Salt diapirs preferably rise above basement faults in extensional basins. A series of analogue and numerical models were developed in order to assess the supply of salt from the footwall and hanging wall to a diapir and to study the influence of basin inversion on the diapir development. The modelling scenario was based on the Kłodawa Salt Structure evolution (central Poland). The experiments show that the ductile material derived from the footwall constitutes the dominant portion of the diapir developed due to model extension, and this material occurs both in the footwall and hanging wall parts of the diapir. Shortening of the analogue models resulted in thinning of the diapir and shifting its stem onto the footwall. Ductile material become redistributed inside the diapir, however footwall material still prevails in the diapir structure. Results from the numerical models show that the magnitude of the basement fault governs the amount of salt supply to a diapir across the fault and that there is a differential salt supply from the hanging wall and footwall with time.
Anal y sis of folds car ried out in the K³odawa Salt Struc ture (cen tral Po land) showed that the Up per Perm ian (Zechstein) siliciclastic-evaporitic suc ces sion is het er o ge neously folded, re sult ing from dif fer ences in bed com pe tence and stra tig ra phy. Rock salt and pot ash-rich suc ces sions of each Zechstein cy cle are in ter nally folded and con tain mul ti ple sheath folds, orig inated dur ing lat eral flow of salt at an early stage of de for ma tion. These folds have been re folded by up right sheath folds within thick PZ1-PZ2 rock salt com plexes. The lack of superposed folds in PZ3-PZ4 salt com plexes and un con formi ties between the PZ1-PZ2 and PZ3-PZ4 units in di cate that the rock salt beds were in ter nally folded prior to diapirism, in de pendently in each salt bed. The PZ1-PZ2 rock salt beds welded dur ing lat eral flow and were folded to gether into up right sheath folds dur ing the up ward flow of salt. These superposed folds clus tered into subordinary diapirs and pierced through the younger de pos its. The lat ter sunk in salt masses to form large-scale synclinoria, the strata of which con tain early tec tonic and weakly de formed sed i men tary struc tures.
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