The sediments sequence and environmental oscillation of the core XH-1 in Subei Basin since late Cenozoic
兴化XH-1孔记录的苏北盆地晚新生代沉积体系及环境变化过程

Based on paleomagnetism dating and the grain size of sediments, as well as the paleolitho facies analyzing like mineral composition, deposit structure and sediments assembly, we identified 8 sedimentary facies and 19 subfacies of the core XH-1 in Xinghua, Subei Basin. These facies show that the basin had come through four specific intervals as basin subside, construct lake, broad lake and shoal land 3.2 Ma BP. The changes of topography and the drainage system well recorded the two structure movements during the 2.25-2.10 Ma BP and 1.90-1.72 Ma BP. During and after the Kunhuang Movement 0.99 Ma BP, the sediments sequences varied abruptly and confirmed the transformation of the East Asian Monsoon during that time. Comparing the changes of topography, climate and the drainage system of the basin, we try to hold the clue of the coupling of the basin evolvement and the uplift of the Tibetan Plateau.