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SHRIMP zircon age of a Proterozoic rapakivi granite batholith in the Gyeonggi massif (South Korea) and its geological implications

MINGGUO ZHAI^*,, ZHIYAO NI^*, CHANG WHAN OH, JINGHUI GUO^* and SEON GYU CHOI

^* Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
Department of Earth and Environmental Sciences, Chonbuk National University, Chonju, 561-576, South Korea
Department of Earth and Environmental Sciences, Korea University, 136-701, South Korea

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

A large rapakivi granite batholith in the Neo-Archaean/Palaeoproterozoic Odesan complex, northeastern Gyeonggi massif, South Korea, has been dated at 1839 ± 10 Ma using SHRIMP U–Pb analysis of zircons. The age, petrological and geochemical characteristics of this batholith are similar to those of the rapakivi granite batholiths exposed in the Rangnim massif of North Korea and in the Miyun–Chengde complex of North China. The country rocks of these rapakivi granite batholiths are also comparable; all are composed of granitic gneisses and banded iron formation (BIF)-bearing supracrustal rocks metamorphosed to amphibolite- to granulite-facies. This study provides new evidence for the suggestion that the Gyeonggi and Rangnim massifs may share an affinity with the Precambrian basement of the North China craton. The study provides new insight into the possible eastward extension of the Sulu orogenic belt in the Korean peninsula and further provides evidence to correlate the Korea basement to a possible global 2.1–1.8 Ga supercontinent.

Key Words: rapakivi • granite • SHRIMP data • zircon • South Korea

This article has been cited by other articles:

				M. ZHAI, J. GUO, P. PENG, and B. HU U Pb zircon age dating of a rapakivi granite batholith in Rangnim massif, North Korea Geological Magazine, May 1, 2007; 144(3): 547 - 552. [Abstract] [Full Text] [PDF]