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Jabal Silsilah tin prospect, Najd region, Kingdom of Saudi Arabia

Journal of African Earth Sciences

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Abstract

A significant Sn deposit at Jabal Silsilah (26??07???N, 42??41???E), a prominent ring complex in the NE Arabian Shield, is associated with greisen in flat-topped cupolas of a highly evolved, zinnwaldite- and topaz-bearing alkali-feldspar granite. This granite is peraluminous, enriched in incompatible trace elements and characterized by a chondrite-normalized REE profile showing a large negative Eu anomaly, but otherwise flat. It is overlain by a carapace of aplite and pegmatite, beneath which accumulated residual fluids caused greisenization and deposition of disseminated cassiterite. Quartz-wolframite veins cut both granite and carapace. The other components of the Silsilah complex, from oldest to youngest, are: alkaline dacite, peralkaline granite and hypabyssal rocks. Their occurrence in a single ring structure and geochemical affinities indicate that they comprise a differentiation series. Fractionation of sodic plagioclase, apatite and Fe and Ti oxides resulted in parental alkaline dacite magma becoming peralkaline and granitic. Subsequent fractionation of alkali feldspar, soda pyribole and zircon resulted in a peraluminous melt enriched in incompatible trace elements. ?? 1986.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Jabal Silsilah tin prospect, Najd region, Kingdom of Saudi Arabia
Series title:
Journal of African Earth Sciences
Volume
4
Issue:
C
Year Published:
1986
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of African Earth Sciences