Writers : G. J. H. McCall
Refference : Geosciences Scientific Quarterly Journal,No.:9,P.:62

Abstract :

Two major geotectonic problems related to the New Global Tectonics are considered here in the light of
the regional mapping of the Iranian Makran, now complete and published or in the press. The first concerns the Mesozoic (locally extending to the Paleocene or Eocene) inner sea of southern and central Iran, now represented by ophiolites and associated deep- sea sediments or flysch deposits. The importance of this inner ocean and the Sanandaj- Sirjan/Bajgan- Dur- Kan microcontinental block is stressed. The second concerns the peculiar structural history evident from analysis of structures in the Cenozoic flysch and neritic sediments of the Makran: this does not conform to the model of Moore & Karig (1980) in that there was apparently only a single cataclysimic episode of reverse faulting, folding and dislocation, dated as late Miocene to early Pliocene, accompanied by uplift leading to molassic piedmontane deposition: this episode was accompanied by a jump of the subduction front out into Its Present position in the Indian Ocean. Though the flysch sequences range from late paleocene to early Miocene, and are all strongly folded, faulted and locally dislocated, the progressive move south of the locus of flysch deposition before this jump appears to have been accompanied only by quite minor deformation, mainly upwarping of the earlier deposits.

Subject List : Plate tectonic