关键词: 中国南海, 大陆架, 更新世晚期, 磁化率, 古环境

Abstract: AS the key area of the interaction between land and sea, continental shelf is important for the tectonic evolution of continent, sea-land change, sea level eustacy and climate change. However due to the limits of different methods, the understanding of the chronology and potential geological information of the sediments on the continental shelf is not enough. To better constrain the chronology of the Late Pleistocene continental shelf sediments, in northern South China Sea, the comparison between magnetic susceptibility and Marine Oxygen Isotope based on microscopic paleonotological fossils was studied on the Core DG. Additionally, the results of sediments color and pollens were used to study the paleoclimatic implications. The results suggest that the chronology of the sediments of HoleCore DG can be constrained from MIS 1 to MIS 9, with the age of the bottom is about 300 ka. The relative high and low values of magnetic susceptibility correspond to interglacial and glacial periods, respectively. As a relative dating method, the comparison between magnetic susceptibility and Marine Oxygen Isotope is applicative and reliable in constraining the chronology of the Late Pleistocene continental shelf sediments, in northern South China Sea, thus providing a new reference for studying and correlating the continental shelf sediments.

Key words: South China Sea, continental shelf, Late Pleistoncene, Magnetic susceptibility, Paleoclimate