Early Pan-African evolution of the basement around Elat, Israel,and the Sinai Peninsula revealed by single-zircon evaporation dating, and implications for crustal accretion rates

Kröner, Alfred; Eyal, M.; Eyal, Yehuda

doi:10.1130/0091-7613(1990)018<0545:epaeot>2.3.co;2

Cited by 127 publications

(63 citation statements)

References 15 publications

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“…3a Two U-Pb dated rocks of the older tectono-magmatic phase, including the Taba and Aliat gneisses of 800-780 Ma (unpublished data referred to in Be'eri-Shlevin et al 2009b; Kröner et al 1990), are characterized by Sr i of 0.7029 and 0.7036 and eNd(T) of ?3.4 and ?3.6, respectively. The Sa'al meta-basalt and Kid schist have not been dated by U-Pb, but, as discussed earlier, these rock-units are parts of the older tectono-magmatic phase of the northernmost ANS.…”

Section: Whole-rock Sr-nd Isotope Resultsmentioning

confidence: 99%

“…1). Reported U-Pb ages for these rocks have consistently yielded ages within the range of 820-740 Ma (Be'eri-Shlevin et al 2009b;El-Shafei and Kusky 2003;Jarrar et al 2003;Kolodner et al 2006;Kröner et al 1990Kröner et al , 1994Stern and Manton 1987), whereas whole-rock (WR) and mineral Rb-Sr ages show a larger scatter and range down to 610 Ma (Bielski 1982;Halpern and Tristan 1981). Ductile deformation is recorded by all MC rocks, but the number of deformation events and their ages are still debated (Cosca et al 1999;El-Shafei and Kusky 2003;Eyal et al 1991;Fowler and Hassan 2008;Shimron 1984).…”

Section: Geology Of the Study Areamentioning

confidence: 99%

“…The U-Pb dated Aliat (*800 Ma; unpublished data reported in Be 'eri-Shlevin et al 2009b) and Taba (*780 Ma; Kröner et al 1990) gneisses of tonalite to granodiorite composition represent the Elat-and Feiran-MCs, respectively (Fig. 1).…”

Section: Sample Descriptionmentioning

confidence: 99%

“…A younger tectono-magmatic phase in this region includes the weakly to non-metamorphosed Feirani-Rutig volcano-sedimentary series and minor calc-alkaline deformed plutons of *675-640 Ma (CA1 suite; Eyal et al 1991;Jarrar et al 2003;Kröner et al 1990;Moussa et al 2008;Stern and Hedge 1985;Stern and Manton 1987).…”

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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Section: Whole-rock Sr-nd Isotope Resultsmentioning

confidence: 99%

Section: Geology Of the Study Areamentioning

confidence: 99%

Section: Sample Descriptionmentioning

confidence: 99%

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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“…3). Previous studies of the Wadi Fatira area (e.g., Sabet et al 1972;Ressetar and Monard 1983;Abu El-Leil and El Gammal 1991;Abu El-Leil et al 1991; Hashad 1980;Greenberg (1981); Stern and Hedge (1985); Beyth et al (1994); Moghazi et al (1998Moghazi et al ( , 1999 Hammamat group Sandstone, conglomerate, greywacke and volcaniclastics 600-585 Willis et al (1988) Dokhan volcanics Andesite and rhyolite flows and pyroclastics 620-550 Stern and Hedge (1985); Stern and Gotfried (1986);Segev (1987); Abdel Rahman and Doig (1987) Older granitoids Quartz diorite, tonalite, granodiorite, and tronhjemite 750-610 Hashad (1980); Dixon (1981); Stern and Hedge (1985); Moghazi (1999) Island arc assemblage Basalt, andesite, and rhyolite flows (YMV) and gabbro-diorite complexes associated with volcanogenic metasediments 820-620 Stern (1981); Stern and Hedge (1985); Kröner et al (1990) Ophiolitic group Serpentinites and talc carbonates, melange, deformed gabbro, and pillow lava (OMV) 810-730 Kröner et al (1992) Fig . 2 Map showing the distribution of the Dokhan volcanics in North Eastern Desert and the location of the study area (modified from the Geological map of Egypt 1981).…”

