Petrography of Gelmandeh Metamorphic Complex with Reference to Microscopic Deformation

Gelmandeh Massive is located north-east of Saghand, in Yazd province. From tectonics point of view it belongs to Central Iran, the Kalmard_Posht-e-Badam Block. The metamorphic complex comprises amphibolites, marble, schist, quartz- feldspatic gneisses. The amphibolites are of three types. Namly: Hornblendite (composed of more than 90% hornblende), Garnet amphibolites and amphibolitic gneiss. Deformations in Gelmandeh metamorphic complex are reflected in 6 types of rocks: 1-deformed igneous rocks, 2- mylonitic series rocks, 3-cataclastic series rocks, 4-regional metamorphic rocks, 5- mylonitic regional metamorphic, 6 cataclastic regional metamorphic rocks. Conspicuous deformational features comprise: tilted feldspars twining, erratic pertite, mirmecite, porphyroblasts, clasts with strain shadows, and strained & fish structure minerals showing right & left lateral sense.