Geochemistry and Petrogenesis of the Ediacaran Post-Collisional Granitoid Rocks in the Midyan Terrain, Northern Arabian Shield, Saudi Arabia

Midyan granites are located in the northern Arabian shield, northwest Saudi Arabia, terrain. They represent most northerly segment of Arabian–Nubian which comprises part East African orogeny. Consequently, understanding origin post-collisional and anorogenic magmatism terrain has significant geodynamic implications. mainly composed alkali feldspar granite, syenogranite, rarely granodiorite diorite. Most studied alkali-calcic, calc-alkaline, metaluminous to peraluminous magma types. characterized by enrichment with light rare earth elements (LREEs), large-ion lithophile (especially Rb Th), some high-field strength (HFSE, e.g., Nb, Ta, Zr, U), slight depletion heavy (HREEs). Therefore, Hael this paper good sources geothermal heat, uranium–thorium, REE mineralization. The have moderately strong negative Eu anomalies a distribution pattern that is very consistent upper crust, indicating presence plagioclase or potassium cumulates. Th/Ta ratio similar source may be derived from crust following collision between West Gondwana final stage Shield evolution. data presented study therefore intraplate occurred at beginning transition convergent extensional tectonics. melt generated crystallization temperature around 750°C pressure 0.2–0.5 GPa, emplaced relatively shallow moderate depths 20 30 km.