地质通报2016，Vol.35Issue(10)：1692-1704,13.
基于多重地层对比研究还原长江三角洲北翼晚第四纪古环境演变
Reconstruction of the Late Quaternary palaeoenvi-ronment on the north wing of Yangtze River Delta, based on comparative study of the multistratigraphies
摘要
Abstract
A 74m core was obtained from Borehole CSJA3, drilled in Qindong Town, Yancheng City of Jiangsu Province. Multi⁃stratigraphic studies, which included sedimento-, chrono-and biostratigraphy, were carried out for its core sediments. Consequently, three foraminifera assemblages since the Late Quaternary were preliminarily distinguished, which corresponded to‘Zhenjiang Trans⁃gression’,‘Gehu Transgression’and‘Taihu Transgression’, respectively. This correlation confirmed that such three transgressions all occupied the borehole area and the transgressive records were well preserved. Moreover, seven palynological assemblages, revealing variability of the climate and sedimentary environments in the same period, were composed of the following assemblages:(P 8) Cyper⁃us-Graminea assemblage, 0~7.8m, warm and humid, salt marsh to supratidal upwards;(P7) Pinus-Chenopodiaceae-Artemisia assem⁃blage, 7.8~11.0m, cold and dry, fluvial flood plain; (P6) Pinus-Quercus-Gramineae-Chenopodiaceae-Compositae assemblage, 11.0~30.0m, moderate warm and slightly dry, fluvial flood plain upward to intertidal; (P5) Ring algae-Artemisia assemblage, 30.0~37.2m, cold and dry, fluvial flood plain;(P4) Pinus-Compositae assemblage, 37.2~43.55m, warm-cool to cold-dry, intertidal to sub⁃tidal; (P3) Quercus-Pinus-Gramineae assemblage, 43.55~50.0m, warm and humid, intertidal; (P2) Pinus-Quercus-Compositae-Concentricystes aseemblage, 50.0~65.0m, warm-cool to dry, bank-attached bar and fluvial-flood land facies.关键词
晚第四纪/沉积学/年代学/有孔虫组合/孢粉组合/古环境Key words
Late Quaternary/sedimentology/chronology/foraminifera assemblages/pollen assemblages/ancient environment分类
天文与地球科学引用本文复制引用
于俊杰,劳金秀,蒋仁,曾剑威,彭博,马雪,赵玲,杨祝良..基于多重地层对比研究还原长江三角洲北翼晚第四纪古环境演变[J].地质通报,2016,35(10):1692-1704,13.基金项目
中国地质调查局项目 （）
