Using balanced cross sections for structural generation(originating) investigation of east Alborz(Khosh yeilagh area)

Category Tectonic & Seismotectonic
Group GSI.IR
Location 20th symposium on geosciences
Holding Date 16 April 2008

     Balanced cross sections are used to regenerate of fold thrust belt deformations. Preparing of this kind of cross sections for eastern Alborz revealed that eastern Alborz contains a set of thrust sheets with vergence to south east and followed by folding systems, majorly Fault-bend fold and Fault-propagation fold. Geometrical and dynamical analysis of faults and folds and their relation with sedimentary gaps, indicates that tectonic activities have been responsible of few faults and fols, but significant vertical movement till Oligocen. Main structures in this area have been formed during Oligocen and contemporanous with Pirnean phase. Last Alpine movements (Pasadenian phase) caused in tilting of Neogene and Quaternary units and resulted new formed structures activated older structures. Finally, orogenic phases in this area made, sedimentary cover of Alborz fold thrust belt has been shortened about 52% compared to the time of its formation.

tags: SEMNAN