Subduction-related Wadi Dabr metagabbro-diorite complex, intrusive gabbros and the enclosed opaques, Central Eastern Desert, Egypt.

            The Dabr metagabbro-quartz diorite intrusion (DMQD), commonly described as metagabbro-diorite complex, occurring along Wadi Dabr,  forms an elongated mass intruded into the metavolcanics and  associated  pyroclastics. It is intruded by younger gabbro (Ygb) and younger  granites.  The DMQD comprises  metagabbro, diorites , quartz diorite and appinites..

            Variation diagrams of the DMQD suggest  fractional crystallization by separation of pyroxene followed by plagioclase and hornblende. Moreover, a compositional gap exists between the DMQD and the Ygb, frequently described as gabbro relics.The spiderdiagram was constructed which displays that the DMQD is enriched in large ion lithophile (LIL) elements and depleted in incompatible (HFS) elements, a feature characteristic of all subduction-related magmas.

            The DMQD is calc-alkaline, subduction related magmatism and was  formed by fractional crystallization of high-alumina basaltic  magma and probably represent the forerunner of G1 granites. The  YGb is tholeiitic and formed from basaltic magma in the active continental margin..

            Ore microscopic investigation reaveled that the opaque oxides previail in the DMQD while sulphides are quite abundant in the Younger gabbro (YGb).