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Document Type |
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Article In Journal |
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Document Title |
: |
Petrography and Geochemistry of the Dariyah Granite, Central Arabian Shield دراسة صخرية وجيوكيميائية لجرانيت ضرية نوسط الدرع العربي |
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Subject |
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Earth Sciences |
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Document Language |
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English |
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Abstract |
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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. |
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ISSN |
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1012-8832 |
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Journal Name |
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Earth Sciences Journal |
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Volume |
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5 |
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Issue Number |
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1 |
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Publishing Year |
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1412 AH
1992 AD |
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Number Of Pages |
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13 |
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Article Type |
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Article |
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Added Date |
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Sunday, October 11, 2009 |
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Researchers
| محمد عمر نصيف | M. O. NASSIEF | Researcher | | |
| محمد رشاد حسن مفتي | M. R. H. MOUFTI | Researcher | | |
| أحمد حسنين حشاد | A . H. HASHAD | Researcher | | |
|