摘要
前人在黄土—古土壤地层的14C年代学研究中,探讨了不同测年物质的可靠性,但不同物质组分获得的年代差异较大,这是由于选用的样品不符合定年条件,所以选择可靠的样品组分和有效的前处理方法显得尤为重要。对关中地区2万年以来黄土序列中有机质、花粉浓缩物和蜗牛化石进行了AMS14C年代学研究。运用现生蜗牛壳体的AMS14C测定来校正化石蜗牛的年龄,结合剖面中孢粉浓缩物、土壤有机质的AMS14C年代学对比研究,发现蜗牛化石壳体的文石可以提供较可靠的年代数据,为14C测年的可靠性研究提供了一种可能的途径。
Reliable radiocarbon dating of Loess-paleosol sequence is not easy, The discrepency of dating resuhs occurred in the previous work because of different dating materials and the laoking of powerful pretreatment. Here, we tested the feasibility of dating terrestrial mollusks fossil shells from the Loess Plateau, calibrated by the modem snail shell. Then; we compare the calibrated fossil shell results with the datings of the soil humin fraction and concentrated pollen in order to evaluate the reliability of the dating terrestrial mollusks fossil shells. If the fossil shell contains only aragonite form and their shell structure is examined by using X-ray diffraction, we shall be able to achieve reliable dating. Our results indicate that terrestrial shells are potentially useful as dating material.
出处
《地球科学进展》
CAS
CSCD
北大核心
2008年第9期959-964,共6页
Advances in Earth Science
基金
国家自然科学基金面上项目“陕西丹江上游地区1万年以来环境变迁和历史文化兴衰”(编号:40773079606)
中国科学院地球环境研究所知识创新工程领域前沿项目“5000年来气候突变对中国古文明交替影响”(编号:54LYQY0609909)
黄土与第四纪地质国家重点实验室开放基金项目“气候变迁对关中地区龙山文化、夏商朝代更迭的影响”(编号:SKLLQG07010)资助
