珠江口及南海沉积物碳黑的放射性碳年龄  

Radiocarbon ages of black carbon in sediments from Pearl River estuary and South China Sea

作　　者：孙雪松[1] 宋建中[1] 彭平安[1] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室

出　　处：《地球化学》2008年第1期65-67,共3页Geochimica

基　　金：广东省自然科学基金(06025461);国家自然科学基金(40332019)

摘　　要：放射性碳同位素(14C)是含碳物质年代测定的有效手段,它的半衰期是5730年。研究了珠江口及南海沉积物碳黑的放射性碳年龄,碳黑样品采取化学氧化方法提取,用加速器质谱仪(AMS)测定珠江三角洲沉积柱中碳黑的放射性碳同位素剂量。研究结果表明,位于珠江口的钻孔3的碳黑的14C年龄是倒置的,邻近香港的钻孔30的碳黑14C年龄呈现老-新-老的趋势,而钻孔E2的碳黑的14C年龄则几乎是不变的。碳黑的这种14C年龄的变化趋势与碳黑的来源相关,化石燃料来源的碳黑的增加使得碳黑的14C年龄偏老。Radiocarbon （^14C） with the half-life of 5730 a is a powerful dating methods. Radiocarbon ages of black carbon in sediments from the Pearl River Estuary and South China Sea were studied. The black carbon （BC） was isolated with chemieal oxidation method and the ^14C abundanee of it was determined using acceleratory mass spectrometry. The depth profiles of BC ^14C ages in three cores are different. The age profile in Core 3 is inverted and it is in the pattern of ＂old-new-old＂ in Core 30. In contrast, it is almost no change in Core E2. The variation of profiles may correlate with the changes of BC sources. The increase of BC derived from fossil fuel burning in samplesresults in the older BC ^14C age.

关 键 词：碳黑 加速器质谱仪(AMS) ^14C年龄 化石燃料 

分 类 号：P593[天文地球—地球化学]