GSINET | Geological Survey of Iran , North - East Territory

Writers : Nazari,Hamid
Refference : Geosciences Scientific Quarterly Journal,No.29_30
Publishing Year : 1377

Abstract :

East Iranian structural Belt, one of pre-Cenomanian age. Stratigraphical and lithological evidence indicating the beginning of tensional movements between Iranian and Afghan microcontinents in Early Cretaceous. Thus, creating the sedimentary basins of East Iran and this in�led to the appearance of the ophiolitie sequence in the area. The alleged ocean, created in this area, was closed during the Late Crtaceous and furthermore, the foreland basins were dominant features throughout the Cenozoic times.
Regarding the structural evolution of the area, varying hypotheses have been propounded. But, considering the structural characteristics of the area as. compared to the other parts of the Lut Block, the structural model of the Ghalehsorrh- Nowzad Fault is more hostile solution for the emplacement of the metamorphics as well as the ophiolitic sequences. The latter fault itself is one of the branches of Ire Neh Main Fault.
However, that Segment of Ghalehsorkh- Nawzad Fault in the east of the area of Sarbisheh, 1:100,000 Map is a strike-slip fault with a dixtral disptacement in its first order class, whereas, occasionally sinistral in its secondary-third orders. The structural evolution of this fault !curred in the Riedel system with positive/negative flower structures in its compress ional and tensional parts.
The stress mainly concentrating in the junction of different segments and in their tip points. The release of these stresses are likely the of the recent earthquakes.

Articles

Structural geology of Qaleh Sorkh_ Nowzad fault east of Birjand (Sarbisheh)