摘要
本文通过对泥炭中分离出的碱不溶物、胡敏酸、富里酸等有机组分样品及未经组分分离的泥炭原样的^(14)C年龄测定,探讨了泥炭样品^(14)C年龄可靠性问题。初步认为:低灰分、低分解的泥炭,同一层位的各组分样品的^(14)C年龄,具有较明显的一致性,低灰分泥炭碱不溶物的^(14)C年龄,大多偏老于其它组分,表明其年龄是可靠的,但高灰分泥炭的碱不溶物,其年龄往往偏年轻,而胡敏酸组分的年龄则具有相对的可靠性;富里酸是最年轻的不稳定的组分,其^(14)C年龄明显年轻而不可靠,是现代碳污染的主要来源。
In order to make clear the reliability of 14C ages of peat samples, 6 typical sections were selected and 12 groups of peat samples were collected within different distribution regions. By chemical method, alkaline undissolved matter, humic acid, fulvic acid and unseparated original peat were separated from every group, to make up 42 samples of organic constituent. Their 14C ages were respectively dated. Based on this analysis, several view points are proposed:
14C ages are obviously coincident for samples at the same layer or peats with both low ash contents and decompositions.
14C ages of alkaline undissolved matter in low-ash-content peat are older than those of the other constituents, indicating that the ages are reliable. On the contrary, alkaline undissolved matter in high-ash-content peat is normally younger, but the humic acid has a relatively reliable 14C age.
As a main source of modern carbon pollution, fulvic acid is the youngest unstable constituent, and its 14C ages are not old enough to be reliable.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1992年第2期89-97,共9页
Marine Geology & Quaternary Geology
基金
国家自然科学基金
地震基金委员会资助项目
关键词
^14C年龄
泥炭
有机组分
可靠性
14C age organic constituents of peat alkaline undissolved matter humic acid fulvic acid
