Felsic plutonic rocks of the Midyan region, Kingdom of Saudi Arabia—I. Distribution, classification and resource potential

Ramsay, C. R.; Drysdall, Alan R.; Clark, Malcolm D.

doi:10.1016/s0899-5362(86)80068-9

Cited by 15 publications

(5 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These are interpreted as relictic signals from the last stages of the amalgamation of Gondwana, which were carried over by glaciogenic sediments. Jackson et al 1984;Stuckless et al 1985Stuckless et al , 1986Jackson and Douche 1986;Leo 1986;Ramsay et al 1986; and own samples), grey area represents Palaeozoic sediments from Tables Table 1. Palaeozoic sampling sites and outcrops with GPS coordinates Table 2. Modal composition and framework mineralogy for Palaeozoic sandstones.…”

Section: Discussionmentioning

confidence: 99%

“…In Fig. 5b, some typical basement rocks of the Arabian Shield (from Jackson et al 1984;Stuckless et al 1985Stuckless et al , 1986Jackson and Douche 1986;Leo 1986;Ramsay et al 1986;and own samples) (1993), the Zr/Sc ratios of Saudi Arabian Palaeozoic sandstones seem not only to be controlled by sedimentary processes but also have significant dependence on the source rocks as well.…”

Section: Sedimentary Recyclingmentioning

confidence: 97%

See 1 more Smart Citation

Petrography and geochemistry of Palaeozoic quartz-rich sandstones from Saudi Arabia: implications for provenance and chemostratigraphy

2016

View full text Add to dashboard Cite

The Arabian Peninsula hosts a thick Palaeozoic succession, ranging from the Cambrian through the Permian. It not only contains deposits of the two major Palaeozoic glaciations but also holds both the major Palaeozoic hydrocarbon source and reservoir rocks. In addition, Palaeozoic sandstones serve as important aquifers. The succession is dominated by highly mature quartz arenites, as seen in thin sections. It is starved of fossils and very uniform in lithology. In order to better understand provenance, tectonic setting and stratigraphic relationships, the petrography as well as major and trace element geochemistry of sandstones were studied. Samples were taken from two study areas in southern (Wajid area) as well as central and northern (Tabuk area) Saudi Arabia. The dataset we present here is the first comprehensive study to cover the entire Palaeozoic succession in both the southern and northern part of the Arabian Peninsula. The collisional signal from some samples is a relic from the last stages of the amalgamation of Gondwana, carried into the basin by glaciogenic sediments. Major and trace element geochemistry indicate the Neoproterozoic basement of the nearby Arabian Shield as the most likely source for the detritus. Tectonic discrimination diagrams suggest that deposition of sandstones took place in an intracratonic setting, which is in accordance with the established model for the evolution of the Arabian Plate. An influx of fresh material, probably sourced from the Shield, did occur in the late Palaeozoic units of the Wajid area but did not reach the Tabuk area. Geochemical methods have shown some success in characterising the provenance of both study areas but were unable to reliably assess sedimentary recycling. A (meta-)sedimentary source for the Palaeozoic sandstones could therefore neither be proven nor refuted. Multivariate cluster and principal component analysis of geochemical data revealed significant differences between the two study areas.2

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Sedimentary Recyclingmentioning

confidence: 97%

Petrography and geochemistry of Palaeozoic quartz-rich sandstones from Saudi Arabia: implications for provenance and chemostratigraphy

2016

View full text Add to dashboard Cite

show abstract

“…It constitutes about 2.3% of the plutonic rock assemblage in the Arabian Shield (Stoeser 1986). They form, along with the some aluminous granite, one of the economically important groups of granites in the shield and are associated with Nb, Ta, Th, U, Sn, W, F, Mo, Zr, Y and REE mineralization (Drysdall et al 1984;Ramsay et al 1986;Jackson 1986;Qadhi 1990). Forty-nine major and more than a dozen minor alkaline and peralkaline granite plutons are concentrated in the Midyan and Hijaz terrains and in the Nabitah orogenic belt.…”

Section: Introductionmentioning

confidence: 99%

Origin and hydrothermal alteration of rare-metal granites in the Al-Hamra area, northeastern Arabian Shield, Saudi Arabia

