Geological and genetical characteristics of Agates in Ferdows area (south Khorasan)

Agates of the Ferdows area (north of Lut Block) occurred in open space and cracks filling form in the Paleogene volcanic rocks. These rocks are found as red, smoky, blue, violet, green, and colorless and as a vein, mosaic, geode, banded, stellar, cauliflower, moss, and circular fabrics. The altered host rocks’ fragments as enclave occurred within agates without reaction rims. Fluid inclusion studies on some of the agates show arrange of homogenization temperature from 102 to 233 ℃ and salinities from 2 to 11 wt% NaCl equiv. The REE contents of these rocks are low, only the vein-type agates were analyzed for all REEs. Most of the studied agates display Eu negative anomaly and positive Yb anomaly in REE normalized pattern along with