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Geochemical and Structural Geological Approach for clarifying Stratigraphy of Quartzite in the Paju Area: an Application of Rare Earth Element and Nd Isotope in Stratigraphy  

Koh Hee Jae (Groundwater and Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources)
Lee Seung-Gu (Geological and Information Division, Korea Institute of Geoscience and Mineral Resources)
Lee Byung-Joo (Groundwater and Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
The Journal of the Petrological Society of Korea / v.14, no.2, 2005 , pp. 116-126 More about this Journal
Abstract
The Precambrian quartzite and calc-schist layers experienced multi-1310ing events are distributed along the two kinds of U-shaped 1310 (Fold I and II) with $N10^{\circ}E-directed$ fo1d axis in Wollong-myeon, Gwangtan-myeon, Jori-myeon of Paju city, the northeastern part of Gyeonggido. Occurrence of 10 layers of quartzite and 4 layers of calc-schist is not clear whether quartzite and schist layers were deposited sequentially each other or one to two layers of quartzite and schist were distributed repeatedly by isoclinal folding and thrusting, because of lack of sedimentary structures. In this paper, we tried to clarify the correlative relationship among the quartzite beds which are distributed along the U-shaped folds using geochemical tools such as rare earth element (REE) patterns and Nd isotope ratio. Quartzites have characteristics of LREE-flattened, HREE- slightly depleted patterns. They also show Ce negative anomaly whereas there are no Eu anomalies. As a result, quartzite beds occurred along the bilateral sides of fold axis show very similar REE patterns from outer side to inner side of 1314. The Nd model age of quartzite layers shows a trend that the inner part of fold is younger than the outer part of it. Such geochemical characteristics suggest that bilateral quartzite beds occurred along the fold axis were derived from the cogenetic source materials. The REE patterns and trace element geochemistry of mica schist intercalated within quartzite indicate that the quartzite and mica schist may be derived from different source materials. Our results suggest that REE and Nd isotope geochemistries may be very useful in clarifying the relationship of sedimentary deposits which do not show stratigraphical and structural connections in the field.
Keywords
Paju; Quartzite; Rare Earth Element; Nd isotope; Stratigraphical Relationship;
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