摘要
区内更新世古河道变迁,具有暖期向南摆动,冷期向北摆动的规律。一、三期古河道暖期向南摆,河床中沉积的砂层形成了含水层,其间所夹持的隔水层(粘土、亚粘土)是二期古河道冷期向北摆动时的边滩或心滩沉积,从而形成了含水层与隔水层。无论是冷期或暖期的古河道都形成各自的含水砂层及隔水牯土、亚粘土层。对暖期形成含水层,冷期形成隔水层的看法,笔者认为值得商榷。
Pleistocene channels in Shanghai area were characterized by southward and northwardshifting respectively in warm and cold periods,during either of which aquifers of sandand aquifuges of clay and loam were formed.In the first and third warm periods the channels swayed southward,turning their sedimentary sand into the aquifers,while the aquifuges between were just sediments ofconcave flood plains or river sand bars formed by northward migration of the channelsin the second cold period,It is worth arguing that aquifers were formed during warm period,while aquifugesduring cold period.
出处
《上海地质》
1992年第2期15-23,35,共9页
关键词
含水层
古河道
构造运动
上海
aquifer
aquifuge
tectonics
migration of channel
