Tungsten anomalies in the Uyaijah ring structure, Kushaymiyah igneous complex, Kingdom of Saudi Arabia - Section A, Geology and geochemistry of the Uyaijah ring structure; Section B, Regional geophysics
Open-File Report
75-657
By: P. K. Theobald, Glenn H. Allcott, Vincent J. Flanigan, and Gordon E. Andeasen
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Abstract
Anomalous amounts of tungsten, molybdenum, and bismuth are present in the Uyaijah ring structure of the Kushaymiyah igneous complex in the eastern part of the Precambrian shield of the Kingdom of Saudi Arabia. The complex includes four major rock units, the Murdama Group, porphyritic granodiorite, quartz monzonite, alkaline granite, and areas enriched in silica. Structural and compositional relationships among some of the rock units are defined in part by aeromagnetic and gamma-ray spectrometric geophysical data. Geochemical data from -10 +30 mesh surficial debris were primarily related to the composition of the major rock units, whereas data from heavy-mineral concentrates were used to establish the location of tungsten-molybdenum-bismuth anomalies.
Two areas of about 40 sq km each are occupied by tungsten-molybdenum-bismuth anomalies interpreted to be related to the alkaline granite. One of these is a contact metasomatic anomaly; the other is related to leakage from an inferred underlying cupola of the alkaline granite. These two anomalous areas are recommended for further investigation
Suggested Citation
Theobald, P., Allcott, G.H., Flanigan, V.J., Andeasen, G.E., 1975, Tungsten anomalies in the Uyaijah ring structure, Kushaymiyah igneous complex, Kingdom of Saudi Arabia - Section A, Geology and geochemistry of the Uyaijah ring structure; Section B, Regional geophysics: U.S. Geological Survey Open-File Report 75-657, v, 86 leaves (some folded) : ill., maps ; 28 cm., https://doi.org/10.3133/ofr75657.
ISSN: 2331-1258 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Tungsten anomalies in the Uyaijah ring structure, Kushaymiyah igneous complex, Kingdom of Saudi Arabia - Section A, Geology and geochemistry of the Uyaijah ring structure; Section B, Regional geophysics |
| Series title | Open-File Report |
| Series number | 75-657 |
| DOI | 10.3133/ofr75657 |
| Year Published | 1975 |
| Language | ENGLISH |
| Publisher | U.S. Dept. of the Interior, Geological Survey, |
| Description | v, 86 leaves (some folded) : ill., maps ; 28 cm. |