تكوين زمين ساختي و مدل ساختاري پنجره زمين ساختي آق دربند

Tectonic Evolution and Structural Model of Aghdarband Tectonic Window

The basement of Kopet-Dagh basin is formed of pre-Jurassic rock units. The exposed units in Aghdarband area were strongly deformed during Hercynian, Cimmerian and Alpian orogenies. Hercynian orogeny generated metamorphism of green schist facies with strong faulting, whereas Cimmerian orogeny caused Triassic thrust faulting. Alpine orogeny (Paleogene to Recent) causesd the folding of sediments of the Kopet-Dagh basin and had formed initially thrust faults and then, oblique slip faults (strike slip with reverse movement) in the region. These faults are still active. Rock units in the basement contain sedimentary and igneous rocks. The sedimentary rocks are composed mainly of volcanogenic siliciclastic sediments, including conglomerate, sandstone and shale (Devonian to Triassic age). The small outcrops of igneous rocks are exposed in the southwest of the Aghdarband area and include two rock units: 1-Darreh Anjir ophiolith complex that contains gabbro and ultramafic rocks. 2-Acid tuffs. These rocks were mixed with ophiolithic rocks by thrust faults and appeared in the form of thin nappes.