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- W2738730778 endingPage "263" @default.
- W2738730778 startingPage "248" @default.
- W2738730778 abstract "The igneous rocks of the Wadi Hamad area are exposed in the northernmost segment of the Arabian–Nubian Shield (ANS). These rocks represent part of crustal section of Neoproterozoic continental island arc which is intruded by late to post-collisional alkali feldspar granites. The subduction-related intrusives comprise earlier gabbro–diorites and later granodiorites–granites. Subduction setting of these intrusives is indicated by medium- to high-K calc-alkaline affinity, Ta–Nb troughs on the spider diagrams and pyroxene and biotite compositions similar to those crystallized from arc magmas. The collisional alkali feldspar granites have high-K highly fractionated calc-alkaline nature and their spider diagrams almost devoid of Ta–Nb troughs. The earlier subduction gabbro–diorites have lower alkalis, LREE, Nb, Zr and Hf values compared with the later subduction granodiorites–granites, which display more LILE-enriched spider diagrams with shallower Ta–Nb troughs, reflecting variation of magma composition with arc evolution. The later subduction granitoids were generated by lower degree of partial melting of mantle wedge and contain higher arc crustal component compared with the earlier subduction gabbro–diorites. The highly silicic alkali feldspar granites represent extensively evolved melts derived from partial melting of intermediate arc crustal sources during the collisional stage. Re-melting of arc crustal sources during the collisional stage results in geochemical differentiation of the continental arc crust and the silicic collisional plutonism drives the composition of its upper part towards that of mature continental crust." @default.
- W2738730778 created "2017-07-31" @default.
- W2738730778 creator A5029662136 @default.
- W2738730778 creator A5059460438 @default.
- W2738730778 creator A5068449431 @default.
- W2738730778 creator A5073524235 @default.
- W2738730778 creator A5078243451 @default.
- W2738730778 date "2017-09-01" @default.
- W2738730778 modified "2023-10-16" @default.
- W2738730778 title "Intrusive rocks of the Wadi Hamad Area, North Eastern Desert, Egypt: Change of magma composition with maturity of Neoproterozoic continental island arc and the role of collisional plutonism in the differentiation of arc crust" @default.
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