Cambrian nepheline syenite complex at Jabal Sawda, Midyan region, Kingdom of Saudi Arabia
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Abstract
The only nepheline syenite complex presently known in the Arabian Shield is at Jabal Sawda, about 30 km S of Haql in the extreme NW of Saudi Arabia. It is a post-tectonic, composite intrusion with a crudely concentric structure. A core of leuco-nepheline syenite, a partial ring of mela-nepheline syenite, and an almost complete outer ring of alkali-feldspar syenite are the main rock units. Several mega-inclusions of porphyritic nepheline syenite, nepheline monzosyenite, malignite and ijolite are present in the leuco-nepheline syenite. The chemical composition is notable for very high values of Al2O3, Na2O, Ba, La, Nb, Sr and Zr. U
Pb isotope dating indicates an emplacement age of 553 ± 4 Ma, one of an increasing number of reliable Cambrian isotope dates in the northern Red Sea region.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Cambrian nepheline syenite complex at Jabal Sawda, Midyan region, Kingdom of Saudi Arabia |
| Series title | Journal of African Earth Sciences |
| DOI | 10.1016/S0899-5362(86)80075-6 |
| Volume | 4 |
| Issue | C |
| Year Published | 1986 |
| Language | English |
| Publisher | Elsevier |
| Description | 12 p. |
| First page | 139 |
| Last page | 150 |
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