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在1977年一年中,对美国东北部海岸外的乔治滩区的表层沉积物按季节采样与分析,揭示了动态的烃类地球化学规律。陆源成因的烃类似乎处于完全稳定状态,然而,海洋生物成因的烃类沉积后又在表层沉积物中被侵蚀掉,最后再沉积在滩面的粉砂沉积区内。间接证据表明,人为的烃类明显与粉砂-粘土级沉积有关,而在较粗沉积中以陆源植物蜡占优势。研究了用正烷烃奇偶优势指数(OEPI)和总有机碳(TOC)的关系以及总烃(THC)对TOC的关系作为解释手段的意义。最后,就污染物输入本区的问题讨论了动力搬运的意义。
In the 1977 year, seasonal sampling and analysis of surface sediments in the Georgetown area off the northeastern coast of the United States revealed dynamic hydrocarbon geochemical laws. Hydrocarbons of terrigenous origin seem to be in a completely steady state. However, hydrocarbons of marine origin are subsequently eroded in surface sediments and finally deposited in the silt deposition area of the beach surface. Indirect evidence indicates that man-made hydrocarbons are clearly associated with silt-clay grade deposits, whereas terrigenous plant waxes prevail in coarser deposits. The relationship between OCPI and total organic carbon (TOC) as well as the relationship between total hydrocarbon (THC) and TOC was studied as a means of interpretation. Finally, the significance of power handling was discussed with regard to the import of pollutants into the area.