this thesis an example, the Tegina granite, is examined in detail. In part II the suite as a whole is described and discussed. The granite is an elongate mass covering an area of 49 square miles. Structural anal...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Thesis |
| Language: | English English |
| Published: |
Department of Geological Sciences
2017
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613187913809920 |
|---|---|
| access_status_str | Open Access |
| author | Truswell, J F Truswell, John Francis |
| author_browse | Truswell, J F Truswell, John Francis |
| author_facet | Truswell, J F Truswell, John Francis |
| author_sort | Truswell, J F |
| collection | Thesis |
| description | Rocks of the Older Granite suite occur throughout the Nigerian Precambrian. In part 1 of this thesis an example, the Tegina granite, is examined in detail. In part II the suite as a whole is described and discussed. The granite is an elongate mass covering an area of 49 square miles. Structural analysis indicates its vertical emplacement under internal pressure. The pressure was maintained during the formation of joints and secondary structures. Three petrological units are recognised in the granite. (1) The Main granite, a porphyritic biotite granite. Granodiorite and quartz-diorite in it represent local or marginal contamination. (2) Similar rocks are developed in the zone of banded foliation. In addition, there are remnant bands of granodiorite providing evidence that the 'granite' was formed as granodiorite subsequently 'granitised' with the formation of late phenocrysts of microcline microperthite. (3) The later biotite-muscovite microgranite at Karaya. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/23446 |
| institution | University of Cape Town (South Africa) |
| language | eng eng |
| last_indexed | 2026-06-10T12:32:09.918Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| 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:11427/23446 A contribution to the study of older granites in the Nigerian Precambrian with special reference to the Tegina granite A contribution to the study of older granites in the Nigerian Precambrian, with special reference to the Tegina granite Truswell, J F Truswell, John Francis Geology Rocks of the Older Granite suite occur throughout the Nigerian Precambrian. In part 1 of this thesis an example, the Tegina granite, is examined in detail. In part II the suite as a whole is described and discussed. The granite is an elongate mass covering an area of 49 square miles. Structural analysis indicates its vertical emplacement under internal pressure. The pressure was maintained during the formation of joints and secondary structures. Three petrological units are recognised in the granite. (1) The Main granite, a porphyritic biotite granite. Granodiorite and quartz-diorite in it represent local or marginal contamination. (2) Similar rocks are developed in the zone of banded foliation. In addition, there are remnant bands of granodiorite providing evidence that the 'granite' was formed as granodiorite subsequently 'granitised' with the formation of late phenocrysts of microcline microperthite. (3) The later biotite-muscovite microgranite at Karaya. 2017-01-26T13:54:41Z 2017-01-26T13:54:41Z 1960 2016-11-22T11:08:38Z Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/23446 eng eng application/pdf Department of Geological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Geology Truswell, J F Truswell, John Francis A contribution to the study of older granites in the Nigerian Precambrian with special reference to the Tegina granite |
| thesis_degree_str | Doctoral |
| title | A contribution to the study of older granites in the Nigerian Precambrian with special reference to the Tegina granite |
| title_full | A contribution to the study of older granites in the Nigerian Precambrian with special reference to the Tegina granite |
| title_fullStr | A contribution to the study of older granites in the Nigerian Precambrian with special reference to the Tegina granite |
| title_full_unstemmed | A contribution to the study of older granites in the Nigerian Precambrian with special reference to the Tegina granite |
| title_short | A contribution to the study of older granites in the Nigerian Precambrian with special reference to the Tegina granite |
| title_sort | contribution to the study of older granites in the nigerian precambrian with special reference to the tegina granite |
| topic | Geology |
| url | http://hdl.handle.net/11427/23446 |
| work_keys_str_mv | AT truswelljf acontributiontothestudyofoldergranitesinthenigerianprecambrianwithspecialreferencetotheteginagranite AT truswelljohnfrancis acontributiontothestudyofoldergranitesinthenigerianprecambrianwithspecialreferencetotheteginagranite AT truswelljf contributiontothestudyofoldergranitesinthenigerianprecambrianwithspecialreferencetotheteginagranite AT truswelljohnfrancis contributiontothestudyofoldergranitesinthenigerianprecambrianwithspecialreferencetotheteginagranite |