Abstract: Ion-probe U–Pb dating of plutonic rocks from the northern Arabian–Nubian Shield in Sinai and southern Israel constrains timing late East African batholithic post-collisional calc-alkaline (CA2) magmatism within-plate alkaline to peralkaline (AL) c . 635–590 Ma 608–580 Ma, respectively. The earliest dated CA2 are slightly deformed undeformed, indicating that penetrative deformation ceased by 630 Ma. Within suite a change mafic felsic is manifested most region, peaking voluminous...

Multi-isotope study including whole-rock Nd–Sr, single zircon Hf, and SIMS δ18O analyses of zircons sheds light on magma sources in the northernmost Arabian–Nubian Shield (ANS) during ~820–570 Ma. Reconnaissance initial Nd Sr isotope data for older rocks (~820–740 Ma) reaffirms previous estimates that early crustal evolution this part shield involved some contamination by pre-ANS material. Prominent provinciality is displayed post-collisional calc-alkaline alkaline igneous ~635–570 Ma across...

Research Article| October 01, 2009 Contribution of pre Pan-African crust to formation the Arabian Nubian Shield: New secondary ionization mass spectrometry U-Pb and O studies zircon Yaron Be'eri-Shlevin; Be'eri-Shlevin * 1Department Geological Environmental Sciences, Ben-Gurion University, Beer-Sheva, Israel 2Laboratory for Isotope Geology, Swedish Museum Natural History, Stockholm, Sweden *E-mail: yaron.beeri@nrm.se. Search other works by this author on: GSW Google Scholar Katzir; Katzir...

Abstract The six exposures of the Upper tectonic Unit Cycladic Massif occurring on island Tinos are shown to comprise a metamorphosed dismembered ophiolite complex. common stratigraphic section consisting tens-of-metres- thick slices mafic phyllites overlain by serpentinites and gabbros is considered have been derived combination thrusting during obduction subsequent attenuation low-angle normal faults. All rock types show evidence phase regional greenschist-facies metamorphism, which in...

Basic and ultrabasic blocks within ophiolitic mélanges of the Cycladic Blueschist Unit in southern Evia provide a detailed insight into its ocean floor igneous hydrothermal evolution, as well regional poly‐metamorphism occurring during Alpine orogenesis. The upper structural levels (Mt. Ochi exposures) are dominated by metamorphosed wehrlites, gabbros highly light rare earth element (LREE)‐enriched pillow basalts, whereas underlying Tsaki mélange consists basic protoliths with much less...

Abstract The timing and mode of uplift the Troodos ophiolite are constrained by low‐temperature thermochronology combined with geomorphic analysis. Zircon (U‐Th)/He apatite fission track cooling ages in plutonic sequence all Cretaceous (83–106 Ma) within error published zircon U‐Pb crystallization ages. This indicates early oceanic crust termination spreading axis magmatism at ~90 Ma. Apatite decrease reconstructed crustal depths from ~40 Ma near top sheeted‐dike complex to ~4 mantle...

Abstract U–Pb ages, trace element content and oxygen isotope ratios of single zircons from five plagiogranite intrusions the Troodos ophiolite were measured to determine their crystallization age assess importance fractional versus crustal anatexis in petrogenesis. The results indicate that oceanic magmatism took place at 94·3 ± 0·5 Ma, about 3 Myr earlier than previously recognized. Later hydrothermal alteration has affected most plagiogranitic rocks, resulting growth new zircon and/or...

Abstract Collision‐related granitoid batholiths, like those of the Hercynian and Himalayan orogens, are mostly fed by magma derived from metasedimentary sources. However, in late Neoproterozoic calcalkaline (CA) batholiths Arabian–Nubian Shield ( ANS ), which constitutes northern half East African orogen, any sedimentary contribution is obscured juvenile character crust scarcity migmatites. Here, we use paired situ LASS ‐ ICP MS measurements U–Th–Pb isotope ratios REE contents monazite...

Meta‐peridotites outcropping at different structural levels within the Alpine metamorphic complex of Cycladic island Naxos were studied to re‐examine their evolution and possible tectonic mechanisms for emplacement mantle material into continental crust. The margin section exposed on Naxos, consisting pre‐Alpine basement c. 7 km thick Mesozoic platform cover, has undergone intense metamorphism age, comprising an Eocene (M1) blueschist event strongly overprinted by a Miocene Barrovian‐type...

Abstract The Alpine orogen in the Cyclades, wherein both high-pressure metamorphic rocks and ultramafic co-occur, is a key area studying emplacement of mantle into crust. Within Cyclades three distinct associations occur: (1) HP–LT ophiolitic mélanges Cycladic Blueschist Unit (CBU) on Evia Syros; (2) meta-peridotites associated with migmatized leucogneisses Naxos, which represent deepest exposed levels CBU; (3) greenschist-facies metamorphosed dismembered ophiolite juxtaposed top CBU by an...

The Variscan orogenesis in Europe peaked during the Late Devonian–Early Carboniferous times when Gondwanan terranes collided with Laurasia. Hitherto it has been thought that tectonics northern Arabia and adjacent parts of NE Africa were broad swells ('arches') depressions ('basins') formed as a far-field contractional effect compression. discovery 351 ± 3 Ma (U–Pb zircon) within-plate felsic volcanism Helez borehole, southern coastal Israel, suggests Levant Arch is, instead, extensional...

Katzir, Y., Litvinovsky, B., Eyal, M., Zanvilevich, A., and Vapnik, Y. 2006. Four successive episodes of Late Pan-African dikes in the central Elat area, southern Israel.lsr. J. Earth Sci. 55: 69-93. dike suites are recognized area: (I) microdiorite lamprophyre; (2) dacite porphyry with subordinate andesite fcldspathic (Fsp) rhyolite porphyry; (3) quartz Fsp-rhyolite minor trachydolerite trachyandesite; (4) trachydolerite, mostly high-Ti. Dike swarms formed over period -600 Ma to 530 Ma. The...