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

Published online by Cambridge University Press:  09 March 2007

MINGGUO ZHAI ,
JINGHUI GUO ,
PENG PENG  and
BO HU
MINGGUO ZHAI
Affiliation:
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
JINGHUI GUO
Affiliation:
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
PENG PENG
Affiliation:
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
BO HU
Affiliation:
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
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Abstract

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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.

Keywords

Rapakivi graniteSHRIMP U–Pb zircon ageRangnim MassifNorth Korea
Type
Original Article
Information
Geological Magazine , Volume 144 , Issue 3 , May 2007 , pp. 547 - 552
Copyright
© 2007 Cambridge University Press