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U–Pb zircon age dating of a rapakivi granite batholith in Rangnim massif, North Korea

MINGGUO ZHAI^*,,,, JINGHUI GUO^*,, PENG PENG^*, and BO HU^*,

^* Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chines Academy of Sciences, Beijing 100029, China
Beijing SHRIMP Center, Chinese Academy of Geological Sciences, Beijing 100037, China
State Key Laboratory of Lithosphere Tectonic Evolution, Beijing 100029, China

Author for correspondence: mgzhai{at}mail.igcas.ac.cn

Rapakivi granites and several small leucogabbroic and gabbroic bodies are located in the Rangnim Massif, North Korea. The largest batholith in the Myohyang Mountains covers an area of 300 km² and was intruded into Precambrian metamorphosed rocks. It has a SHRIMP U–Pb zircon weighted mean ²⁰⁷Pb/²⁰⁶Pb age of 1861 ± 7 Ma. The country rocks of rapakivi granites are Neoarchaean orthogneisses and Palaeo-Mesoproterozoic graphite-bearing metasedimentary rocks of granulite facies, and they are similar to those of the rapakivi granites and anorthosites exposed in South Korea and in the North China Craton. We conclude that the three massifs in the Korean Peninsula commonly record an identical Palaeo-Mesoproterozoic anorogenic magmatic event, indicating that they have a common Precambrian basement with the North China Craton.

Key Words: Rapakivi granite • SHRIMP U–Pb zircon age • Rangnim Massif • North Korea