The Petrochemical and Structural Study on the Charyong Batholith and its Associated Metallic Deposits

차령화강암(車嶺花崗岩) 저반(底盤)과 이에 관련된 금속광상(金屬鑛床)의 암석학적(岩石學的) 및 지질구조적(地質構造的) 연구(硏究)

The Charyong batholith extends northeasterly from the west coast to the west of Wonju in the central parts of Korean Penninsula. The batholith is separated by the metamorphic complex into the northern and the southern granites. and is believed to intrude during the Daebo orogeny of early Jurassic to early Cretaceous age. It constitutes a sort of anticlinorium and the metamorphic complex can be regarded as a huge roof pendant. The modal analysis indicates that the Charyong batholith belongs to a series of adamellite-granodiorte-to-nalite. The oxidation property happened during a magmatic segregation reveals that the batholith shows in general orogenic assimilation trend. The granites of early to middle Jurassic age show orogenic assimilation trend, whereas those of late Jurassic to early Cretaceous age post orogenic noassimilation trend. The fracture system of the whole region is two folds: the fractures having attitute of $N25{\sim}40^{\circ}E$ and $70^{\circ}SE$ are regarded as tension fractures, and those of NS, and 50E to vertical and $N50^{\circ}E$ and $80^{\circ}E$ to vertical as shear fractures. All these facts suggest definitely that the Charyong batholith is the syntectonic intrusives during the Daebo orogeny. The mineral deposits in the area studied are gold-silver deposits in majority which was named by O,J.Kim(1970) as the Chonan metallogenic province. They are sulfides baring quartz veins which were emplaced along the tension and shear fractures originated by the Daebo orogeny.