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SHRIMP U-Pb Geochronology of Detrital Zircons from Iron-bearing Quartzite of the Seosan Group: Constraints on Age and Stratigraphy  

Cho, Deung-Lyong (Division of Geology and Geoinformation, Korea Institute of Geoscience and Mineral Resources)
Kim, Yong-Jun (Faulty of Earth System and Environmental Sciences, Chonnam National University)
Armstrong, Richard (Research School of Earth Sciences, Australian National University)
Publication Information
The Journal of the Petrological Society of Korea / v.15, no.3, 2006 , pp. 119-127 More about this Journal
Abstract
Detrital zircons in iron-bearing quartzite of the Seosan Croup from southeastern part of the Cyeonggi Hassif were analysed for SHRIHP U-Pb ages. Among 42 analyses, 38 data yield concordant ages (less tan 10 % discordancy), and they concentrated at 1781~1898 Ma (n=19), $1781{\sim}1898\;Ma(n=19),\;1935{\sim}1941\;Ma(n=4),\;1996\;Ma,\;2120\;Ma\;2403{\sim}2459\;Ma(n=5)$, 2661 Ma and 3198 Ma. The data indicate that sedimentation of iron-bearing quartzite should be after ca 1.78 Ga (the youngest detrital zircon age), and argue against some of conventional idea that iron-bearing quartzite of the Seosan Group might be correlated with the Archean iron-bearing quartzite in the North China Craton.
Keywords
Iron-bearing quartzite; Seosan Croup; detrital zircon; SHRIMP;
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