Title: Petrography and Geochemistry of the Dariyah Granite, Central Arabian Shield
Abstract:The Dariyati granite, quarried for the use as a facade for the
Holy Mosques in Makkah and AI-Madinah, belongs to the late-stage
plutonics of the Arabian Shield (585 ± 8 Ma). It is a typicalleucocrat...The Dariyati granite, quarried for the use as a facade for the
Holy Mosques in Makkah and AI-Madinah, belongs to the late-stage
plutonics of the Arabian Shield (585 ± 8 Ma). It is a typicalleucocratic
equigranular coarse-grained 'trans-solvus' granite formed dominantly of
perthite, both orthoclase and microcline, quartz and 9ligoclase. Plagioclase
crystallized first followed by potash feldspar then quartz.
The granite is slightly peraluminous with low Ca, Mg, Fe and Ti contents.
Its Ab-Qz-Or composition indicates a near minimum melt potassic granite'.
Compared to average abundance of granites, it is significantly depleted in
the incompatible elements Ba, Sr, Zr, Ce, La, Y, and Nd. Thronton-Tuttle
indices as well as RblSr and KlRb ratios suggest fairly evolved stage of differentiation.
The initial 87Sr/86Sr ratio (0.7037 ± 0.0003) suggests derivation
from mantle source with limited crustal contamination or by low degree
partial melting of the lower cru:st. Petrochemical and geochemical features
however, support a crustal melt origin.Read More
Publication Year: 1992
Publication Date: 1992-01-01
Language: en
Type: article
Indexed In: ['crossref']
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