碩士 / 國立中山大學 / 海洋科學系研究所 / 104 / This study aims to understand the distributions and characteristics of trace metals in sediments around submarine hydrothermal vents off Kueishan Island, northeastern Taiwan. In this study, surface sediments and sediment cores were collected from the study area during May - September of 2009 and June of 2014, and the concentrations of trace metals were determined by inductively coupled plasma-optical emission spectrometry (ICP-OES).
The results showed that the fine particles(mud, clay) and total organic carbon(TOC) of surface sediments were significantly lower at stations around the hydrothermal vents than those stations away from the vents. High total sulfur (TS) contents (63.2-78.1%) of surface sediments occurred at nearby stations of vents, presumably caused by the influence of hydrothermal activitiy. Whereas, much lower TS concentrations (0.0-17.6%) were detected at the stations far away from vents , indicating little influence of hydrothermal activitiy.
Total concentrations of trace metals in surface sediments were lower in H1-1-H2-3 stations than in T1-1-St3 stations, determined largely form the effects of particles size and TOC. The Al / (Al + Fe + Mn) ratio increased generally with distance away from the hydrothermal vents , which was inversely related to the variations of TS and Fe/Al ratio. Meanwhile, the Fe/Mn ratio decreased with distance away from hydrothermal vents , resulted appareutly from the decrease of Fe in sediments with distance. Enrichment factors of the trace metals were elevated (>1) in these stations influeuced significantly by hydrothermal activitiy.
Correlations were significantly positive between TS content and iron, and significantly negative between TS content and Al / (Al + Fe + Mn) ratio in cores collected from nearby vents. The TS concentration in Ks2 increased in 1950-1956, 1968-1970, 1982-1987,1990-1992 and 2004-2005, and decreased in 1967-1968, 1988-1990. and 1994-1995. The temporal variation of TS concentration in Ks3 and S2 was fairly identical with that of Ks2. The distribution of iron and manganese concentrations in different years also has similar condition with sulfur. The emission strength was apparently reflected from the temporal variation of emission indices.
| Identifer | oai:union.ndltd.org:TW/104NSYS5276014 |
| Date | January 2016 |
| Creators | Hsiang-yi Yeh, 葉相逸 |
| Contributors | Jia-Jang Hung, 洪佳章 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 112 |
Page generated in 0.0019 seconds