渤海西北岸曹妃甸地区晚更新世末期以来古环境恢复

通过孢粉和硅藻分析并结合沉积学以及14C测年等资料,重建了渤海湾西北岸曹妃甸地区晚更新世末期以来的古植被、古气候以及古地理等演变过程,细致刻划了渤海湾西北岸海平面变化和海陆变迁史.曹妃甸地区自晚更新世末期以来的古沉积环境经历了冲积平原或滨海平原、河口或近海湖沼环境、三角洲与砂坝-泻湖沉积环境、废弃三角洲与砂坝-泻湖沉积环境等4个阶段.气候和植被在不同阶段也发生了相应的变化.

Restorations of Paleoenvironments in Caofeidian Area Since the Last Stage of the Late Pleistocene Epoch

Based on the analyses of spore pollen and diatom in combination with the sedimentary data and the data of 14 C dating, the paleoenvironments including paleovegetation, paleoclimate and paleogeography since the last stage of the Late Pleistocene Epoch in the studied area were reconstructed The history of sea level changes and the coastal evolutions were detailedly described Four phases of the paleoenviromental evolutions in Caofeidian area have been identified: (1) alluvial plain (at the last stage of the Late Pleistocene Epoch); (2) river mouth and coastal lacustrine or swampy environment (in the Early Holocene Epoch); (3) delta and barrier lagoon environment (in the Middle Holocene Epoch); (4) abandoned delta and barrier lagoon environment (in the Late Holocene Epoch) Corresponding to the different environments, climate changes and vegetation evolutions during the four phases have also been reconstructed