Geology of the Precambrian rocks of the Jabal Habashi Quadrangle, sheet 26F, Kingdom of Saudi Arabia

Johnson, Peter R.; Williams, P.L.; Fuller, F. J.

doi:10.3133/ofr853

Cited by 3 publications

(10 citation statements)

References 8 publications

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“…The age of the Suwaj suite indicates the Murdama group is no older than about 670 Ma and the group is probably no younger than about 655 Ma, based on the apparent age of quartz diorite that intrudes it (Muwashsham pluton of Johnson and Williams, 1984) 30 km north of this quadrangle (Cole and Hedge, The Murdama group is unconformably overlain by the Jurdhawiyah group on the north flank of Jibal Zalma, north of Al Lughfiyah, north of Jabal Idah, and at numerous other localities in the northeastern Shield (Cole, 1984d).…”

Section: Murdama Groupmentioning

confidence: 99%

Reconnaissance geology of the Al Abanat Quadrangle, sheet 25/42 B, Kingdom of Saudi Arabia

Cole¹

1985

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The Al Abanat quadrangle, located approximately midway between An Nuqrah and Buraydah, contains layered and intrusive rocks that represent the major phases of Proterozoic geology in the northeastern Arabian Shield. Lowpotassium metavolcanic rocks of the Dhiran meta-andesite were intruded 690 Ma to about 670 Ma ago by (possibly cogenetic) low-potassium mafic and intermediate rocks of the Suwaj suite. Both units were probably formed by partial melting of oceanic lithosphere above a southwest-dipping subduction zone. The Dhiran-Suwaj terrane was deformed and metamorphosed during a regional orogenic event that may have coincided with the termination of subduction. The orogenic uplift shed abundant fine-grained sandstone (Murdama group) into fault-bounded, subsiding marine basins. The Ata fault, which forms one of the Murdama basin boundaries, is well exposed in this area and its features suggest it was a major left-slip structure prior to Murdama time, but was reactivated as a dip-slip fault during sedimentation. The unlithified Murdama deposits were penecontemporaneously deformed during basin-subsidence and then regionally folded along north-south trends. This period of regional folding appears to pre-date and overlap with intrusion of batholithic granitic rocks of the Khishaybi suite, probably at about 650 Ma. Regional north-south extension and calc-alkaline volcanic activity began at about 640 Ma and produced voluminous andesitic volcanic and volcaniclastic deposits of the Jurdhawiyah group. Primary volcanic materials and their rapidly eroded detritus were deposited in elongate, fault-bounded basins that were partly shallow-water marine and partly terrestrial. The Lughfiyah-Shuhban reverse fault system was active during a brief interval in late Jurdhawiyah time. This deformation was closely followed by intrusion of elliptical bodies of Idah suite granodiorite porphyry, 620 Ma to 615 Ma ago, that may have been cogenetic with the Jurdhawiyah volcanic rocks. The succeeding 30-Ma interval was characterized by uplift, erosion, and probable planation. During a subsequent period of regional cratonic extension from about 585 to 570 Ma, high-silica, evolved granites of the Abanat suite were intruded in ring dikes and composite plutons of the Asmar complex (dominantly peraluminous) and the Ahmar complex (peralkaline). The Asmar complex partially intruded its coeval rhyolitic volcanic cover (Samra rhyolite).

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Section: Murdama Groupmentioning

confidence: 99%

Reconnaissance geology of the Al Abanat Quadrangle, sheet 25/42 B, Kingdom of Saudi Arabia

Cole¹

1985

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“…Are the conglomeratic strata part of the Hibshi formation? Johnson and Williams (1984) and Cole ( 1985) agree that the conglomerate at Jabal umm Sammah is basal Murdama and possibly should be included in the Timiriyat. Because in my view the weight of the evidence (discusssed below) points to the conclusion that the Hibshi formation is the lateral equivalent of the Murdama group, th~ question is moot.…”

Section: Uqlat As Suqur Quadranglementioning

confidence: 99%

“…Johnson and Williams (1984) and Cole ( 1985) both interpreted the conglomerate at Jabal umm Sammah as a basal Murdama conglomerate, possibly the Timiriyat, and not the Hibshi formation. A sketch compilation in Cole and Hedge ( 1986) provided a suggested solution to border problems between Nuqrah and Aban al Ahmar, assigning certain rocks to the postMurdama Jurdhawiyah group and others to a preMurdama layered sequence.…”

