The geochemistry of the Alluvial topaz associated with the jurassic kwandonkaya granites in North-East Jos, Nigeria
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Date
1986
Authors
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Publisher
Obafemi Awolowo University, Ile Ife, Nigeria
Abstract
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 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.
Description
100p
Keywords
Geology, Mineral content, Topaz, Granite, Texture, Feldspars, Petrographic studies, Pneumatolytic phase, Miqrolitic cavities, Metals