Abstract：The analcime dolostone and its rock association were found in Dujiatai reservior of the Member 4 of Paleogene Shahejie Formation in Leijia area of western sag of Liaohe Depression, Bohai Bay Basin. These rocks have complex mineral assemblages and sedimentary structures, and were regarded as argillaceous dolostone and dolomitic mudstone association previously. Through integrated study of petrography,X-ray diffraction whole rock analysis,scanning electron microscope analysis and electron probe analysis, abundant sedimentary analcites in study area are discovered firstly, and are mixed with lamellar argillaceous dolomites, forming analcimite locally. Carbon and oxygen isotope analyses show that their δ13C value are positive while their δ18O value are negative,similar with those of the hydrothermal dolostones reported by domestic and foreign papers. The rare earth element patterns of the analcite dolostones are similar with the alkali basalts in the same layer and the lower Fangshenpao Formation. By synthesis analysis of these results, the formation of the analcite dolostone and the mineral transformation of the basalt in Fangshenpao Formation are closely related with lake floor hydrothermal process, and they form hydrothermal sedimentary rocks by interactions.
Song Bairong,Han Hongdou,Cui Xiangdong et al. Petrogenesis analysis of lacustrine analcite dolostone of the Member 4 of Paleogene Shahejie Formation in Liaohe Depression, Bohai Bay Basin[J]. JOPC, 2015, 17(1): 33-44.
