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Clay Mineral Distribution in the Yellow Sea Surface Sediments: Absolute Mineral Composition and Relative Mineral Composition  

Moon, Dong-Hyeok (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Yi, Hi-Il (Marine Geoenvironment Research Division, Korea Ocean Research and Development Institute)
Shin, Dong-Hyeok (Marine Geoenvironment Research Division, Korea Ocean Research and Development Institute)
Shin, Kyung-Hoon (Dept of Environmental Marine Sciences, Hanyang University)
Cho, Hyen-Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.21, no.3, 2008 , pp. 289-295 More about this Journal
Abstract
We studied the difference between the clay mineral content in the bulk marine sediments (absolute clay mineral composition) and clay mineral content only in total clay minerals (relative clay mineral composition) of the Yellow Sea marine sediments, and correlated the relationship between their distribution patterns. We used 56 Yellow Sea Surface sediments collected at the second cruise in 2001 of KORDI, and determined the absolute mineral composition using the quantitative X-ray diffraction analysis. Yellow Sea surface sediments consist of primary rock forming minerals including quartz (average 44.7%), plagioclase (15.9%), alkali feldspar (10.0%), hornblende (2.8%) together with clay minerals (illite 15.3%, chlorite 2.6% and kaolinite 1%) and carbonates (calcite 1.7%, aragonite 0.6%). Absolute clay mineral contents are very high in the region extending from the southeast of Sandong Peninsula to the southwest of Jeju Island. In contrast, it is very low along the margin of the Yellow Sea. Such distribution patterns of absolute clay mineral content are very similar to those of fine-grained sediments in the study area. The average relative clay mineral composition of illite, chlorite, and kaolinite is respectively 80.3%, 14.9% and 4.8%. The distribution pattern of relative mineral composition shows very different phenomenon when compared with those of absolute mineral composition, and also do not exhibit any positive relationship with that of fine-grained sediments in which clay mineral composition is abundant. Therefore, we suggest that the relative clay mineral compositions and their distribution patterns must be used very carefully when interpreting the origin of sediment provenance.
Keywords
Yellow Sea; surface sediment; clay mineral; Quantitative X-ray diffraction analysis; absolute mineral composition; relative mineral composition;
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Times Cited By KSCI : 1  (Citation Analysis)
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