The Late Precambrian Timna igneous complex, Southern Israel: Evidence for comagmatic-type sanukitoid monzodiorite and alkali granite magma

Beyth, M.; Stern, Robert J.; Altherr, Rainer; Kröner, Alfred

doi:10.1016/0024-4937(94)90003-5

Cited by 220 publications

(138 citation statements)

References 60 publications

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“…Central European Geology 50, 2007 Table 2 Rb-Sr and Sm-Nd data for Al Hamra granites Similar models were suggested for other A-type granites of the Arabian-Nubian Shield (Beyth et al 1994;Moghazi 1999;Katzir et al 2006). The high initial Sr ratio (0.7068) may be attributed to addition of Sr from hydrothermal fluids.…”

Section: Origin and Hydrothermal Alteration Of Rare-metal Granites Insupporting

confidence: 60%

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

Qadhi

2007

Central European Geology

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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.

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Section: Origin and Hydrothermal Alteration Of Rare-metal Granites Insupporting

confidence: 60%

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

Qadhi

2007

Central European Geology

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“…Sr i and eNd(T) calculated for the Kid schist over the age range of 800-640 Ma vary from 0.6981 to 0.7028 and ?3.8 to ?2.6, respectively. eNd(T) values calculated for all rocks for the Figure 4 shows an eNd(T) versus age diagram, where results of the present study are plotted along with data from the literature (Azer et al 2009;Beyth et al 1994;Katzir et al 2007a, b;Moghazi et al 1998;Mushkin et al 2003;Stein and Goldstein 1996). The 820-740 Ma rocks of the northernmost ANS define a restricted eNd(T) field, which falls slightly below the DM evolution curve of DePaolo (1981).…”

Section: Whole-rock Sr-nd Isotope Resultsmentioning

confidence: 57%

“…4, inset). A clear outlier to the division outlined above is the eNd(T) of the Timna porphyritic granite from southern Israel (?5.6 to ?5.9; Beyth et al 1994;TPG in Fig. 4), which does not conform with the location of this rock in the NW-region of lower eNd(T) values.…”

Section: Whole-rock Sr-nd Isotope Resultsmentioning

confidence: 72%

“…A transition to alkaline magmatism (AL suite) in the northernmost ANS is associated with major features indicative of an extensional regime, such as uplift and intense erosion, and deposition of volcano-sedimentary units in closed basins at *600 Ma (Bentor 1985;Beyth et al 1994;Garfunkel 1999;Jarrar et al 2003;Stern 1994;Stern and Hedge 1985). Avigad and Gvirtzman (2009) argued that the *600 Ma uplift was due to lithospheric delamination.…”

Section: Geology Of the Study Areamentioning

confidence: 99%

“…Avigad and Gvirtzman (2009) argued that the *600 Ma uplift was due to lithospheric delamination. Nevertheless, older granites of this phase intruded prior to the formation of such basins at *608 Ma (Be 'eri-Shlevin et al 2009a;Beyth et al 1994) and magmatic activity lasted up to 580-570 Ma. Rocks of the AL suite include alkaline to peralkaline felsic (A-type granites) and rare mafic and intermediate plutons, as well as bimodal (mafic-felsic) alkaline and peralkaline volcanic rocks, and dike swarms (Bentor 1985;Beyth et al 1994;Garfunkel 1999;Katzir et al 2006Katzir et al , 2007aMoghazi et al 1998).…”

Section: Geology Of the Study Areamentioning

confidence: 99%

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Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

