0000000000147509
AUTHOR
Kamal A. Ali
U–Pb zircon geochronology and Hf–Nd isotopic systematics of Wadi Beitan granitoid gneisses, South Eastern Desert, Egypt
Abstract Migmatitic granitoid gneisses are widespread in the southern Eastern Desert of Egypt, but their formation ages are poorly understood. They consist of granitoid gneiss ranging in composition from tonalite to granodiorite, with a distinct calc-alkaline chemical character. Zircons from three migmatitic gneiss samples from Wadi Beitan were dated on SHRIMP II and yielded magmatic emplacement ages of 719 ± 10, 725 ± 9 and 744 ± 10 Ma, respectively, indicating that the gneiss protoliths are Neoproterozoic. The zircons yielded eHf(t) values of − 4.8 to + 12.5 and corresponding Hf crustal model ages ranging from 824 to 1753 Ma. These data indicate the involvement of both juvenile and older …
Short note of field workshop on Neoproterozoic ophiolites, ophiolitic mélanges and other rock units in the Eastern Desert of Egypt and comparison with the Central Asian Orogenic Belt of Central Asia (18–24 February 2016)
The Neoproterozoic Arabian–Nubian Shield (ANS) and the latest Mesoproterozoic to late Palaeozoic Central Asian Orogenic Belt (CAOB) are two large and long-lived accretionary orogens. Both are mostl...