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The Hebei Plain is located in the northern part of the Great North ChinaPlain,bounded on the west by the Taihang Mis.,and facing the Bobai Sea onthe east.It is a structural subsiding zone since the Meso-Cenozoic.The Quater-nary system was deposited continuously over the Tertiary.The upper part ofthe Neogene system is a series of lacustrine sediments consisting of alternatedmudstone and sandstone in brownish-red,purple,grayish green,and brownish-yellow colours.The Quaternarys ystem is composed of alternated clayey soil colouredfrom gray to yellow,brown,and brownish red to purple(see Fig.1).Accordingto the data obtained in the prospecting of groundwater in the Hebei Plain sincerecent years,more than 40 boreholes have revealed volcanic deposits in the looseQuaternary sediments,distributed mainly in the surrounding of the Cangzhou cityand eastwards to the coastal area,also scattered sparsely in Hengshui,Shenxian,Jinxian,Shulu and Feixiang counties.The multilayered volcanic deposits aregenerally featured by
The Hebei Plain is located in the northern part of the Great North China Plain, bounded on the west by the Taihang Mis., And facing the Bobai Sea on the east. It is a structural subsiding zone since the Meso-Cenozoic.The Quater-nary system was deposited continuously over the Tertiary. upper part of the Neogene system is a series of lacustrine sediments consisting of alternated mortar and sandstone in brownish-red, purple, grayish green, and brownish-yellow colors. The Quaternarys ystem is composed of alternated clayey soil colored from gray to yellow, brown, and brownish red to purple (see Fig.1). Accordingto the data obtained in the prospecting of groundwater in the Hebei Plain sincerecent years, more than 40 boreholes have revealed volcanic deposits in the looseQuaternary sediments, distributed mainly in the surrounding of the Cangzhou cityand eastwards to the coastal area, also scattered sparsely in Hengshui, Shenxian, Jinxian, Shulu and Feixiang counties. The multilayered volcanic deposits aregene rally featured by