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Abstract ▼ AI-Helper

Vertical drilling was carried out to document the mineralogical and geochemical characteristics of the Upo wetland sediment in the Changnyeong area of Gyeongnam province. The core sediments (UP-1) in the wetland can be divided into four units based on grain size: Unit 1 of clayey silt, Unit 2 of sil...

Vertical drilling was carried out to document the mineralogical and geochemical characteristics of the Upo wetland sediment in the Changnyeong area of Gyeongnam province. The core sediments (UP-1) in the wetland can be divided into four units based on grain size: Unit 1 of clayey silt, Unit 2 of silty clay, Unit 3 of clayey silt and Unit 4 of clayey silt. Three thin sand layers are developed in the lower part of Unit 3. XRD analysis of the sediments reveals that the sediments have similar compositions to each other. Major oxide composition of most samples lie within a narrow ranges of variation. In the lower part of the Unit 3, however, SiO₂, K₂O and Na₂O are more abundant than the other samples, which indicates more abundant quartz and feldspar minerals in the lower part than samples from the other units. Molar diagrams of A-CN-K and A-CNK-FM, and trace element compositions show the concentrated distributions and narrow ranges except the lower part, respectively. Chondrite-normalized REE patterns of the sediments show steep LREE and flat HREE slopes with slightly negative Eu anomalies. Mineralogical and geochemical compositions of the Upo sediments indicate mostly homogeneous sediment materials from the source area were deposited for the Upo wetland. There might have been changes of depositional environment such as heavy rainfalls or its related floodings during the deposition of the lower part of Unit 3.

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