The geochemistry of the Alluvial topaz associated with the jurassic kwandonkaya granites in North-East Jos, Nigeria

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dc.contributor.authorAjayi, Abiola Olanrewaju
dc.date.accessioned2023-05-13T16:27:51Z
dc.date.available2023-05-13T16:27:51Z
dc.date.issued1986
dc.description100pen_US
dc.description.abstractOccurrences 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 biotitegranites 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.en_US
dc.identifier.urihttps://ir.oauife.edu.ng/123456789/5239
dc.language.isoenen_US
dc.publisherObafemi Awolowo University, Ile Ife, Nigeriaen_US
dc.subjectGeologyen_US
dc.subjectMineral contenten_US
dc.subjectTopazen_US
dc.subjectGraniteen_US
dc.subjectTextureen_US
dc.subjectFeldsparsen_US
dc.subjectPetrographic studiesen_US
dc.subjectPneumatolytic phaseen_US
dc.subjectMiqrolitic cavitiesen_US
dc.subjectMetalsen_US
dc.titleThe geochemistry of the Alluvial topaz associated with the jurassic kwandonkaya granites in North-East Jos, Nigeriaen_US
dc.typeThesisen_US
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