运用研制国家铀系年龄一级标准物质的分析测试系统，精确的测定南沙群岛海区诸多柱样的铀含量、沉积物的平均沉积速率，结合相关科学资料综合整理，对比亚南极海等的岩心资料后认为，南沙群岛海域沉积物中自生铀含量（以下简称铀含量）高的层位为冰期，铀含量低的层位为间冰期 Based on the analysis and test system of developing national uranium age-grade standard materials, the uranium content of many samples in the Nansha Islands sea area and the average deposition rate of sediments are accurately determined, and the core data of the Arctic Antarctic Sea It is thought that the horizon with high uranium content (hereinafter referred to as uranium content) in sediments of Nansha Islands is glacial stage, and the horizon with low uranium content is inter-glacial stage