摘要
本文根据沼泽剖面的 ^(14)C测年、孢粉分析、粘土矿物X-衍射分析、植物残体鉴定和沉积物化学元素资料,研究了晚更新世末期以来三江平原沼泽发育与古地理环境演变。结果表明,沼泽发生及其发展与古地理环境演变有极其密切的关系。可分为四个时期:晚更新世末期沼泽孕育期,早全新世沼泽萌芽发育期,中全新世沼泽旺盛发育期,晚全新世沼泽继续扩大发育期。距今11000年左右应为本区晚更新世与全新世的分界。腐泥层底是全新统的下界。同江县勤得利农场十九队、抚远县创业队沼泽剖面可作为本区全新世的标准剖面。泥炭积累速率为晚全新世>早全新世>中全新世。
This paper makes a preliminery study of the relationship between mire development and palaeogeographical environment changes since the Late Pleistocene by means of 14C dating, X-ray diffraction of clay mineral, analyses of spore-pollen and plant residual, content and translation and transformation of chemical elements, etc. Close relationship was found between mire development and palaeogeographical environment in the four periods, i.e, the breeding development in late period of the Late Pleistocene (more than 11 000 years B.P.), the germi-nant development in the Early Holocene (11 000-8 000 years B. P.), the vigorous development in the Middle Holocene (8 000-2 500 years B. P.), and the further expanding development in the Late Holocene (2500 years B. P.-0). The demarcation line between the Late Pleistocene and the Holocene is at 11 000 years B. P., and the border of sedimentary layer is the bottom of gyttja. The two bog-sections of 19th team, Qindeli farm and Chuangye team, Fuyuan county can be considered as the standard section of the Holocene in this area. The paper also points out that the largest accumulation rate of peat occurred in the Late Holocene, the smallest one did in the Middle Holocene.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1990年第1期27-38,共12页
Oceanologia Et Limnologia Sinica
