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Constraints of REE Distribution Patterns in Core Sediments and their Provenance, Northern East China Sea  

Jung Hoi-Soo (Marine Environment Research Department, Korea Ocean Research and Development Institute)
Lim Dhong-il (Southern Coastal Environment Research Department, Korea Ocean Research and Development Institute)
Yang Shou Ye (Department of Marine Geology and Geophysics, Lab. Of Marine Geology, Tongji University)
Yoo Hai-Soo (Marine Environment Research Department, Korea Ocean Research and Development Institute)
Publication Information
Economic and Environmental Geology / v.39, no.1, 2006 , pp. 39-51 More about this Journal
Abstract
Rare earth elements(REEs) in transgressive shelf core sediments were analysed to identify constraints of REE distribution patterns and sediment provenances in the northern East China Sea(ECS). Sediments of Chinese and Korean rivers, such as Huanghe and Yangtz rivers, Keum and Yeongsan rivers that supply sediments to the northern ECS, were also analysed to figure out their typical REE distribution patterns. The distribution patterns of Chinese and Korean river sediments, which are normalized with upper continental crust (UCC) REE values, appear to be enriched in middle rare earth elements (MREEs) in Chinese river sediments, whereas in light rare earth elements (LREEs) in Korean river sediments. We assign the MREE-enriched convex-type distribution pattern in Chinese river sediments as 'C-type', and the LREE-enriched linearly decreasing pattern in Korean river sediments as 'D-type'. A major constraint of the REE concentration in northern ECS core sediments is interpreted to be LREE-enriched monazite $((Ce,\;La)PO_4)$ that is ubiquitous in and around the study area. Meanwhile, the distribution pattern of northern ECS sediments appears to be between the C-type and the D-type. We suggest that the nothern ECS sediments are the mixture of China and Korea riverine sediments that have been accumulated in paleo-river mouth, paleo-coast, and present-day shelf environment as well.
Keywords
transgressive shelf sediments; rare earth elements; monazite;
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