关键词: 碳酸盐沉积物, 碳酸盐岩, 下第三系沙河街组, 陆源碎屑岩, 混合岩, 渤海海域, 硅质碎屑, 渤海地区, 沉积模式, 沉积环境

Abstract: This paper describes that the lacustrine carbonate of lower Tertiary Shahejie Formation in Bohai Bay is mostly terrigenous elastics-carbonate mixture rock. There is a seris of transition rocks between the terrigenous clastic rock and carbonate. The nomenclature of these rocks is tabulated tentatively.In Bohai Bay the small limited areas of lacustrine carbonate deposition are surrounded by large areas of the terrigenous clastic depositions during lower Tertiary. The terrigenous clastic-carbonate mix is more easily formed in lacustrine setting compared with the shelf of shallow sea. Three kinds of this mixture rock profile are discovered in Bohai Bay. According to the profiles three mixing patterns are put forward and the sedimentary model of terrigenous clasticcarbonate mix is illustrated.