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Geochemistry and preliminary assessment of resource potential for postorogenic granites of the southwestern Arabian Shield, Kingdom of Saudi Arabia

Open-File Report 87-509

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Abstract

Geochemical data for samples from 55 postorogenic plutons of the southwestern Arabian Shield show that these granitoids are generally less evolved than similar granitoids of the eastern Arabian Shield. Radioelement contents are low to normal relative to typical granitic rocks and uranium contents are distinctly low relative to rocks of the eastern Arabian Shield. The data indicate low favorability for ore deposits of elements that are typically enriched in granites at the end stages of magmatism such as tin, tungsten, niobium, tantalum, molybdenum, rare-earth elements, and radioactive elements.

Regional geochemical patterns are not consistent with the north-south trending microplate boundary that has been proposed by other workers. Correlation coefficients for trace-element data obtained during the current study also argue against sharp compositional breaks in the protolith for the postorogenic granites. Consideration of the data presented here and similar data for granitoids of the eastern Arabian Shield, suggest the existence of a compositionally gradational protolith of continental affinity to the east and oceanic affinity to the west.

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Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Geochemistry and preliminary assessment of resource potential for postorogenic granites of the southwestern Arabian Shield, Kingdom of Saudi Arabia
Series title:
Open-File Report
Series number:
87-509
Year Published:
1987
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Description:
i, 59 p.
Country:
Saudi Arabia
Online Only (Y/N):
N
Additional Online Files (Y/N):
N