中文摘要：

通过对海南岛三亚地区铁炉港海湾TLG01钻孔沉积物的AMS 14C和OSL测年,以及对地层岩性特征、亮度、粒度、海生贝壳、有孔虫丰度等进行研究,发现全新世海相层较薄,以砂质潮坪相沉积为主;而下伏晚更新世海相层厚度超过38 m,OSL测年结果显示为MIS-5e及MIS-5d沉积。晚更新世海进―海退系列自下而上依次为砂质潮坪―潮下带―泥质潮坪―砂质潮坪,其中可见较深水的软体动物。MIS-5e细粒的粉砂黏土体积分数先陡增、后缓降,结合粒度及有孔虫丰度、亮度L＊等指标,判断MIS-5e初期为最高海平面时期,水深较大,其后海平面逐渐降低;沉积物中陆源粗砂的体积分数不断增加,显示进入了MIS-5d相对低海面时期。MIS-1及MIS-5沉积物粒度三角图,分别与湛江海岛潮间带及不同深度南海表层沉积物同类沉积环境有较好的对照,指示2类不同水深的海相环境。

英文摘要：

Based on AMS 14 C and optical stimulated luminescence dating of core TLG01 from Tielu Harbor of Sanya in southern Hainan Island, this study comprehensively analyzes lithology, sediment grain size, color index, marine macrofossil and foraminifer indexes. The upper marine deposit belonging to the Holocene is thin that is interpreted as tidal sand flat. Whereas, the lower marine deposits, as thick as 38 m, are dated to MIS 5e and 5d according to optical stimulated luminescence dating. The late Pleistocene transgression-regression sequences are as follows： tidal sand flat-subtidal-tidal mud flat-tidal sand flat. The species of Mollusca living in deep-water condition are identified in late Pleistocene marine layer. The species identification and their related habitats make possible to restore the sedimentary facie. In MIS 5e, the content of silt and clay sharply increased followed by a decrease trend at MIS 5d. Sediment grain size, foraminifera abundance and sediment color index L＊ show that the highest sea level appeared at the beginning of MIS 5e, while from MIS 5e to MIS 5d, the sea level was lowered, accompanied by the increase in terrestrial coarse sand, indicating relative low sea level toward MIS 5d. The triangular plots of interglacial periods MIS 1 and MIS 5 are respectively consistent with modern surface sediments from the island intertidal zone of Zhanjiang and the South China Sea.