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shrimp u–pb zircon age

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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, BO HU
Journal:

Geological Magazine / Volume 144 / Issue 3 / May 2007

Published online by Cambridge University Press:

09 March 2007, pp. 547-552
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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.