Geo chem i cal and fractal anal y sis of en claves in the Dehe-Bala in tru sion, (North west ern Iran): a new con cept in the in ter pre ta tion of the crust-man tle in ter ac tion pro cess Gharamohammadi, Z., Kananian, A., Eliassi, M., 2019. Geo chem i cal and fractal anal y sis of en claves in the Dehe-Bala in trusion, (North west ern Iran): a new con cept in the in ter pre ta tion of the crust-man tle in ter ac tion pro cess. Geo log i cal Quar terly, 63 (3): 505-521, doi: 10.7306/gq.1481 As so ci ate ed i tor: Wojciech Granoszewski The Dehe-Bala in tru sion is one of the re mark able in tru sions of granodiorite rocks with I-type af fin ity and abun dant mafic microgranular en claves (MMEs) in the Buin Zahra area, Qazvin, Iran. The MMEs, com posed of diorite and quartz-monzodiorites, are hap haz ardly wide spread in the granodiorites. The Dehe-Bala Granodiorites (DBG) usu ally are char ac ter ized by high con tents of SiO 2 (64.2-66.9), Na 2 O (3-3.23), K 2 O (3.49-4), Mg# 4.84 and Th/Ta ra tio (»7.9). In compar i son to the DBG, the MMEs can be dis tin guished by their lower value of SiO 2 (52.8-58.2), K 2 O (1.4-3.8) and higher Mg# (0.4-0.46). All these char ac ter is tics show a dif fer ent com po si tion of the DBG and MMEs, more im por tantly, can ar gue in favor of a magma mix ing/min gling or i gin in the DBG. The en rich ment in to tal REEs and HFSEs in the MMEs clearly re flects a marked diffusional pro cess from the fel sic to mafic magma that could have been achieved by chem i cal ex change dur ing the magma mix ing/min gling pro cess. The fractal di men sions (D box ) of MMEs dif fer from 1.14 to 1.29 with the high est fre quency at 1.29. The tex tural het er o ge ne ity and geo chem i cal fea tures com bined with high D box val ues in the MMEs com pared with the DBG show lower de grees of mix ing/min gling be tween man tle-de rived mafic and lower crust-de rived fel sic mag mas.Fig . 1A -sim pli fied map of tec tonic zones of the Zagros Orogenic Belt, Urumieh-Dokhtar Mag matic As sem blage (UDMA), Sanandaj-Sirjan Zone (SSZ), Zagros Fault Thrust Belt (ZFTB); B -sim pli fied geo log i cal map of the DBG in south -west Buin Zahra (af ter Eghlimi, 2000)