Mineralogical evidences and significance of transgression event in the Cretaceous basins of eastern Heilongjiang Province, China.

The evidences of marine fossils show that multiple different scales of transgression events have occurred in the Cretaceous basins of eastern Heilongjiang Province and marine interlayers of various thicknesses existed in Lata Cretaceous strata. According to further comparative study based on microscope observation, the SEM and the spectrum characteristics of chemical composition all proved that the glauconite, authigenic monazite and framboid pyrite in Cretaceous sandstones have similar characteristics to marine facies. Thus, it proiveds mineralogical evidence to transgression event in the Cretaceous basins of eastern Heilongjiang Province, and indicate that not only those marine fossils containing stratum were influenced by transgression, but also these authigenic minerals containing stratums were influenced.