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http://dx.doi.org/10.9727/jmsk.2018.31.4.257

Provenance Study of 99MAP-P63 Core Sediments in the East China Sea  

Choi, Jae Yeong (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
Koo, Hyo Jin (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
Cho, Hyen Goo (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.31, no.4, 2018 , pp. 257-266 More about this Journal
Abstract
East China Sea (ECS) is known to be supplied with large amounts of sediments form Huanghe, Changjiang and various rivers in Korea. Many studies have been conducted to identify the effects of rivers and deposition process of ECS, but no consensus has been reached. In this study, clay minerals, rare earth elements (REEs) and grain size were analyzed to study the provenance and sedimentation environment of core 99MAP-P63 in ECS. Clay mineral contents of 99MAP-P63 are abundant in order of illite, chlorite, kaolinite, and smectite. The provenance of 99MAP-P63 sediments using clay minerals is interpreted as the Changjiang regardless of depth. As a result of REEs analysis, 99MAP-P63 sediments are very similar to Chinese rivers sediments. Therefore, the provenance of 99MAP-P63 is Changjiang, and the influence of Korean river seems to be insignificant. 99MAP-P63 sediments are generally classified as sandy silt, but the top of the core is divided into sand with a sand contents of 85 %. Compared with surrounding cores, sandy silt sediments arecorresponded to the low stand stage when sea-level was low, and the sediments were thought to have been supplied directly through the paleo-Changjiang. Sandy sediments in uppermost of core are corresponded to transgressive stage. Although distance from estuary was increased due to sea-level rise, it was possible to supply coarse sediments due to high bottom stress, and the paleo-Changjiang sediments deposited in study area were re-deposited.
Keywords
Clay mineral; rare earth elements; sediment provenance; East China Sea; Changjiang;
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