【摘要】 辽东湾盆地古近系沙河街组产有一套分布仅限于深凹陷内的深湖相白云岩,岩性主要为泥-微晶白云岩,物质组分以铁白云石为主,在深湖相暗色泥岩中呈很薄的夹层产出,累计厚度6~10 m,产出位置明显受区域内辽中凹陷西界的北北东向基底断裂控制。通过系统的沉积学、岩石学、矿物学和地球化学特征研究,以及与酒西盆地青西坳陷下沟组热水白云岩成因特征对比,认为发育于旅大地区深凹陷内的沙河街组深湖相白云岩也属于罕见的湖相热水沉积岩。更多还原

【Abstract】 The deep lacustrine facies dolomite exits in the stratum of Paleogene Shahejie Formation in Liaodongwan basin,its distribution is only in the deep sag;the rock characteristic is dolomicrite mainly,and the matter composition gives first place to ankerite.It appears as very infertile interlayers in black mudstone of deep lacustrine facies,and the accumulative thickness is about 6 ~ 10 m.The occurrence location is obviously controlled by the western fracture of Liaozhong sag.Through the systematic study on the sedimentology,petrology,mineralogy,geochemistry and the comparison with genetic characteristics of hydrothermal dolomite in Xiagou Formation of Qingxi sag in Jiuxi basin,the authors think that the deep lacustrine facies dolomite in Shahejie Formation of deep sag developing in the Luda aera also belongs to lacustrine facies hydrothermal sedimentary rock,which has the infrequently especial genetic meaning.更多还原