Genesis of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia

Dawood, Yehia H.; Harbi, Hussein M.; El‐Naby, Hamdy H. Abd

doi:10.1016/j.jseaes.2009.05.007

Cited by 17 publications

(10 citation statements)

References 45 publications

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“…Moreover, numerous rocks comprise both pegmatitic and aplitic features in various combinations, the paragenetic relationships of which suggest the evolution within what may have amounted to single systems. For example, the mineralized aplite-pegmatite system of Jabal Sayid in the Hijaz region, Kingdom of Saudi Arabia, has been attributed to common descent (Dawood, 2010). Similar petrogenetic attributes had earlier been established for the late Proterozoic Elat-Quarry granite-pegmatite-aplite of southern Israel (Bogoch et al, 1997).…”

Section: Introductionmentioning

confidence: 83%

Contrasting petrogenetic attributes of associated pegmatitesaplites in Iwo Area, Southwestern Nigeria

Adetunji¹,

Olarewaju²,

Ocan³

2018

Ife Journal of Science

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Field, petrographical and geochemical data were used to constrain the petrogenetic attributes of the associated pegmatites and aplites in Iwo area, southwestern Nigeria. The pegmatites and aplites, which occur as veins and dykes are hosted by the 642 ± 6 Ma quartz potassic syenite. The pegmatites consist of quartz, feldspar with rare biotite and occasional beryl while in addition the aplites contain hornblende instead of biotite and totally lack beryl. Field evidences indicate that the pegmatites are older than the aplites. The two rock varieties show contrasting petrogenetic attributes in their chemical signatures. This is shown by the lack of any correlation or lines of descent in Harker's diagram, non-similarity of the K/Rb and Nb/Ta ratios and the contrasting patterns displayed by some elements in the mantle normalized diagrams (spidergrams) for the associated pegmatites and aplites. The elemental ratios do not support any rare element mineralization potentials for the two rock varieties. The two rock varieties lack significant tetrad effects which indicate crystallization from less evolved magma. This corroborates the negligible Eu (europium) anomalies for the two rocks (pegmatite: Eu/Eu*= 1.02, aplite: Eu/Eu*= 1.09). The parental magmas of these rocks though less evolved, displayed contrasting geochemical attributes which indicate different origins. This observation contrasts the general view that associated pegmatite-aplite have a common magma source.

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Section: Introductionmentioning

confidence: 83%

Contrasting petrogenetic attributes of associated pegmatitesaplites in Iwo Area, Southwestern Nigeria

Adetunji¹,

Olarewaju²,

Ocan³

2018

Ife Journal of Science

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“…The uranium mobility was attenuated due to absorption by iron oxides and clay minerals in the same rock. This is supported by the occurrence of uranyl minerals associated with goethite and argillic alteration products in the interstitial fractures adjacent to the small pegmatite and quartz veins (Dawood et al ., 2010). Chemical index of alteration (CIA), chemical index of weathering (CIW), and plagioclase index of alteration (PIA) showed low weathering rates for the different rocks of the study area and reflecting the limited role of weathering processes in the mobility of the elements in these rocks.…”

Section: Discussionmentioning

confidence: 99%

Significance of radioelements distribution in the Precambrian rocks of Jabel Sayid, western Saudi Arabia, using spectrometric and geochemical data

et al. 2020

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In situ gamma‐ray spectrometry measurements were carried out using RS‐230 BGO spectrometer over an area of 9.4 km2. One hundred and seventy eight spectrometric points were collected along parallel profiles with spacing 325 m in the Easting X direction and Northing Y direction. The results are treated statistically to determine the minimum, maximum, arithmetic mean (X), SD (S), and coefficient of variability (CV %). The spectrometric survey revealed the presence of radioactive zones in the aplite‐pegmatite with maximum eU content of 1,550 ppm and eTh of 7,974 ppm, whereas alkali granite has an average eU content of 12 ppm and eTh of 34 ppm. Felsite has an average eU and eTh close to that of alkali granite, 11 and 32 ppm, respectively. Pegmatite veins cutting alkali granite have high values of eU and eTh, an average of 34 and 101 ppm, respectively. The metamorphosed volcanic rocks of the Mahd Group demonstrate the lowest radioactivity with an average eU content of 0.8 ppm and eTh of 1.6 ppm. These rocks partly show evidences of post‐magmatic alteration processes, for example, silicification, sericitization, and oxidation. Excluding metavolcanics, the strong positive correlation between eU and eTh for the different rock varieties reflects their geochemical coherence during magma crystallization and indicates that both elements are largely accommodated into accessory minerals and were not disturbed by alteration. The CV values of the different rock units show normal distribution, where all the percentages of CV values are less than 100, with the exception of eU of felsite that shows CV % value slightly higher than 100. The aplite‐pegmatite, alkali granite, and the associated pegmatite veins show negative value of uranium outward migration, but are still the most favorable host rocks for uranium and thorium mineralization. A tentative interpretation of such contradiction suggests that uranium is largely accommodated into accessory minerals and only limited labile uranium redistribution has occurred and uranium was precipitated in association with alteration products. This interpretation is supported by the presence of kasolite Pb(UO2)SiO4.(H2O), along the fractured zones and quartz veins in the aplite‐pegmatite. The limited uranium migration in the study area was also revealed by the low weathering rate estimated by the calculations of chemical indices of alteration.

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“…3c and d) and the associated paleo arc suture zones [23] became loci of hydrothermal mineral deposits [6,[27][28][29]13]. Besides the heavy metals and transitional metals, the hydrothermal deposits associated with Najd fault systems and paleo suture zones include kasolite (uranyle mineral), uranium rich thorite, uraniferous fluoride-complexes and pyrochlore [30]. These minerals in the granites and associated pegmatites gave rise to high temperature geothermal systems along the western Arabian shield.…”

Section: Post Tectonic Plutonismmentioning

confidence: 99%

“…7) is about 161,467 km 2 [57]. As described in Section 4, uranium content in kasolite found in these granites is 46% (UO 3 , [58]) that makes the granite an economically important source for uranium. These granite generate high temperatures due to disintegration of radioactive elements and the heat generated by these granites is shown given in Table 2.…”

Section: High Heat Generating Granitesmentioning

confidence: 99%

CO2 mitigation strategy through geothermal energy, Saudi Arabia

Chandarasekharam

Lashin

Nassir

2014

Renewable and Sustainable Energy Reviews

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Genesis of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia

Cited by 17 publications

References 45 publications

Contrasting petrogenetic attributes of associated pegmatitesaplites in Iwo Area, Southwestern Nigeria

Contrasting petrogenetic attributes of associated pegmatitesaplites in Iwo Area, Southwestern Nigeria

Significance of radioelements distribution in the Precambrian rocks of Jabel Sayid, western Saudi Arabia, using spectrometric and geochemical data

CO2 mitigation strategy through geothermal energy, Saudi Arabia

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