【摘要】 综合分析地震、钻井、露头及分析化验资料表明,大杨树盆地中生界龙江组、九峰山组、甘河组地层主要由火山熔岩、火山碎屑岩、砂砾岩、泥岩、油页岩及煤层组成,根据龙江组、九峰组和甘河组的沉积相特征及其分布规律,总结了相应的沉积模式.其岩相类型可归纳为火山溢流相、火山爆发相、冲积相和湖沼相,以及其间的过渡类型.龙江组、九峰山组、甘河组相带分布具有相似性,盆地内各拗陷的西部以溢流相的火山熔岩和爆发相的火山碎屑岩为主,东部以爆发相的火山碎屑岩和冲积相的砾岩、砂岩及泥质岩为主,中部为爆发相的火山碎屑岩和湖沼相的砂、泥岩及煤层.九峰山组冲积相和湖沼相占优势.甘河组以溢流相和爆发相为主.由于不同时期火山活动强度和湖盆发育程度的差异,导致沉积模式有所差别.更多还原

【Abstract】 Mesozic of Dayangshu Basin can be divided into formations of Longjiang,Jiufengshan and Ganhe,which consist mainly of rocks of volcanic lava,volcanic clastic rock,conglomerate,sandstone,mudstone,shale,amd seam.The lithofacies of volcanic overflow,volcanic eruption,alluvium,lacustrine and their transitional types recognized in Mesozic Dayangshu Basin.There are similarities in the lithofacies distribution,the ithofacies of volcanic overflow and volcanic eruption distributed in west part,the lithofacies of volcanic eruption and alluvium distributed in east part,and the lithofacies of volcanic eruption and lacustrine predominated in middle part.Jiufengshan Formation is the major alluvium and lacustrine lithofacies,and Ganhe Formation is the major volcanic overflow and eruption lithofacies.As a result of the differential volcanic activity intensity and lake scale,the depositional models vary a lot.更多还原