Section: Field Relations and Petrographymentioning

confidence: 97%

Geochemistry, petrogenesis and tectonic setting of late Neoproterozoic Dokhan-type volcanic rocks in the Fatira area, eastern Egypt

Mohamed¹,

Moghazi²,

Hassanen³

2000

International Journal of Earth Sciences

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The Neoproterozoic Dokhan volcanics of the Fatira area in eastern Egypt comprise two main rock suites: (a) an intermediate volcanic suite, consisting of basaltic andesite, andesite, dacite, and their associated pyroclastic rocks; and (b) a felsic volcanic suite composed of rhyolite and rhyolitic tuffs. The two suites display well-defined major and trace element trends and a continuum in composition with wide ranges in SiO 2 (54-76%), CaO (8.19-0.14%), MgO (6.96-0.04%), Sr (983-7 ppm), Zr (328-95 ppm), Cr (297-1 ppm), and Ni (72-1 ppm). They are enriched in LILEs (Rb, Ba, K, Th, Ce) relative to high field strength elements (Nb, Zr, P, Ti) and show strong affinity to calc-alkaline subduction-related rocks. However, their undeformed character, their emplacement temporally and spatially with post-orogenic A-type granite, and their high Zr/Y values suggest that their emplacement follow the cessation of subduction in eastern Egypt in an extensionalrelated within-plate setting. Major and trace element variations in the intermediate volcanics are consistent with their formation via partial melting of an enriched subcontinental lithospheric mantle source followed by a limited low-pressure fractional crystallization of olivine and pyroxene before emplacement. The LILE enrichment relative to HFSE is attributed to the inheritance of a subduction component from mantle material which constituted the mantle wedge during previous subduction events in eastern Egypt. The evolution of the whole volcanic spectrum was governed mainly by crystal/melt fractionation of amphibole, plagioclase, titanomagnetite, and apatite in the intermediate varieties and plagioclase, amphibole, biotite, Fe-Ti oxides, apatite, and zircon in the felsic varieties. At each stage of evolution, crystal fractionation was accompanied by variable degrees of crustal contamination.

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Hf Isotopes and Detrital Zircon Geochronology of the Silasia Formation, Midyan Terrane, Northwestern Arabian Shield: An Investigation of the Provenance History

Dessouky,

Ali,

Hassan

2024

Geological Journal

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U–Pb ages and Hf isotopic data from detrital zircon of the Silasia Formation in the Midyan Terrane record evidence for the provenance and tectonic evolution of the northern Arabian Shield. Given that the youngest acknowledged age of these detritus sediments is 735 ± 13 Ma, it is likely that the Silasia Formation was deposited during the closure of the Mozambique Ocean. The U–Pb ages define a major Mesoproterozoic peak, with two minor peaks of Neoproterozoic and Archean age. Combined with zircon Hf isotopic compositions, the sedimentary detritus of the Silasia Formation was mainly derived from source rocks formed during the Grenville Orogeny during the assembly of Rodinia, with a minor contribution from Archean and Paleoproterozoic crustal material, in addition to a limited arc‐basement supply related to the early Mozambique Ocean. The youngest Concordia age of 735 ± 13 Ma with highly variable εHf(t) values (11 to −35) indicates a complex mixture of sources from juvenile to extremely ancient. The Concordia ages at 1113 ± 11 and 1046 ± 10 Ma have positive hafnium isotope signatures (up to +10.45) that are consistent with juvenile source rocks formed during the Grenville Orogeny. Several detrital zircons with ages of 2622 ± 22 Ma and 2690 ± 7 Ma are similar to those reported in Yemen, whereas 1818 ± 19 Ma, 2071 ± 8 Ma and 2001 ± 19 Ma Paleoproterozoic ages are similar to dated outcrops in the Khida terrane in the eastern Arabian Shield.

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Early Pan-African evolution of the basement around Elat, Israel,and the Sinai Peninsula revealed by single-zircon evaporation dating, and implications for crustal accretion rates

Cited by 127 publications

References 15 publications

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

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

Geochemistry, petrogenesis and tectonic setting of late Neoproterozoic Dokhan-type volcanic rocks in the Fatira area, eastern Egypt

Hf Isotopes and Detrital Zircon Geochronology of the Silasia Formation, Midyan Terrane, Northwestern Arabian Shield: An Investigation of the Provenance History

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