Geologic interpretation of geophysical data for the Wadi al Jarir and Al Jurdhawiyah quadrangles, sheets 25/42 C and D, Kingdom of Saudi Arabia

Kleinkopf, M.D.; Cole, James C.

doi:10.3133/ofr83371

Cited by 6 publications

(46 citation statements)

References 6 publications

(21 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aeromagnetic and aero-radiometric data were acquired for the Uqlat as Suqur quadrangle during surveys of the northern Shield (ARGAS, 1967;Andreasen and Petty, 1974). One of the main traverse lines for the Saudi Arabian Kingdom Gravity Net followed the path of the old road from Nuqrah east to Al Qassim, and gravity measurements were made in the vicinity of the Uqlat as Suqur quadrangle (Flanigan and Akhras'J^*/-/^; Kleinkopf and Cole (1982) interpreted aeromagnetic data for the region immediately south of the quadrangle, and similar techniques were used in this study.…”

Section: Previous Investigationsmentioning

confidence: 99%

“…Mapping and interpretation of structural features of the quadrangle, particularly faults and major lithologic boundaries, were guided and enhanced to a significant degree by analysis of aeromagnetic data obtained by aerial surveys during and 1967(ARGAS, 1967. Contoured total-magnetic-field maps at l:100,000-scale were particularly useful for locating and verifying high-angle fault contacts, whereas upward-continued and rotated-to-pole maps at l:250,000-scale (Bureau de Recherches Geologiques et Minieres, Saudi Arabian Mission, unpublished data, 1982) proved more useful in defining the edges of major magnetic-rock units (Kleinkopf and Cole, 1982).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reconnaissance geology of the Uqlat as Suqur Quadrangle, sheet 25/42 A, Kingdom of Saudi Arabia

Cole¹

1985

Open-File Report

Self Cite

View full text Add to dashboard Cite

The geology of the Uqlat as Suqur quadrangle provides a detailed record of the late Proterozoic layered and intrusive rock units,-their interrelationships, and the structural evolution of a large portion of the northeastern Shield of Saudi Arabia. Four major unconformities and three well-defined intrusive episodes identified in the quadrangle provide a rational basis for describing and defining lithostratigraphic units, and for interpreting the deformational history within the region. The oldest rocks consist chiefly of low-potassium mafic and felsic metavolcanic rocks (Dhiran meta-andesite) that were intruded 690 Ma to at least 680 Ma ago by the (possibly cogenetic) Suwaj suite, represented in this quadrangle by low-potassium microdiorite and granodiorite granophyre. The Dhiran-Suwaj terrane was deformed and metamorphosed during a regional erogenic event and became the principal source of clastic material for the Murdama group, which was deposited in subsiding marine basins marginal to emergent highlands. Coarse conglomerate and shallow-water limestone were characteristically deposited near these margins, whereas thick, monotonous sandstone accumulated in the deep-water basin centers. The unlithified Murdama deposits were .gently deformed but regionally folded along north-south trends between rigid blocks-of the Dhiran-Suwaj terrane after about 650 Ma. Regional extension and volcanic activity began at about 640 Ma and produced voluminous calc-alkaline andesite, volcaniclastic sandstone, and volcaniclastic conglomerate of the Jurdhawiyah group. Primary volcanic materials and their rapidly eroded detritus were deposited in linear (probably fault-bounded) basins that were partly shallow-water marine and partly terrestrial. The largest Jurdhawiyah basin began to warp and close during the waning stages of volcanic activity in response to northward-directed compression. High-angle reverse faults displaced the southern basin margin, and a fault-bounded structural arch rose along the northern margin and shed coarse debris into the basin. This intense deformation was closely followed by intrusion of voluminous calc-alkaline granodiorite, diorite, and granite (Idah suite), 620 Ma to 615 Ma ago, that may have been cogenetic with the Jurdhawiyah volcanic rocks. Mineralization is widely associated with this intrusive episode, in the form of gold-bearing quartz veins within and marginal to these plutons. Uplift, erosion, and probable planation characterized the subsequent interval of about 30 Ma, during which no rocks are known to have formed. Beginning at about 585 Ma during a period of regional cratonic extension, high-silica peraluminous granite magma was emplaced in the Qitan complex, and peralkaline magmas were intruded as dikes and extruded as rhyolite and tuff (Humaliyah formation). The Qitan complex and its environs may have potential for tin, tungsten, and(or) base metals.

show abstract

Section: Previous Investigationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reconnaissance geology of the Uqlat as Suqur Quadrangle, sheet 25/42 A, Kingdom of Saudi Arabia

Cole¹

1985

Open-File Report

Self Cite

View full text Add to dashboard Cite

show abstract

“…The "basement" of the Murdama group is sparsely exposed due to younger intrusive rocks, but consists of weakly cataclastic meta-andesite east of (beneath) the Murdama syncline and may include intrusive rocks that are preserved in a complicated plutonic terrane south of Wadi Madraba (Young, 1982;Kleinkopf and Cole, 1982;Cole, 1984a).…”

Section: Geologic Setting and Igneous Controls Of Mineralizationmentioning

confidence: 99%

“…were emplaced during a widespread intrusive event in this part of the shield; thus, they are correlated with the Idah suite (Cole, 1984a). Regional studies (Kleinkopf and Cole, 1982;Boyle and Howes, 1983) have shown the common association of gold deposits with plutons of the Idah suite (Cole, 1984a). These deposits are most common near small stocks emplaced in Murdama group rocks and are characterized by dilational quartz veins that contain gold with minor associated copper.…”

Section: Geologic Setting and Igneous Controls Of Mineralizationmentioning

confidence: 99%

“…The trace element chemistry of the Al Habla granite is distinct, and perhaps more important the type of mineral deposit formed with it is characteristic of the Idah suite. The regional association shows that, whether the Idah suite intrusion is granodiorite, diorite, or granite, the typical mineral deposit contains free gold and minor base metals in late-stage dilational quartz veins within the pluton or in the contact-metamorphosed aureole of Murdama metasediments (Kleinkopf and Cole, 1982;Boyle and Howes, 1983;Cole, 1984a) . The source for the gold and base metals, therefore, would seem to be the Murdama because it is the common factor.…”

Section: Geologic Setting and Igneous Controls Of Mineralizationmentioning

confidence: 99%

See 1 more Smart Citation