Post-Orogenic Peralkaline and Calc-Alkaline Granites and Associated Mineralization of the Arabian Shield, Kingdom of Saudi Arabia

Stoeser, Douglas B.; Elliott, James E.

doi:10.1016/b978-0-08-024481-5.50006-6

Cited by 51 publications

(56 citation statements)

References 18 publications

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“…Much of this granitic rock is alkalic and has a peralkalic or peraluminous composition. It was most abundantly intruded in the northernmost part of the shield, as at Jabal Aja' and Jabal Salma, and in a zone about 100 km wide to the west of the Hulayfah-Ad Dafinah-N abitah-Hamdah serpentinite belt (Stoeser and Elliott, 1980), where prior tectonic thickening of the crust during the culminant orogeny may have been particularly significant. In contrast, only small volumes of alkalic granite are found dispersed elsewhere across the shield.…”

Section: Late Crustal History Culmi Nant Orogen Y a Nd Posttecto N I mentioning

confidence: 99%

“…The depth of erosion A36 GEOLOGY OF THE ARABIAN PENINSULA is shallower in the northeastern part of the shield than in other parts (Brown and Jackson, 1960). This is indicated by abundant exposures of the latest Proterozoic rhyolitic Shammar Group; in places, as at Jabal Aja', granitic intrusive rocks are still preserved in direct, subvolcanic contact with the Shammar volcanic rocks (Stoeser and Elliott, 1980). In the central part of the shield, in a belt about 200 km wide and including the major N ajd fault zones, late orogeny was intense and the erosion level is moderately shallow in that many late granitic plutons are exposed with few cogenetic rhyolitic rocks of the Shammar Group.…”

Section: Precambrian Plutonic Rocks Of the Arabian Shieldmentioning

confidence: 99%

“…The rocks of the granitic suite are exposed throughout the Precambrian shield and are most abundant in the northeastern half of the shield. Alkalifeldspar granite and peralkalic granite have not been found in the southwestern part of the shield (Stoeser and Elliott, 1980); however, several plutons of syenite and shonkinite intrude this part of the shield. Most of these rocks were emplaced during cratonization after about 675 m.y.…”

Section: Dioritic Suitementioning

confidence: 99%

“…16) are representative of a broad belt of peralkalic granite plutons that parallels the HulayfahAd Dafinah-N abitah-Hamdah serpentinite-bearing fault zone. Many of the alkalic and peralkalic granite plutons of the shield (Stoeser and Elliott, 1980) are associated with this zone of tectonic ophiolite (Frisch and AlShanti, 1977;Delfour, 1979b;Schmidt and others, 1979).…”

Section: Tj-trondhjemitementioning

confidence: 99%

“…The widespread, but overall smallvolume, ophiolitic rocks (Delfour, 1979b, N uqrah quadrangle, area 1) are entirely tholeiitic. A few of the latest Precambrian rocks of the shield, rocks of Shammar age and N ajd age, are alkalic and peralkalic (Stoeser and Elliott, 1980).…”

Section: Tholeiitic Calc-alkalic and Alkalic Compositions General Smentioning

confidence: 99%

See 4 more Smart Citations

Geology of the Arabian Peninsula; shield area of western Saudi Arabia

Brown¹,

Schmidt²,

Huffman³

1989

Professional Paper

107

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Section: Late Crustal History Culmi Nant Orogen Y a Nd Posttecto N I mentioning

confidence: 99%

Section: Precambrian Plutonic Rocks Of the Arabian Shieldmentioning

confidence: 99%

Section: Dioritic Suitementioning

confidence: 99%

Section: Tj-trondhjemitementioning

confidence: 99%

Section: Tholeiitic Calc-alkalic and Alkalic Compositions General Smentioning

confidence: 99%

See 3 more Smart Citations

Geology of the Arabian Peninsula; shield area of western Saudi Arabia

Brown¹,

Schmidt²,

Huffman³

1989

Professional Paper

107

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African anorogenic alkaline magmatism and mineralization — a discussion with reference to the Niger-Nigerian Province

Kinnaird¹,

Bowden²

1987

Geol. J.

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Thc close of the Pan-African was characterized by a change from subduction and arc related magmatism to post tectonic alkaline magmatism in Saudi Arabia and West Africa. For the remainder ol the Phanerozoic, folding and tectonism was more restricted in Africa than on any other continent and was limited to the Caledonian, Hercynian and Alpine orogenies in the extreme north, and the Cape fold belt at the southern tip of the continent, with an equivalent orogenic belt on the extreme east of the Arabian peninsula. Thus Phanerozoic magmatism was dominantly anorogenic in nature and alkaline in character throughout the African Plate. Such magmatism was initiated by reactivation of deepseated lineaments with thc peak of activity during the Mesozoic, which can be correlated with fragmentation of Gondwanaland. The Phanerozoic alkaline magmatism is characterised by small centres of auhvolanic t o plutonic nature often in the form of ring complexes. These can be subdivided into two separate associations consisting of Provinces dominated by centres of ovcrsaturated magmatism such as Nigeria and Sudan. Thcre are also provinces with undersaturated complexes and carhonatites with oversaturated magmatism such as in Namibia. Angola, and the East African rift system. Despite the contrasting nature of undersaturated and oversaturated magmatism many comparisons can bc drawn between carbonatites and granitic complexcs. Such comparisons include thc source of the magmas, the mechanisms of emplacement, the cause and effect of alkali metasomatism and processes of hydrothermal alteration, the trace element geochemistry, the abundance of zircon, uranium. thorium and complex Ti-Zr silicates, the importance o f columbite, pyrochiore, fluorine, and rare earth enrichment in mineralization, and in their current and future economic potential. The common feature is the devclopment and reactivation of deep-seated lineaments which were not only controlled the ernplacement of anorogenic complexes but also acted as channelways for hydrothcrmal mineralizing fluids. Thc development of a fluid phase during crystallisation occurred in both undersaturated and oversaturated alkaline rocks. Subsequent hydrothermal modifications, subsolidus reactions. geochemical variations and mineralization were dependent upon whether this fluid phase was retained or expelled.

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Origin of the Volcanic-Arc Signature in Late-Orogenic Granitoids from the Arabian–Nubian Shield

Zoheir

Diab

2021

The Geology of the Arabian-Nubian Shield

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Post-Orogenic Peralkaline and Calc-Alkaline Granites and Associated Mineralization of the Arabian Shield, Kingdom of Saudi Arabia

Cited by 51 publications

References 18 publications

Geology of the Arabian Peninsula; shield area of western Saudi Arabia

Geology of the Arabian Peninsula; shield area of western Saudi Arabia

African anorogenic alkaline magmatism and mineralization — a discussion with reference to the Niger-Nigerian Province

Origin of the Volcanic-Arc Signature in Late-Orogenic Granitoids from the Arabian–Nubian Shield

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