Granites and Tectonics of South Korea

南韓은 地構造的으로 4개의 地質區로 나누어 진다. 京畿陸塊와 嶺南陸塊는 先캠브리아紀의 片麻岩과 片岩으로 구성되어 있다. 沃川地向斜帶는 소위 支那方向인 西南南東으로 韓半島를 비스듬히 가로지르고 있다. 沃川地向斜帶의 北東部는 主로 古生代와 中生代 초기의 堆積岩層으로 되어있고 西南部는 후기 先캠프리아紀의 變成岩層群으로 되어있다. 慶尙盆地는 白堊紀의 두꺼운 陸成堆積層과 安山岩類로 되어있다. 第三紀의 몇 개의 小盆地가 한반도 동남부와 제주도에 分布하고 주로 海成層과 현무암류로 되어있다. 쥬라紀의 大寶花崗岩이 京畿陸塊, 嶺南陸塊, 沃川地向斜帶內에 支那方向으로 貫入分布한다. 한편 白堊紀의 佛國寺 花崗岩은 慶尙盆地에 分散分布한다.

South Korea is divided tectonically into four segments. The Kyonggi-Ryongnam massif is composed of Precambrian schists and gneisses and consititutes a base for the succeeding formations. The Okcheon geosynclinal zone in the Kyonggi-Ryongnam massif strectches from southwest to northeast diagonally across the peninsula in a direction known as the Sinian direction. Its northeastern part is composed primarily of Paleozoic to early Mesozoic sedimentary formations and the southwestern part of the late Precambrian Okcheon metamorphic series. The Kyongsang basin occupies the southeast and southwest of the peninsula and is made up of a thick series of Cretaceous terrestrial sedimentary and andesitic rocks. A few small Tertiary basins are scattered in the eastern coastal area and in Cheju Island, and are composed of marine sedimentary and basaltic rocks. Jurassic Daebo granites intrude the Kyonggi-Ryongnam massif and the Okcheon zone in the Sinian direction, whereas late Cretaceous Bulkuksa granites are scattered randomly in the Kyongsang basin.