Regional geochemical study of the felsic plutonic rocks in the Nuqrah quadrangle, sheet 25E, Kingdom of Saudi Arabia

Technical Report · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5089405

Hall, W E; Dellinger, D; Selner, G I

A regional geochemical investigation of the felsic plutonic rocks of the Nuqrah quadrangle, sheet 25 E, Kingdom of Saudi Arabia, in which pan concentrates of 384 wadi samples, and 145 rock samples, were collected, defined two separate and distinct anomalous areas. One area contains Jabal Tuwalah and Jabal Awja, and the other is at the north end of Jabal Safad. Both pan concentrates and the rock samples in the Jabal Tuwalah and Jabal Awja areas contain high concentrations of Be, F, La, Mo, Nb, Pb, Th, U, Sn, Y, and Zr, and the plutons underlying those areas are characterized by high total-count radioactivity. These elements are sited in highly evolved alkalic granites and have not been concentrated into a potentially metalliferous deposit related to a hydrothermal ore system. They may be a potential metal source of the future. Pan-concentration samples collected from wadis draining the north end of Jabal Safad contain anomalous Sn, Mo, Pb, and La. Four samples contain 250 to 1000 ppM of tin. The tin anomaly is associated with a small aplitic pluton intrusive into the Jabal Safad alkalic granite complex. A brief reconnaissance of the area did not reveal any greisen or cassiterite mineralization. However, further exploration work in the area is recommended. 23 refs., 10 figs., 3 tabs.

• Research Organization: Geological Survey, Menlo Park, CA (USA); Geological Survey, Denver, CO (USA)
• OSTI ID: 5089405
• Report Number(s): USGS-OFR-85-25; ON: TI86900053
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GRANITES
GEOCHEMICAL SURVEYS
SAUDI ARABIA
BERYLLIUM
FLUORINE
GEOLOGIC DEPOSITS
LANTHANUM
LEAD
MOLYBDENUM
NIOBIUM
RADIOACTIVITY
THORIUM
TIN
URANIUM
YTTRIUM
ZIRCONIUM
ACTINIDES
ALKALINE EARTH METALS
ASIA
ELEMENTS
HALOGENS
IGNEOUS ROCKS
METALS
NONMETALS
PLUTONIC ROCKS
RARE EARTHS
ROCKS
SURVEYS
TRANSITION ELEMENTS
580400* - Geochemistry- (-1989)