辽河三角洲LZK03孔全新世环境演变
Holocene environmental changes revealed by Core LZK03 in the Li-aohe River Delta
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摘要: 根据辽河三角洲LZK03孔岩心的地层、孢粉、14C测年及粒度分析结果，重建了该孔全新世以来的沉积环境演变历史，划分了4个时期：①湖沼期，地层埋深22.70~18.35m，晚更新世晚期约8000cal BP，起始时间早于全新世底界年龄，一直持续到全新世海侵到达该地区；②海侵期，18.35~13.55m，8000~3000cal BP，全新世海侵（辽东湾命名为盘山海侵）于8000cal BP到达该地区，湖沼发育结束，随着海侵向陆扩展，形成了海相潮坪沉积；③海退期，13.55~7.50m，约3000cal BP开始海退，河流携带的泥砂成为主要物源；④盐沼期，7.50~0m，500cal BP时海水已退至LZK03孔向海一侧，经常暴露于地表的氧化环境使盐沼沉积呈黄棕色，被高潮海水淹浸的时间减少。Abstract: In order to understand the coastal geoenvironmental changes in Holocene, the authors took a rotary-drilling core LZK03 in the Liao River Delta to conduct research work. Based on multidisciplinary approaches including stratigraphic logging, pollen analysis, 14C dating and grain size analysis, the authors studied the Holocene sedimentary evolution of the core sediments. As a result, four geological periods were recognized as follows: ①Lacustrine stage, buried at the depth of 22.70~18.35m, which started its activity earlier than the age of Holocene lower boundary and continued until Holocene transgression in the area; ②Transgression stage, buried at the depth of 18.35~13.55m, locally named Panshan Transgression, which arrived in the area around 8ka cal BP and caused the end of the previous stage and formed tidal flat deposits when the transgression further intruded inland. ③Regression Stage, 13.55~7.50m, which started its activity around 3ka cal BP and then rivers produced major sediments in the area. ④Salt marsh stage, buried 7.5~0m in depth and lasting from about 500cal BP to the present, during which the sea has retreated seaward from the core site. Consequently, due to less marine inundation and frequent exposure, the oxidation environment colored the surface sediments yellow brown.
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Key words:
- Liaohe River Delta /
- Holocene /
- environmental changess
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