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  • 1
    Keywords: Physical geography. ; Geology. ; Geographic information systems. ; Earth System Sciences. ; Geology. ; Geographical Information System.
    Description / Table of Contents: 1. The Arabian-Nubian Shield, an introduction: historic overview, concepts, interpretations, and future issues -- 2. The boundary between the Saharan metacraton and the Arabian Nubian Shield: insight from Ediacaran shoshonitic granites of the Nuba Mountains (Sudan): U–Pb SHRIMP zircon dating, geochemistry and Sr-Nd isotope constraints -- 3. The Southern Part of the Arabian Nubian Shield in Kenya and Tanzania Harald Fritz and Christoph Hauzenberger -- 4. Tectonic Evolution of the Pan-African Belt in Western Ethiopia, Southern Arabian-Nubian Shield -- 5. Neoproterozoic Crustal Evolution of the northernmost Arabian-Nubian Shield, south Jordan.
    Abstract: ­This richly illustrated book reviews the geology, tectonics and mineralization of the Arabian-Nubian Shield (ANS) in 27 chapters. It starts with an examination of the ANS lithospheric scale features, explores Mesoproterozoic units and deals with the ANS oceanic stage. Arc volcanism and plutonism, post-collision basins and volcanics are discussed, as well as the younger granitoid magmatism and the deformation history of the ANS. The book provides information on ANS glacial stages and late magmatism. Chapters are devoted to review the transition between ANS and the reworked continent to its south. Finally, it discusses how ANS structures influenced the overall East African Rift System.
    Type of Medium: Online Resource
    Pages: XXIX, 771 p. 399 illus., 365 illus. in color. , online resource.
    Edition: 1st ed. 2021.
    ISBN: 9783030729950
    Series Statement: Regional Geology Reviews,
    DDC: 550
    Language: English
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  • 2
    ISSN: 0016-7835
    Keywords: Key words Arabian-Nubian shield ; Continental crust ; granites ; Sraisotopes ; Nd-isotopes ; Pb-isotopes ; U-Pb zircon ages
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Major and trace element data, U–Pb zircon ages, and initial isotopic compositions of Sr, Nd, and Pb are reported for ten granitic and one rhyolitic rock sample from the neo-Proterozoic Nakasib suture in NE Sudan. Chemical data indicate that the samples are medium- to high-K, "I-type" granitic rocks that mostly plot as "volcanic arc granites" on discriminant diagrams. Geochronologic data indicate that rifting occurred 790±2 Ma and constrain the time of deformation associated with suturing of the Gebeit and Haya terranes to have ended by approximately 740 Ma. Isotopic data show a limited range, with initial 87Sr/86Sr=0.7021 to 0.7032 (mean=0.7025), εNd(t) =+5.5 to +7.0 (mean=+6.4), and 206Pb/204Pb = 17.50–17.62. Neodymium model ages (TDM; 0.69–0.85 Ga; mean = 0.76 Ga) are indistinguishable from crystallization ages (0.79–0.71 Ga; mean=0.76 Ga), and the isotopic data considered together indicate derivation from homogeneously depleted mantle. The geochronologic data indicate that the terrane accretion to form the Arabian–Nubian shield began just prior to 750 Ma. The isotopic data reinforces models for the generation of large volumes of juvenile continental crust during neo-Proterozoic time, probably at intra-oceanic convergent margins. The data also indicate that crust formation was associated with two cycles of incompatible element enrichment in granitic rocks, with an earlier cycle beginning approximately 870 Ma and culminating approximately 740 Ma, and the second cycle beginning after pervasive high-degree melts – possibly hot-spot related – were emplaced approximately 690–720 Ma.
    Type of Medium: Electronic Resource
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