- 123 - OR4-179
Albitite-Greisen Sericite Deposit of the Yeongweol Area, and its Significance in the Taebaegsan Region
Jang Han Yoo*․Sei Jung Chi
Korea Institute of Geoscience and Mineral Resources 30 Gajeong-dong, Yooseong-gu, Daejeon, Korea
042-868-3101 [email protected]
Summary
Yeongweol sericite deposit of the Gangwon Province is regarded as one of the albitite-greisen type due to post-magmatic alkali metasomatism. The other sericite deposit of the same origin is the Daehyun mine located in the Gyungbug Province.
Sericite was originateded from granite which probably intruded the migmatite and gneiss of the Pre-cambrian age. Jangsan Quartzite which played as the capping rock protected from the leakage of the hydrothermal solution for the genesis of sericite deposit. It is known that albitite-greisen deposits are mainly formed in the middle and late stage of the geosynclinal cycle of development.
Granite commomly contains pegmatite with tourmaline crystals, and potassium metasomatic part, sodium metasomatic part and strongly sericitized outcrops are also found as we go to the higher elevation in the vicinity of the mine. Chemical analyses show the higher K2O contents as the sericitization are preceded.
Albitite-greisen deposits are inclined to contain W, Sn, Mo and several REE's such as BE, Nb and Li, and so Taebaegsan mineralized areas interbedded with lots of carbonate formations are still worthwhile to survey for those metallic deposits.
