Mineralogy and geochemistry of the Tang-e-hana skarns – Neyriz, Fars Province

Tang-e-Hana skarn is located at part of the Zagros ophiolitic sequence, and then it is considered as a part of the Zagros structural province. According to the current study, this skarn is classified in 4 main groups: 1- Wollastonite skarn 2- Augite wollastonite skarn 3- Grossular wollastonite skarn 4- Andradite titanite augite wollastonite skarn. Geochemical characteristics indicate that Tang-e-hana skarn is lies in the calcic skarn domain. In addition, percentage of TiO2 in the fourth type of these skarns (bearing titanite) reaches 4%. This fact is important for concentration of REE and other trace elements in titanite. The field and mineralogical evidence illustrated that the studied skarns are endoskarns. These evidences include a high percentage of calc-silicate and non-metallic minerals and in contrast a low percentage of metallic minerals. Therefor, Tang-e-hana skarn is important for its non-metallic minerals such as wollastonite and garnet. The study of mineral paragenetic sequence and the variation diagrams of %TiO2 and %Al2O3 per %CaO suggested that wollastonite skarn is formed at the early stage and andradite – titanite – augite - wollastonite skarn at the late stage of skarnification.