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제안 방법
- , 2007). In this study, we present the clay minerals and geochemical composition of sediments collected AOJI in order to identify the sediment origin.
대상 데이터
- A total of 182 sufficient sediment samples were collected from the study area (Fig. 1) between September 1999 and June 2000 with R/V Ara of Cheju National University, the Republic of Korea. In the laboratory, grain‐size analyses were performed by standard procedures (Krumbein and Pettijohn, 1938).
- 7). Most of the study area sediment samples are located between the Huanghe and Changjiang sediments averages, especially more approximate to the Huanghe cluster, but the sediments in the southwest part of the study area (Stns. 105, 134, 138, 168) are closely plotted with Changjiang River sediments. In contrast, sediment samples off the northeastern Jeju Island coast (24, 26, 28, 54, 56, 59) show the highest values than those of the river sediments and other regions, which are supplied mostly from Jeju Island in a Quaternary shield volcano, composed of hawiite, alkaline basalt, megearite and trachyte (Park and Kwon, 1993).
- The marine environment of the study area, that includes the East China Sea and Yellow Sea, lies within the continental shelf in water less than 150m deep (Fig. 1). The western part of the study area has a broad, almost flat seafloor and gradually steeper gradient of isobathparrom southly stto northeastward average water depth 65m, but the seafloor toward the southeastfloodeeper with maximum depth 150m.
- The coarse and fine‐grained mixed sediment is mainly distributed in the western part. The small scale mud patches are situated in the southwest off Jeju Island.
이론/모형
- The sand fraction was analyzed by graded sieving and the silt and clay fraction by pipette techniques. Organic carbon and nitrogen contents in the sediment were analyzed using a CHN Analyzer following the method of Byers et al. (1987). The clay fraction(<2㎛) was smeared on glass and air dried (Gibbs, 1965).
- Sediment accumulation rates were determined from 210Pbex by subtracting the supported levels of 210Pb activity from the total 210Pb measured. The 210Pb supported activity was determined in a few section core samples using the 222Rn emanation method (Lucas, 1975; Nittrouer et al., 1979). The amount of excess 210Pb in samples was calculated by extracting the background 226Ra activity from the total 210Pb activity.
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