Be’eri-Shlevin

Katzir

Blichert‐Toft

et al. 2009

Contrib Mineral Petrol

101

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Multi-isotope study including whole-rock NdSr, single zircon Hf, and SIMS d 18 O analyses of zircons sheds light on magma sources in the northernmost Arabian-Nubian Shield (ANS) during *820-570 Ma. Reconnaissance initial Nd and Sr isotope data for the older rocks (*820-740 Ma) reaffirms previous estimates that early crustal evolution in this part of the shield involved some crustal contamination by pre-ANS material. Prominent isotope provinciality is displayed by post-collisional calc-alkaline and alkaline igneous rocks of *635-570 Ma across a NW-SE transect across basement of the Sinai Peninsula (Egypt) and southern Israel. Silicic rocks of the NW-region are characterized by lower eNd(T)-eHf(T) and higher Sr i and d 18 O compared with rocks of the SE-region, and the transition between the regions is gradual. Within each region isotope ratios are independent of the extent of magma fractionation, and zircon cores and rims yield similar d 18 O values. Comparison with southern segments of the ANS shows that the source for most *635-570 Ma rocks can be modeled as the isotopically aged lowerintermediate crust in the ANS core (SE-region) and its northern, more contaminated ANS margins (NW-region). Nevertheless, Nd-Sr isotope enrichment of the lithospheric mantle is indicated by some basic magmas of the NWregion displaying the most enriched Nd-Sr isotope compositions. Comparison of Nd and Hf depleted mantle model ages for rocks of the SE-region may indicate that crustal formation events in the ANS geographical core took place at 1.1-1.2 Ga and were followed by crustal differentiation starting at *0.9 Ga.

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Neoproterozoic calc‐alkaline peraluminous granitoids of the Deleihimmi pluton, Central Eastern Desert, Egypt: implications for transition from late‐ to post‐collisional tectonomagmatic evolution in the northern Arabian–Nubian Shield

et al. 2011

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The widely distributed late-collisional calc-alkaline granitoids in the northern Arabian-Nubian Shield (ANS) have a geodynamic interest as they represent significant addition of material into the ANS juvenile crust in a short time interval . The Deleihimmi granitoids in the Egyptian Central Eastern Desert are, therefore, particularly interesting since they form a multiphase pluton composed largely of latecollisional biotite granitoids enclosing granodiorite microgranular enclaves and intruded by leuco-and muscovite granites. Geochemically, different granitoid phases share some features and distinctly vary in others. They display slightly peraluminous (ASI ¼ 1-1.16), non-alkaline (calc-alkaline and highly fractionated calc-alkaline), I-type affinities. Both biotite granitoids and leucogranites show similar rare earth element (REE) patterns [(La/Lu) N ¼ 3.04-2.92 and 1.9-1.14; Eu/Eu Ã ¼ 0.26-0.19 and 0.11-0.08, respectively) and related most likely by closed system crystal fractionation of a common parent. On the other hand, the late phase muscovite granites have distinctive geochemical features typical of rare-metal granites. They are remarkably depleted in Sr and Ba (4-35 and 13-18 ppm, respectively), and enriched in Rb (381-473 ppm) and many rare metals. Moreover, their REE patterns show a tetrad effect (TE 1,3 ¼ 1.13 and 1.29) and pronounced negative Eu anomalies (Eu/Eu Ã ¼ 0.07 and 0.08), implying extensive open system fractionation via fluid-rock interaction during the magmatic stage. Origin of the calc-alkaline granitoids by high degree of partial melting of mafic lower crust with subsequent crystal fractionation is advocated. The broad distribution of late-collisional calc-alkaline granitoids in the northern ANS is related most likely to large areal and intensive lithospheric delamination subsequent to slab break-off and crustal/mantle thickening. Such delamination caused both crustal uplift and partial melting of the remaining mantle lithosphere in response to asthenospheric uprise. The melts produced underplate the lower crust to promote its melting. The presence of microgranular enclaves, resulting from mingling of mantle-derived mafic magma with felsic crustalderived liquid, favours this process. The derivation of the late-phase rare-metal granites by open system fractionation via fluid interaction is almost related to the onset of extension above the rising asthenosphere that results in mantle degassing during the switch to post-collisional stage. Consequently, the switch from late-to post-collisional stage of crustal evolution in the northern ANS could be potentially significant not only geodynamically but also economically.

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The Late Precambrian Timna igneous complex, Southern Israel: Evidence for comagmatic-type sanukitoid monzodiorite and alkali granite magma

Cited by 220 publications

References 60 publications

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

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

Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

Neoproterozoic calc‐alkaline peraluminous granitoids of the Deleihimmi pluton, Central Eastern Desert, Egypt: implications for transition from late‐ to post‐collisional tectonomagmatic evolution in the northern Arabian–Nubian Shield

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