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Geology of the Silsilah ring complex, and associated tin mineralization, Kingdom of Saudi Arabia - a synopsis.

American Mineralogist

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Abstract

A tin greisen deposit is associated with an alkali-feldspar granite that forms part of a ring complex at Jabal as Silsilah. The petrological and geochemical characteristics of the Fawwarah alkali-feldspar granite resemble those of granites located elsewhere that are also associated with deposits of Sn, W and rare metals. The alkali-feldspar granite is peraluminous, incompatible trace-element-enriched, and is characterized by a flat chondrite-normalized REE pattern that includes a very large, negative Eu anomaly. The distinctive mineralogy of the alkali-feldspar granite includes zinnwaldite and topaz. Differentiation and mineral fractionation controlled magma evolution while components of the ring complex were sequentially emplaced. Evolution of the ring complex and its associated tin deposit concluded with local, intense alteration of the Fawwarah alkali-feldspar granite to a cassiterite-bearing greisen. Samples of greisens suggest that the locus of economic tin deposits is not restricted to the two known, strongly mineralized greisens.-J.A.Z.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geology of the Silsilah ring complex, and associated tin mineralization, Kingdom of Saudi Arabia - a synopsis.
Series title:
American Mineralogist
Volume
70
Issue:
11-12
Year Published:
1985
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1075
Last page:
1086
Number of Pages:
12