International Journal of Applied Research
Vol. 1, Issue 9, Part J (2015)
High temperature diagenetic magnesite deposit of Jhiroli, Kumaon lesser Himalaya, India
Yadav RN, Sen Gupta D, Sen Gupta HP
Jhiroli magnesite deposit of Kumaon Lesser Himalaya is associated with dolostone of Deoban Formation. It occurs in bedded nature and mainly crystalline form with fairly coarse crystals. Development of stromatolites is observed which played important role in the formation of magnesite. The relationship between magnesite and different associated constituents exhibits the most interesting and varied assemblages of textural and structural features. Geochemical studies reveal that the magnesite is predominantly composed of MgO and volatile constituent i.e. carbon dioxide as established by its relationship with carbonate content. Except Cao, MgO and Sr there is no noteworthy variation in the other major and trace element distribution of the magnesite and the host dolostone. Fluid inclusion studies in magnesite and dolomite suggest that the magnesitizing fluids were aqueous NaCl brines of variable salinities ranging from 6.37 to 35.65 wt% NaCl equivalent. The maximum homogenization temperature of magnesite in triphase fluid inclusion ranges between 2600 and 270 0C but in the case of biphase fluid inclusion maximum homogenization temperature of dolostone and magnesite is almost same and ranges between 2200 and 230 0C. These homogenization temperatures are within the range of diagenetic recrystallization. Based on the above observations it is concluded that the magnesite is of diagenetic origin under high temperature restricted basin and lagoonal setting.
How to cite this article:
Yadav RN, Sen Gupta D, Sen Gupta HP. High temperature diagenetic magnesite deposit of Jhiroli, Kumaon lesser Himalaya, India. Int J Appl Res 2015;1(9):656-661.