The Indications Of High Solubility In The Bed Rock Of Hamedan Sinkholes Area.

Abstract:
      The plain of famenin_Kabboudrahang and Ghahavand located in the north of Hamedan province that in 10 recent years some phenomena such as occurrence of sinkholes and gaseous wells have been appeared in this area. These phenomena can be interpreted by speciality conditions of bed rock of area. In this study, indications of solubility were attended. In initial, with measurement of joints and fractures systems and study of thin sections, lithological characteristics of bed rock and potential of solubility were studied. Then, water samples of area and other gaseous area of province were analysed. Also, free carbon dioxide, saturation index and stability index were calculated. More than 1000 mg/li amounts of free carbon dioxode, positive amounts of saturation index, less than 6 amounts of stability index, microscopic and macroscopic voids in bed rock, high amounts of carbonat and calsium ions in the waters of area and thin layers of calsium-carbonat on surface of some chanells indicate that the bed rock has been solvated highly.
  
   Keyword:solubility,Bed,Rock,limestone,free carbon dioxide,Sinkhole,Hamedan.