Abstract
Abstract A systematic geochemical examination and zircon U‐Pb dating of Neoproterozoic bimodal volcanic rocks from the Chungju area in the northeast segment of the Okcheon Metamorphic Belt (OMB), South Korea, allow a comparison with similar rocks from the Nanhua Rift, South China. The bimodal metavolcanics of the Chungju area comprise the subalkaline to alkaline basalts (hereafter “mafic metavolcanic rocks”) and trachytes (hereafter “felsic metavolcanic rocks”). The mafic metavolcanic rocks are characterized by light rare earth element (LREE)‐enriched and “humped” trace‐element patterns with moderate depletions in Sr and Ti and variable but reasonably low eNd(T) values between +0.83 and +2.99. These geochemical features are consistent with the area's origin in an ocean island basalt (OIB) mantle source with minor crustal contamination. The felsic metavolcanic rocks are characterized by LREE‐enriched patterns with a remarkable negative Eu anomaly. They display an overall enriched trace‐element pattern with...
Published Version
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