Neoproterozoic dyke swarms from southern Sinai (Egypt): geochemistry and petrogenetic aspects

Structural Controls on Groundwater Flow in Basement Terrains: Geophysical, Remote Sensing, and Field Investigations in Sinai

“…The criteria used for the identification of mafic and felsic dikes in the field and from satellite imagery are: (1) subparallel, compositionally homogenous, linear features of large areal extent (hundreds of meters) and limited width (meters) that cut across rock units and sediments of variable compositions, (2) mafic dikes rich in Fe-bearing aluminosilicates (pyroxene) and opaque phases (magnetite, ilmenite) and poor in hydroxyl-bearing phases (Iacumin et al 1998;El-Sayed 2003) appear in shades of blue on the band ratio color composite and as dark streaks on the Google Earth images, while felsic dikes, which are poor in Fe-bearing aluminosilicates, opaque phases, and hydroxyl-bearing phases (Iacumin et al 1998;El-Sayed 2003) appear in shades of green (fresh), and brown (slightly altered) on the ratio images (Sultan et al 1987) and as bright buff linear features areas on the Google Earth images.…”

“…The basement complex of southern Sinai is dissected by numerous vertical to subvertical dike swarms (length 0.1-15 km; width 0.5-20 m) of mafic, intermediate, and felsic compositions Iacumin et al 1998). Dike swarms in the study area are classified into three main groups based on their age of emplacement: (1) metamorphosed syn-tectonic dikes (age 800-650 Ma; Eyal and Eyal 1987); (2) widely distributed, unmetamorphosed, post-orogenic dikes (591-459 Ma) of extensional, late Pan-African origin (Stern et al 1984Iacumin et al 1998); and (3) Neogene dikes (30-12 Ma) related to the extensional forces associated with the Red Sea Rift system (Meneisy 1990).…”

“…Dike swarms in the study area are classified into three main groups based on their age of emplacement: (1) metamorphosed syn-tectonic dikes (age 800-650 Ma; Eyal and Eyal 1987); (2) widely distributed, unmetamorphosed, post-orogenic dikes (591-459 Ma) of extensional, late Pan-African origin (Stern et al 1984Iacumin et al 1998); and (3) Neogene dikes (30-12 Ma) related to the extensional forces associated with the Red Sea Rift system (Meneisy 1990). The first two groups are mafic, intermediate, and felsic in composition, whereas the Neogene dikes have basaltic compositions (El-Sayed 2003).…”

Geochemistry, geochronology, and Sr–Nd isotopes of the Late Neoproterozoic Wadi Kid volcano-sedimentary rocks, Southern Sinai, Egypt: Implications for tectonic setting and crustal evolution

“…El-Bialy, 2010;Eyal et al, 2010;Friz-Topfer, 1991;Iacumin et al, 1998;Kessel et al, 1998;Moghazi, 2003) or from melting of subducted oceanic crust (e.g., Bogoch et al, 2003;Eliwa et al, 2006;Katz et al, 2004). However, Be'eri- Shlevin et al (2009aShlevin et al ( , b, 2011 pointed out that continental collision in the northernmost ANS likely involved few fragments of oceanic crust during its late stages (ca.…”

Late Neoproterozoic volcano-sedimentary successions of Wadi Rufaiyil, southern Sinai, Egypt: A case of transition from late- to post-collisional magmatism

“…However, in late to post-collisional environments these features may simply represent derivation of magmas from a lithospheric mantle which has been previously metasomized by earlier subduction related processes. This has been suggested by many works for the late Neoproterozoic magmatism in the northern ANS (Stern and Gottfried, 1986;Friz-Töpfer, 1991;Iacumin et al, 1998;Kessel et al, 1998;Essawy and El-Metwally, 1999;Moghazi, 2003).…”