ژنز دگرساني اسيد سولفات در منطقه سرخ شاد، شمال غرب انارك(ايران مركزي)

Geneses of Acid Sulfate Alteration in Sorkhshad Area Northwest of Anarak (Central Iran)

the hydrothermal alteration is affected as a progressive model. Many types of alteration can be observed in the area. Protilites often have andesitic extrusive body. Field study and electron microprobe, NAA, analysis characterized type of alteration and member of minerals. Alteration of the area according to tectonic consists of two major types. 1- Propylitic, Sericitic, Silicification, 2- Argillic zone consists of intermediate and advanced argillic alteration. Alunitic and acid sulfate are subset of advanced argillic alteration. The major types of mineral in these alterations are hematite, limonite, epidote, quartz. Acid sulphate soils are the nastiest soils in the world. High concentrations of heavy metals are toxic. Different hazards are posed by different kinds of acid sulphate soil.