中-晚全新世高海平面的琼海珊瑚礁记录  

MID-TO LATE-HOLOCENE SEA LEVEL HIGHSTANDS:EVIDENCE FROM FRINGING CORAL REEFS AT QIONGHAI,HAINAN ISLAND

作　　者：时小军[1,2] 余克服[1,3] 陈特固[1] 张江勇[1,2] 赵建新[1,3] 

机构地区：[1]中国科学院边缘海地质重点实验室,中国科学院南海海洋研究所,广州510301 [2]中国科学院研究生院,北京100049 [3]Radiogenic Isotope Laboratory, Center for Microscopy and Microanalysis, the University of Queensland, Qld 4072, Australia

出　　处：《海洋地质与第四纪地质》2008年第5期1-9,共9页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(40572102);中国科学院知识创新工程重要方向性项目(kzcx2-yw-318);国家科技计划课题(2006BAB19B03);ARC课题(DP0773081)

摘　　要：采用精确的高程测量和高精度的TIMS铀系定年方法,对海南岛东部琼海青葛附近低潮时出露的原生死珊瑚和外礁坪上的活微环礁进行调查研究。调查结果表明,青葛附近外礁坪上的微环礁存在狭窄的生长上限(±8cm),位于最低低潮面上,是相当精确的海平面标志物。原生死珊瑚顶面与附近现代活微环礁顶面的高差数据和精确可靠的TIMS铀系年龄数据显示,5500～5200aBP(U/Th年龄,相对于2008年)时海平面至少高出现在(100±8)cm,真实的海平面很可能比现在高2.0～2.2m。总体上,5500～3500aBP期间海平面波动变化,波动幅度约为0.6m,且这种波动与气候波动有较好的对应性。4400～3900aBP期间琼海珊瑚礁的发育缺失很可能与此时的气候干冷有关。Systematic field investigation and elevation survey were carried out on emerged primary dead massive corals and sub-tidal living micro-atolls along the coast of Qingge Township, Qionghai City, Hainan Island. Samples collected from these dead massive corals were also dated by the high-precise TIMS Useries method. The results show that： （1）micro-atolls on the outer reef flat at Qingge are precise sea-level indicators because their surface elevations are confined in a narrow range of only 8 cm below the lowest tidal level; （2） paleo-sea-level, indicated by the elevations （as relative to the mean elevation of living micro- atolls） and U/Th ages of primary dead corals, was at least 1 m higher than the present one during the stage 5 500-5 200 years ago, or more likely to be 2.0-2.2 m above the present; （3） paleo-sea-level, which oscillated by up to 0.6 m during the period of 5 500-3 500 aBP, was coincident with climatic changes on the whole; （4） the conspicuous lack of coral growth 4 400 - 3 900 aBP correlates well with the cold and dry period in south China reflected in speleothem 3180 records from Dongge Cave in Guizhou Province, which coincides with the collapse of the Neolithic Culture of China （NCC）.

关 键 词：珊瑚礁 高海平面 海平面波动 中-晚全新世 琼海市 海南岛 

分 类 号：P736.2[天文地球—海洋地质]