抄録
We have summarized in this review that the concentration of iodine and chlorine in brine distributed in Japan Sea side, Pacific coast side of Japan, Oklahoma State in USA. We have introduced the concentration mechanisms of iodine based on sedimentological and geological points of view in Boso peninsula, central Japan. These are as follow;
1. The organic matter both of continental origin such as plant fragment in turbidites as absorption materials and of marine origin such as plankton as original iodine supplier are important to produce a high concentration of iodine in brine.
2. Depositional environment such as neritic has poorly concentration of iodine, but deep marine environment such as bathyal has relatively high concentration of iodine in the Pacific coast side of Japan.
3. The ocean current system is another controlling factor of iodine concentration such as more iodine concentration region located in counter part of warm and cold water currents, whereas poor iodine concentration region located in either one.
But the radioactive age of iodine indicates 50Ma in Boso area can not explain reasonable brine movement based on geological framework.
