The Almogholagh Intrusive Complex (AIC) was emplaced between 141 and 146 Ma during the Late Jurassic-Early Cretaceous, which is the same as the crystallization ages of the other intrusive rocks in the C-SaSZ. This suggests these sequentially injected magmas were from an enriched mantle from a spinel lherzolite that contaminated to forming the granitic rocks.It seems, extension of the continental lithosphere associated with mantle plume of the continental rift structures, caused injection of mantle-derived magmas into the continental crust. Heat transfer and volatile percolation from the basic magma into the lower continental crust, led to partial melting and contaminating these magmas with crust and (or) supracrustal rocks, causing the formation of acidic magma. Contamination by sialic crust and sediment can impart subduction-like signature for C-SaSZ.
