河北省雄县牛驼镇地热田第四纪古土壤与古地理环境

本文根据雄县地热田钻孔的古土壤、孢粉分析和地层层序揭示第四纪以来该区土壤层及淋溶淀积作用可划分二大带。０～４２０ｍ：从上到下土壤颜色加深，淋溶淀积加强，出现团块状钙质，古气候由老至新从温湿转化为现代干冷；４２０～８００ｍ：淋溶淀积作用较强烈，上部地层显示过湿的气候条件，反映古气候从干热向温湿转变。第四纪以来植被发展曾经历了４个大的阶段，冷暖干湿气候交替有１６次明显变化。

The Ancient Soil and Palaeogeographic Environment of Niutuozhen Ge othermal Field,Hebei Province in Quaternary Period

According to the study on ancient soil,sporopollenan alysis,stratigrahic succession,and palaeomagnetic dating of the drill in Xiongx ian Geothermal field,Hebei province,the authors have discussed the palaeoclimate evolution in this area during Quaternary period.It is considered that during Qu aternary period the soil layers can be divided in two large zones,the palaeovege tation development had gone through four stages,and the distinct climate change of cold-warm-dry-wet had had sixteen times.