They are rich in Rare Earth Elements (REE) and have extreme negative Eu anomalies (Eu/Eu*= 0.03–0.09). All compositions are highly evolved and display geochemical characteristics of post-collisional A-type granites: high SiO 2, Na 2O+K 2O, FeO*/MgO, Ga/Al, Zr, Nb, Ga and Y alongside low CaO, MgO, Ba and Sr. Zoned pegmatites occur as lenses of variable dimensions, featuring a quartz core, an intermediate zone rich in K-feldspars and an outer finer-grained zone rich in albite. Mineralogically, the massive pegmatites are divided into K-feldspar-rich and albite-rich groups. Massive pegmatites are the most common and form veins, dykes and masses of variable dimensions strikes range mainly from E-W through NW-SE to N-S. The pegmatites cross-cut host rocks in the Taba Metamorphic Complex (TMC) with sharp contacts and are divided into massive and zoned pegmatites.

We present new field, petrographical, mineralogical and geochemical data from late Neoproterozoic pegmatites and aplites in southern Sinai, Egypt, at the northernmost limit of the Arabian-Nubian Shield.

Veins of the earth character sheet