Reconnaissance geology of the Precambrian rocks in the Bi'r Ghamrah quadrangle, Kingdom of Saudi Arabia

Overstreet, William C.; Whitlow, Jesse W.

doi:10.3133/ofr72279

Cited by 5 publications

(14 citation statements)

References 3 publications

(4 reference statements)

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“…Concentrates at this locality are among the most scheelite-rich in the quadrangle, but chemical analyses of the concentrates failed to disclose either tungsten or molybdenum. Threshold quantities of molybdenum were not found in other concentrates from the Jabal Bitran quadrangle, but magnetites with equal abundances of molybdenum are known in the Bi'r Ghamrah and Wadi Mahraghah quadrangles (Overstreet and Whitlow, 1972a;1972. b), where they are associated with even younger igneous rocks than the peralkalic granite.…”

Section: Resultsmentioning

confidence: 96%

“…In the Jabal Bitran quadrangle the term Abt Schist is restricted to rocks in the Murdama Group. Usage followed here for the Bi'r Khountina Group was introduced in the Bi f r Ghamrah quadrangle (Overstreet and Whitlow, 1972a). The Bi'r Khountina Group in the Jabal Bitran quadrangle consists of a basal conglomerate and/or agglomerate overlain by marble which in turn is overlain by an immense but unknown thickness of graywacke and volcanic rocks* These are divided into four formations called, from oldest to youngest, the Idsas Formation, the Fawara Formation, the Abu Sawarir Formation, and the Badriyah Formation.…”

Section: Bi'r Khountina Groupmentioning

confidence: 99%

“…The lower formation is in the Bi'r Khountina Group. The upper formation is in the Murdama Group, named in the Bi'r Ghamrah quadrangle (Overstreet and Whitlow, 1972a) where the usage of Jackson and others (1963) was modified from Mardama Formation to Murdama Group. The name Murdama Group is here extended northward into the Jabal Bitran quadrangle for the conglomerate, graywacke, and marble that overlies the Bi'r Khountina Group.…”

Section: Murdama Groupmentioning

confidence: 99%

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Reconnaissance geology of the Jabal Bitran quadrangle, Kingdom of Saudi Arabia

Kahr¹,

Overstreet²,

Whitlow³

et al. 1972

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The Jabal Bitran quadrangle covers an area of 2833 sq km in the eastern part of the Precambrian Shield in Saudi Arabia. The rocks in the quadrangle are divided geographically along arcuate north-trending lines into an eastern area of granite intruded by a swarm of dikes of rhyolite and andesite, and a western area of dominantly pelitic chlorite-sericite schist, separated by the narrow central complex of the Idsas Range. This complex is composed of pyroclastic rocks, lava, conglomerate, marble, and plutonic mafic rocks that have been intricately modified by episodes of metamorphism, igneous intrusion, and faulting. The Idsas Range contains ancient gold and copper mines, and deposits of magnetite, copper, asbestos, and chromite. * U. S. Geological Survey ** Directorate General of Mineral Resources, Jiddah, Saudi Arabia the Murdama and Bl*t Khduiitina Groups on the west by a narrow dejective zone of the Halabaa and lower Bi't-Khountina. The dejective zone is awch modified by imbricate oVerthrusts attd accompanying tear faults 0 These major faults have |nlshed elements of the Halaban and Bi f r Khcuntina westward over Bi*r Khountina and Murdana, with the result that very complex fault patterns have evolved. Open geochemical reconnaissance of the area disclosed one positive anomaly for nickel and 40 threshold indications of several elements 9 principally nickel, chromium, copper, and tungsten* Heavy-mineral and radicesuric reconnaissance shoved 18 areas containing sehealite and/or pouellite and four areas of anomalous radioactivity* Most of these features ara in the dejective zone, as are five of the nine ancient workings 3 the massive and disseminated magnetite, most of the secondary copper minerals, and the traces of asbestos, magneaite, and chromite known in tho quadrangle. The mantled gneiss dome and a complex of gabbro and amphibolite on its southwestern flank are the next most mineralised areas e Scant evidence of mineralization is present in the Murdama Group west of th® dejective zone. Magnetite deposits at Jabal Idsas have the greatest potential of the mineral deposits in the Jabal Bitran quadrangle. Further study of gold at Fawara and Selib mines is recommended, as is investigation of a positive nickel anomaly that shows threshold cobalt and abovs background radioactivity. The garnetiferous skarn in the east-central part of the quadrangle should be examined for composition and abra«£ ive character of the garnet and for the remote possibility of tungsten in schsalite and beryllium in helvite.

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Section: Resultsmentioning

confidence: 96%

Section: Bi'r Khountina Groupmentioning

confidence: 99%

Section: Murdama Groupmentioning

confidence: 99%

See 1 more Smart Citation

Reconnaissance geology of the Jabal Bitran quadrangle, Kingdom of Saudi Arabia

Kahr¹,

Overstreet²,

Whitlow³

et al. 1972

Open-File Report

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show abstract

“…The Murdama formation was subsequently shown on several of the early 1 :500,000-scale geologic maps of parts of the shield (Jackson and others, 1963;Brown and others, 1963a, b;Bramkamp and others, 1963). The Murdama was first raised to group status in the Bir Gamrah quadrangle by Overstreet and Whitlow ( 1972), but BRGM geologists continued to apply the term Murdama formation in the area between Jabal Murdama and Halaban (Afif belt of this report) (Leca and others, 1972;Letalenet and others, 1972;and other authors). The name Murdama, commonly as a group but locally as a formation, has continued to be used in areas that are extensions of the Afif belt to the north and west (Delfour, 1977(Delfour, , 1981.…”

Section: Murdama Formation and Groupmentioning

confidence: 99%

Stratigraphy of the late Proterozoic Murdama Group, Saudi Arabia

Greene¹

1993

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“…The Murdama was first raised to group status in the Bir Ghamrah quadrangle (Overstreet and Whitlow, 1972); this quadrangle lies directly east of the As Sawadah section of the present report.…”

Section: Murdama Formation and Groupmentioning

confidence: 99%

Stratigraphy of the Murdama Formation between Afif, Halaban, and As Sawadah, Kingdom of Saudi Arabia

Greene¹

1984

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Reconnaissance geology of the Precambrian rocks in the Bi'r Ghamrah quadrangle, Kingdom of Saudi Arabia

Cited by 5 publications

References 3 publications

Reconnaissance geology of the Jabal Bitran quadrangle, Kingdom of Saudi Arabia

Reconnaissance geology of the Jabal Bitran quadrangle, Kingdom of Saudi Arabia

Stratigraphy of the late Proterozoic Murdama Group, Saudi Arabia

Stratigraphy of the Murdama Formation between Afif, Halaban, and As Sawadah, Kingdom of Saudi Arabia

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