Timing of Holocene sea-level highstands by mass spectro-metric U-series ages of a coral reef from Leizhou Peninsula, South China Sea  

作　　者：ZHAO Jianxin & YU KefuDepartment of Earth Sciences, University of Queensland, Brisbane, Qld 4072, Australia (e-mail: [e-mail]) South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 501301, China (e-mail: kefuyu@scsi 

出　　处：《Chinese Science Bulletin》2002年第4期348-352,共5页

基　　金：This work wassupported by Australian Kesearch Council, University of Queensland and the National Natural Science Foundation of China (Grant No. 49902014).

摘　　要：Systematic mass spectrometric 230Th ages are reported for a Ponies coral reef terrace from Dengloujiao, Leizhou Peninsula, South China Sea. Seven episodes of coral growth were recognized in this terrace: 7125±96, 6764±29, 5826±37, 5006±54, 2543±24, 1915±15, and 1513±22 calendar years before present (cal. aBP). 50% of the coral age popula-tion fall between 7200 and 6600 cal. aBP, marking post-glacial stabilization of global sea level. Considering the facts that (i) Dengloujiao reef flat was measured at 1.6-2.5 m above modern tidal datum plane; (ii) modern Parties corals in the South China Sea are living at least ~1 m below the modern tidal datum plane; (iii) the top 20-30 cm of the reef was eroded; and (iv) crustal subsidence in the region since mid-Holocene was negligible, we conclude that the above age groups record at least two major periods (7200-5000 and 2500-1500 cal. aBP) of high sea-level at least 2.9-3.8 m above the present-day level.Systematic mass spectrometric 230Th ages are reported for aPorites coral reef terrace from Dengloujiao, Leizhou Peninsula, South China Sea. Seven episodes of coral growth were recognized in this terrace: 7125±96, 6764±29, 5826±37, 5006±54, 2543±24,1915±15, and 1513±22 calendar years before present (cal. aBP). 50% of the coral age population fall between 7200 and 6600 cal. aBP, marking post-glacial stabilization of global sea level. Considering the facts that (i) Dengloujiao reef flat was measured at 1.6–2.5 m above modern tidal datum plane; (ii) modernPorites corals in the South China Sea are living at least ～1 m below the modern tidal datum plane; (iii) the top 20–30 cm of the reef was eroded; and (iv) crustal subsidence in the region since mid-Holocene was negligible, we conclude that the above age groups record at least two major periods (7200–5000 and 2500–1500 cal. aBP) of high sea-level at least 2.9–3.8 m above the present-day level.

关 键 词：CORAL South China SEA U-SERIES DATING SEA level Holo-cene. 

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