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The tectonic setting of the eastern margin of the Sino-Korean Block inferred from detrital zircon U–Pb age and Nd isotope composition of the Pyeongan Supergroup (upper Palaeozoic – Lower Triassic), Korea

Published online by Cambridge University Press:  20 November 2017

MUN GI KIM ,
YONG IL LEE ,
TAEJIN CHOI  and
YUJI ORIHASHI
MUN GI KIM
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
YONG IL LEE*
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
TAEJIN CHOI
Affiliation:
Department of Energy and Resources Engineering, Chosun University, Gwangju 61542, Korea
YUJI ORIHASHI
Affiliation:
Earthquake Research Institute, The University of Tokyo, Tokyo 113-0032, Japan
*
†Author for correspondence: [email protected]
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Abstract

The upper Palaeozoic succession (Pyeongan Supergroup) in central eastern Korea is well correlated with the equivalent successions distributed in North China, suggestive of the Korean upper Palaeozoic being part of the Sino-Korean Block. Detrital zircon U–Pb ages and Sm–Nd isotope compositions of the Pyeongan Supergroup in the Samcheok coalfield of the Taebaeksan Basin were analysed. A single predominant zircon age peak at c. 1.9 Ga (> 70%) is marked in all sedimentary units, followed by varying amounts of minor late Palaeozoic grains (up to 30%). The rarity of Meso- to Neoproterozoic- and Silurian-aged zircons confirms that sediment influx from the South China and Qinling blocks was insignificant. The 2.0–1.8 Ga-dominated zircon age pattern and the Nd isotope composition (average εNd(0) = −15.5±4.0) of the Pyeongan Supergroup most closely reflect the signature of the Yeongnam Massif basements, which supports a previous hypothesis that the Pyeongan Supergroup was mostly derived from a palaeo-orogen located to the east–southeast. Relatively higher εNd(0) values (> −10.1) in the lowermost and the upper parts of the succession are closely matched by the increased occurrence of syn-depositional-aged zircons, which indicates considerable mixing of juvenile materials at c. 320 Ma and 260 Ma. Both arc-related magmatic events are interpreted to have been related to oceanic subduction, suggesting that the eastern margin of the Sino-Korean Block was an active continental margin during late Palaeozoic times.

Keywords

late PalaeozoicSino-Korean BlockPyeongan SupergroupTaebaeksan Basin
Type
Original Articles
Information
Geological Magazine , Volume 156 , Issue 3 , March 2019 , pp. 471 - 484
Copyright
Copyright © Cambridge University Press 2017 

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