THE STRUCTURAL ANALYSIS AND CORRELATION OF SEDIMENTARY SECTIONS OF YIXIAN FORMATION IN WESTERN LIAONING PROVINCE

Arguments have long existed in the analysis and correlation of the sedimentary environment between Jinlingsi-Yangshan and Fuxin-Yixian basins in Western Liaoning Province. The structural analysis of sedimentary sections of Yixian formation in the two basins not only reveals the features of sedimentary facies, but also provides evidences for the correlation of the sedimentary facies. The sedimentary facies of Sihetun area may be divided into alluvial-fluvial, shore-lacustrine, semi-deep and deep lacustrine; while those in Yixian area can be classified into alluvial-fluvial, fluvial, shore-lacuatrine and lacustrine facies. Because of the differences in sedimentary environment, the same sedimentary facies display generality and particularity. The sedimentary facies of Jianshangou bed and lower strata in Sihetun area can be correlated with those of Zhuanchengzi bed and lower strata in Yixian area. The occurrence of variegated polymictic conglomerate sediment, mud cracks, gypsum strata and so on can provide evidences for aridity climate in Western Liaoning.