The Geochemistry of the Alluvial Topaz associated with the Jurassic kwandonkaya Granites in North-East Jos, Nigeria.
Occurrences of topaz, associated with cassiterite mineralization within the Jurassic younger granite complex in Nigeria has been mentioned by several authors. This project reports the result of an integrated study of the geology, geochemistry, mineralogy and petrogenetic setting of the alluvial topa...
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Obafemi Awolowo University
2014
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| _version_ | 1810764574760108032 |
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| author | Ajayi, Abiola Olanrewaju |
| author2 | Thorbercke, G. |
| author_facet | Thorbercke, G. Ajayi, Abiola Olanrewaju |
| author_sort | Ajayi, Abiola Olanrewaju |
| collection | DSpace |
| description | Occurrences of topaz, associated with cassiterite mineralization within the Jurassic younger granite complex in Nigeria has been mentioned by several authors. This project reports the result of an integrated study of the geology, geochemistry, mineralogy and petrogenetic setting of the alluvial topaz found occurring within the kwandonkaya younger granite complex.
The kwandonkaya granites which field mapping and petrographic studies show to be biotite-granites with slight textural variation most probably bear the euhedral topaz crystals in miarolitic cavities which inundate them. Two major varieties of topaz are found they are the 'colourless' and 'blue' types.
Inclusions occurring within the crystals are mainly rutile rods and two phase fluid inclusions containing water and a gas. The associated minerals are cassiterite, quartz of four varieties, pottassic feldspars, flourite, micas and plagioclase.
Magmatism in the complex was largely restricted to the pneumatolytic phase. A suggested
geochemical prospecting method involves using the number of the miqrolitic cavities per unit area, this takes into account that a higher density is associated with greater mineralization hence a consequent enrichment of surrounding placers with gemstones and economic metals. |
| format | Thesis |
| id | oai:ir.oauife.edu.ng:123456789-3454 |
| institution | My University |
| language | English |
| publishDate | 2014 |
| publisher | Obafemi Awolowo University |
| record_format | dspace |
| spelling | oai:ir.oauife.edu.ng:123456789-34542023-05-13T11:10:35Z The Geochemistry of the Alluvial Topaz associated with the Jurassic kwandonkaya Granites in North-East Jos, Nigeria. Ajayi, Abiola Olanrewaju Thorbercke, G. Geology mineral content topaz kwandonkya granite magmatism petrographic studies pneumatolytic phase miqrolitic cavities Occurrences of topaz, associated with cassiterite mineralization within the Jurassic younger granite complex in Nigeria has been mentioned by several authors. This project reports the result of an integrated study of the geology, geochemistry, mineralogy and petrogenetic setting of the alluvial topaz found occurring within the kwandonkaya younger granite complex. The kwandonkaya granites which field mapping and petrographic studies show to be biotite-granites with slight textural variation most probably bear the euhedral topaz crystals in miarolitic cavities which inundate them. Two major varieties of topaz are found they are the 'colourless' and 'blue' types. Inclusions occurring within the crystals are mainly rutile rods and two phase fluid inclusions containing water and a gas. The associated minerals are cassiterite, quartz of four varieties, pottassic feldspars, flourite, micas and plagioclase. Magmatism in the complex was largely restricted to the pneumatolytic phase. A suggested geochemical prospecting method involves using the number of the miqrolitic cavities per unit area, this takes into account that a higher density is associated with greater mineralization hence a consequent enrichment of surrounding placers with gemstones and economic metals. 2014-08-25T13:40:22Z 2018-10-29T11:09:45Z 2014-08-25T13:40:22Z 2018-10-29T11:09:45Z 1986 Thesis APA http://localhost:8080/xmlui/handle/123456789/3454 en pdf application/pdf North-East Jos, Nigeria. Obafemi Awolowo University |
| spellingShingle | Geology mineral content topaz kwandonkya granite magmatism petrographic studies pneumatolytic phase miqrolitic cavities Ajayi, Abiola Olanrewaju The Geochemistry of the Alluvial Topaz associated with the Jurassic kwandonkaya Granites in North-East Jos, Nigeria. |
| title | The Geochemistry of the Alluvial Topaz associated with the Jurassic kwandonkaya Granites in North-East Jos, Nigeria. |
| title_full | The Geochemistry of the Alluvial Topaz associated with the Jurassic kwandonkaya Granites in North-East Jos, Nigeria. |
| title_fullStr | The Geochemistry of the Alluvial Topaz associated with the Jurassic kwandonkaya Granites in North-East Jos, Nigeria. |
| title_full_unstemmed | The Geochemistry of the Alluvial Topaz associated with the Jurassic kwandonkaya Granites in North-East Jos, Nigeria. |
| title_short | The Geochemistry of the Alluvial Topaz associated with the Jurassic kwandonkaya Granites in North-East Jos, Nigeria. |
| title_sort | geochemistry of the alluvial topaz associated with the jurassic kwandonkaya granites in north east jos nigeria |
| topic | Geology mineral content topaz kwandonkya granite magmatism petrographic studies pneumatolytic phase miqrolitic cavities |
| url | http://localhost:8080/xmlui/handle/123456789/3454 |
| work_keys_str_mv | AT ajayiabiolaolanrewaju thegeochemistryofthealluvialtopazassociatedwiththejurassickwandonkayagranitesinnortheastjosnigeria AT ajayiabiolaolanrewaju geochemistryofthealluvialtopazassociatedwiththejurassickwandonkayagranitesinnortheastjosnigeria |