Economic Geology and Geochemistry of the Sedimentary Phosphate of Reza-Abad, Southeast of Kazeroun

The area is located in 25 Km southwest of kazerun city in the Zagros folded zone. The Phosphate beds have been deposited in the core of the Sarbalesh-Baznak anticline with NW-SE trend. Stratigraphically, the Gurpi, Pabdeh, Asmari, Gachsaran, and Bakhtiyari Formations are outcropped in this area. Petrographic studies show that phosphate-bearing layers are composed of calcite, phosphate, glauconite and iron oxide with packstone to wackestone texture. Microfossil studies proved the age of Oligocene for the phosphate layers. The XRF and XRD analyses demonstrated that the phosphate-bearing mineral is fluor-apatite (Ca (PO4)3F). Sedimentary phosphate in this area was formed under the high energetic environment condition, phosphate saturated waters, and in the boundary of oxidation – reduction zone.