豫西渑池盆地湖泊沉积特征与古环境

对渑池盆地池底村古湖泊沉积剖面进行连续采样,在粒度组成和有机碳含量分析的基础上,结合¹⁴C年代测定(校正为日历年龄),重建了盆地区末次冰盛期以来的气候环境演化进程:19543~9240cal.aB.P.,气候比较干燥,古湖泊尚未形成;9240~8039cal.aB.P.,气候由干冷向暖湿化方向转变,古湖泊开始形成;8039~3473cal.aB.P.期间,气候温暖湿润,湖泊水位最高;3439~2931cal.aB.P.期间,气候波动剧烈,总体上气候较前一段干旱,湖泊水位下降;2931~2423cal.aB.P.期间,气候干旱,古湖泊干涸。盆地区的人类文化演进对气候环境变化的响应十分明显,二者之间存在一定的耦合关系。

Sedimentary Characteristics of Lacustrine Sediment Profile and Paleoenvironment in Mianchi Basin,Western Henan Province

In this paper, continuous sampling, grain size and total organic content(TOC) analysis have been done with the paleolacustrine sediment profile in Chidi Village, Mianchi Basin, combining with ¹⁴C dating and calibrating, the paleoenvironment in Mianchi Basin since the Last Glacial Maximum was reconstructed as follow: (1) During 19 543-9 240 cal. a B.P., the climate was dry and the lake was not formed; (2) During 9 240- 8 039 cal.a B.P., the climate turned to be warmer and humid, paleolake started to form;(3) During 8 039- 3 473 cal.aB.P., it was warm and humid in Lake Basin, and water level of the paleolake was the highest;(4) During 3 439-2 931 cal.a B.P., the climate change violently, in the whole period it was less warm and humid than before, water level of the paleolake decreased.(5) During 2 931-2 423 cal.a B.P., it was a dry and cold period with lower temperature and less precipitation, the paleolake gradually dried up. The evolution of human cultural in Mianchi Basin responded to climate change obviously, and was in correlation with the environment change.