Section: Groundmass ----65 45mentioning

confidence: 99%

“…The Hibshi formation has been alternately placed above, in the lower part, and in the upper part of the Murdama group (Bramkamp and others, 1963;Delfour, 1977;Williams, 1983;Johnson and Williams, 1984;Cole, 1985;Cole and Hedge, 1986; this report). Because I see a close relationship between the Hibshi and other parts of the Murdama group, it is included therein and descriptions of some sections are given in the following paragraphs.…”

Section: Hibshi Formationmentioning

confidence: 99%

“…Basins and faults as named by and Johnson and Williams (1984) are shown on plate 2. The basins are in part fault bounded, in part bounded by post-Murdama intrusive rocks, and locally overlapped by the younger Jurdhawiyah group.…”

Section: Structurementioning

confidence: 99%

See 2 more Smart Citations

Stratigraphy of the late Proterozoic Murdama Group, Saudi Arabia

Greene¹

1993

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Lithofacies and depositional environment of the Maraghan Formation, and speculation on the origin of gold in ancient mines, An Najady area, Kingdom of Saudi Arabia

Wallace¹

1987

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The Upper Proterozoic Maraghan formation of the Murdama group is subdivided into five lithofacies units over an area of about 750 sq km near An Najady, in the northern Arabian Shield. The Maraghan formation is composed mainly of sandstone, siltstone, shale, and lesser amounts of limestone, dolomite, and carbonate-cemented sandstone, and becomes finer grained upward. The base of the Maraghan is not exposed in the study area. The lowest exposed unit, lithofacies A, is dominated by coarse-, medium-, and fine-grained sandstone and lesser amounts of siltstone, shale, and interbedded limestone and dolomite. Beds in lithofacies A form fining-upward sequences that decrease in maximum grain size upward. Lithofacies B, which gradationally overlies lithofacies A, is dominantly a fine-grained sequence that is characterized by siltstone and shale, with lesser amounts of fine-grained sandstone. Beds of limestone and dolomite are rare; some zones of medium-grained sandstone occur locally. Lithofacies C overlies lithofacies B with a gradational contact and shows a west-to-east facies change. In the western part of the area, lithofacies C is fine-grained sandstone, siltstone, and shale, containing locally thick zones of brecciated limestone and dolomite; a pinkish tan dolomite is at the base, and a thick gray dolomite pod at Jabal Rahail forms a local carbonate unit that may have been tectonically thickened. In the eastern part of the area, sandstones are coarse-and medium-grained; fining-upward cycles prevail, and carbonate occurs as thin, lenticular beds at the base of cyclic beds. Locally, sections as thick as 10 m are dominated by coarse-or medium-grained sandstone. Lithofacies C appears to thicken toward the east. Lithofacies D, which gradationally overlies lithofacies C, is composed mainly of medium-and fine-grained sandstone, siltstone, and shale. Carbonate-bearing beds are rare, although carbonate pods along the bounding thrust fault in the northwest part of the basin may be part of lithofacies D. Fining upward cycles dominate clastic rocks. In western exposures siltstone and shale are dominant, but in eastern exposures medium-and fine-grained sandstone are more common. Lithofacies E, the uppermost of the facies units mapped, is composed mainly of graded sequences of coarse-and medium-grained sandstone, fine-grained sandstone, siltstone, and shale. Limestone and dolomite occur as cement in sandstone beds or as lenticular concretions.

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Geology of the Precambrian rocks of the Jabal Habashi Quadrangle, sheet 26F, Kingdom of Saudi Arabia

Cited by 3 publications

References 8 publications

Reconnaissance geology of the Al Abanat Quadrangle, sheet 25/42 B, Kingdom of Saudi Arabia

Reconnaissance geology of the Al Abanat Quadrangle, sheet 25/42 B, Kingdom of Saudi Arabia

Stratigraphy of the late Proterozoic Murdama Group, Saudi Arabia

Lithofacies and depositional environment of the Maraghan Formation, and speculation on the origin of gold in ancient mines, An Najady area, Kingdom of Saudi Arabia

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