https://scholars.lib.ntu.edu.tw/handle/123456789/45147
標題: | 東南亞河川流域及海洋之碳循環─子計畫三:南中國海河口三角洲及陸棚沉積物之硫酸鹽還原作用與有機碳埋藏(I) | 作者: | 林曉武 | 公開日期: | 2004 | 出版社: | 臺北市:國立臺灣大學海洋研究所 | 摘要: | 珠江是中國大陸重要的河川之一,其亦是南海北部陸棚及陸坡區主要陸源沉 積物來源。故本研究目的是藉由分析珠江外海陸棚及陸沉積物中金屬鋁、鐵、錳、 鋅、銅、鉛、鎘七種元素及有機碳與碳酸鈣含量,探討南海北部海域陸棚及陸坡 地區沉積物之空間分佈變化,並進一步探討影響本研究區域金屬空間分佈變化的 主要控制因子。 研究結果顯示珠江為此區域最主要之陸源沉積物之來源。沉積物金屬與有機 碳之含量皆以珠江口與三角洲處為高值出現之區域,而其他多數陸棚區域則沉積 物金屬與有機碳含量皆偏低,顯示陸源沉積物多未沉降於絕大多數之陸棚上。多 數金屬與有機碳含量自珠江口向南延伸至陸坡區域,顯示珠江正向南傳輸其沉積 物並延伸傳輸到陸坡區域。研究區域沉積物主要來源包括陸源黏土礦物與海源碳 酸鈣殼體。沉積物顆粒大小組成控制了金屬含量的變化。河川沉積物金屬含量異 常偏高可能是受珠江下游區域之城市與工業區污染所導致。Diagenesis 亦是控制 此區域金屬含量變化之主要因素之一。部份沉積物因有機碳含量偏高,故其金屬 含量亦偏高。此研究區域位於東沙群島附近有金屬異常偏高的情況。 Understanding terrigenous organic carbon and other terrigenous material burial in the marine environment is important in evaluating fate of terrigenous material transport to the ocean. Pearl river is a primary source of terrigenous material entering the South China Sea. Very few data is currently available in evaluating fate of terrigenous from the Pearl River to the South China Sea. The purpose of this research is to investigate burial of organic carbon and inorganic metals associate with aluminosilicate in the Pearl River Delta, shelf and slope region. Sediments were collected inside the Pearl River, and in the Delta, shelf and slope region. Organic carbon, carbonate carbon, metals (aluminum, iron, manganese, zinc, copper, lead, cadmium) were determined. The result demonstrated that organic carbon, aluminum silicate and associated metals from the Pearl river are the most important terrigenous materials entering the northern 3 South China Sea. High concentrations of organic carbon, and metals related to aluminosilicate were found in the Pearl River Delta and adjacent shelf region, and rapidly decreased away from the Delta. However, an elongate shape of higher concentrations of organic carbon and metals related to aluminosilicate were found from the delta extending southward to the slope region while other shelf regions showed very low concentrations. Evidently, terrigenous organic carbon and aluminum silicates are actively transported from the Pearl River Delta to the slope. Organic carbon and metals associated with aluminum silicate showed very good linear correlations with respect to the aluminum concentrations, indicating a diluting effect from the coarse-grained quartz sand. The extent of terrigenous materials deposited on the Pearl River Delta and shelf region seemed to be very limited. Most terrigenous materials are likely to deposit on the Delta and shelf only, probably a major fraction of terrigenous materials were actively transported to the slope region. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/14854 | 其他識別: | 922621Z002027 | Rights: | 國立臺灣大學海洋研究所 |
顯示於: | 海洋研究所 |
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922621Z002027.pdf | 192 kB | Adobe PDF | 檢視/開啟 |
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