Qadhi

2007

Central European Geology

View full text Add to dashboard Cite

The Jabal Hamra (538 Ma) and Jabal Abu ad Dud plutons in northeast Saudi Arabia are epizonal bodies consisting of alkali feldspar granite and alkali feldspar syenite. Fracture-controlled zones of highly altered granites are recorded along the margins of the plutons. The granites intrude metamorphosed volcano-sedimentary successions of the Matran Formation. The rocks of the two plutons are chemically indistinguishable. They are characterized by above-average Th, Nb, Y, Ta, Hf and Zr, very low CaO, TiO 2 , MgO, FeO and MnO, and by high contents of rare earth elements (REE). Tectonic discrimination diagrams suggest an intra-plate environment, with many geochemical and mineralogical features resembling post-orogenic A-type granites. Numerous local and regional geologic constraints indicate that the plutons were intruded in an extension-related setting following the cessation of Neoproterozoic arc-related magmatism. Geochemical data are consistent with their derivation by partial melting of depleted crust followed by fractional crystallization of feldspars, ferromagnesian minerals and REE-rich accessory phases. The radiogenic isotope data [eNd (T) values are +3.5 to +4.2] indicate that the granite magma was generated from a 'juvenile' source, which is typical of the rocks making up most of the Arabian-Nubian Shield. Rare-metal mineralization is associated with the fracture-controlled alteration zones that occur at Jabal Al Hamra and Jabal Abu ad Dud. The altered rocks are characterized by higher TiO 2 , Fe 2 O 3 , SiO 2 and lower Al 2 O 3 , CaO, Na 2 O, than the unaltered rocks. They show high and wide range in the total REE contents (804-15579 ppm), , Nb (51-3483 ppm), Hf (13-368 ppm), Zr (394-14887 ppm), Th (16-572 ppm) and U (4-143 ppm). Field observations and further petrographic and chemical studies suggest that the altered rocks and the rare metal enrichment are the products of hydrothermal-metasomatic alteration of the quartz alkali feldspar syenite and the alkali feldspar granite. The rare-metal enrichment was explained by orthomagmatic fluid transport of these elements as fluoride complexes, and their subsequent deposition as a result of mixing with externally derived Fe-rich fluids.

show abstract

“…The most northerly located major structure related to Najd fault system is the Muwaylih fault zone (Ramsay et al 1985) in Al Muwaylih area. A continuation of this structure is probably concealed beneath the sands and gravels of the Ash Shaykh Humayd Peninsula in the southwestern corner of the Midyan region.…”

Section: Structural and Tectonic Historymentioning

confidence: 99%

Integrated Remote Sensing and Structural Analysis Studies of Tayyib Al-Ism Area, Northwestern Arabian Shield, Saudi Arabia

Kassem

Ghrefat

Zaman

et al. 2015

J Indian Soc Remote Sens

View full text Add to dashboard Cite

Geological and structural mappings of Tayyib AlIsm area were carried out using the rocks finite strain data, the Landsat-7 Enhanced Thematic Mapper Plus (ETM+) data and the field based observations. To analyze the finite strain in the studied rocks, the R f /ϕ and Fry methods are applied to feldspar porphyroclasts and mafic grains from nine metavolcanosedimentary samples (Hegaf Formation), four diorite-gabbros suite samples (Sawawin Complex), two meta-granite samples (Ifal suite) and five Zuhd alkali granite samples. The obtained data indicate traces of high to moderate level of deformation in the meta-granite and metavolcano-sedimentary rocks. The axial ratios along the XZ section range from 1.70 to 4.80 for the R f /ϕ method and from 1.50 to 4.50 for the Fry method. A subvertical trend of short axes in association with sub-horizontal foliation is also observed. These informations allow us to conclude that a finite strain in the deformed granitic rocks is of the same order of magnitude as in the metavolcano-sedimentary rocks. The contacts between the metavolcano-sedimentary and granitic rocks in Tayyib al Ism area were formed during the granitic intrusions along some of the faults under brittle to semi-ductile deformation conditions. These faults have significantly influenced the geometry and style of rifting in the Red Sea during the Neogene. The finite strain was accumulated in the area during the process of deformation, which superimpose the already existed nappe structure. It indicates that the nappe contacts formed during the accumulation of finite strain. In addition to finite strain analysis, band ratio images (3/1, 5/3, 7/5) and Principal Component Analysis (PCA) technique have been used, which proved effective in mapping geological and structural features of various rock bodies exposed in the study area.

show abstract

Felsic plutonic rocks of the Midyan region, Kingdom of Saudi Arabia—I. Distribution, classification and resource potential

Cited by 15 publications

References 22 publications

Petrography and geochemistry of Palaeozoic quartz-rich sandstones from Saudi Arabia: implications for provenance and chemostratigraphy

Petrography and geochemistry of Palaeozoic quartz-rich sandstones from Saudi Arabia: implications for provenance and chemostratigraphy

Origin and hydrothermal alteration of rare-metal granites in the Al-Hamra area, northeastern Arabian Shield, Saudi Arabia

Integrated Remote Sensing and Structural Analysis Studies of Tayyib Al-Ism Area, Northwestern Arabian Shield, Saudi Arabia

Contact Info

Product

Resources

About