青岛港湾海岸区第四纪地下卤水生存环境与富集条件

THE FORMING STORING ENVIRONMENT AND ENRICHMENT CONDITIONS OF QUATERNARY UNDERGROUND BRINE IN THE EMBAYED COAST OF QINGDAO

青岛港湾海岸区发现可利用卤水资源是中国北方沿海第四纪滨海相地下卤水研究的又一次重要进展。青岛港湾海岸区只有全新世海侵期，具备成卤古海水来源。虽然海岸平原狭小，第四系沉积层浅薄，却有封闭环境优良的湾中湾和堰坝式沉积盆地提供聚卤场所。又有滨海第四纪沉积盆地地质基础以及入海径流贫乏的水文条件，为地下卤水形成和富集创造了有利环境。港湾海岸区海岸地貌特点控制了卤水分布区呈斑块状散布，局部岸段可形成小型矿带。青岛胶州湾沿岸含卤岩系结构特征在中国北方沿海具有典型性，故命名为“胶州湾型”

The discovery of useful brine resources in the embayed coastal zone of Qingdao is an important result of studying potential underground brine resources in Quaternary littoral facies in northern China coast.There was only Holocene transgression in this area that could provide seawater to form brine.In spite of the narrow littoral plain and shallow and thin Quaternary sedimentary strata in the area,there are good enclosed sedimentary basins with bay in bays and weir dams which are favourable for gathering brine.Geologic structures of the littoral Quaternary sedimentary basins and hydrologic conditions(deficient in runoffs)also create favourable environments for the formation of underground brine. The geomorphic features of embayed coast control the distribution of brine which scattters spottily and forms small scale mineral zones in some parts.The brine aquifer series formed under Quaternary littoral plain sedimentary and hydrogeologic circumstances are usually single phreatic ones.Part of thick deposit areas consist of phreatic and poor confined aquifers and sometimes there can be brine aquifers interbedded with saline water near the river mouth.The basement of the brine ore deposits is Mesozoic rock formations.Underground brine is scattered almost all over the littoral plain,and narrow saline water belt is distributed beyond the brine zone only in some parts of the plain.The structure features of brine aquifer series along the Jiaozhou Bay coast are typical of those in northern China coast and we name it“Jiaozhou Bay Type”.Its features are different from those of other brine aquifer series such as“Laizhou Bay Type”and“Bohai Bay Type” in the littoral plain of the Bohai Sea.