Geochemistry of mudstones and sandstones Late-Miocene-Pleistocene in Chabahar coastal

The Chabahar coastal area is located in the Makran sedimentary-structural zone. The basement of the Makran zone consists of an oceanic crust and flysch units which completely overlie by thick sequences of mudstone, sandstone and conglomerate in the Chabahar area. Fifty samples were taken from sections of Tiss, Ramin, Lipar, Gorankash and Gareeandar and were studied by calcimetry, XRF, ICP and XRD. The result of calcimetry analyses shows lime contents of marl samples vary from 9 to 21 percent, and it is better to introduce them as mudstone. Na2O, P2O5 and Fe2O3 contents of the study rocks are lower than the upper continental crust CWI= 88.8 shows arid to semi-arid. Based on geochemical data, mudstones and sandstones of Chabahar coastal area were derived from a quartzose sedimentary source. Geochemical characteristics of the study rocks and using of discrimination diagrams for tectonic setting, based on major and trace elements, suggest that they formed in an active continental margin, This conclusion is logical because the Makran zone is an active subductional continental margin.