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学科主题: Geography, Physical; Geosciences, Multidisciplinary
题名: High-precision TIMS U-series and AMS C-14 dating of a coral reef lagoon sediment core from southern South China Sea
作者: Yu, KF ; Zhao, JX ; Wang, PX ; Shi, Q ; Meng, QS ; Collerson, KD ; Liu, TS
通讯作者: kefuyu@sesio.ac.cn ; pxwang@online.sh.cn ; shiqi@scsio.ac.cn ; k.collerson@uq.edu.au ; tsliu@public.bta.net.cn
刊名: QUATERNARY SCIENCE REVIEWS
发表日期: 2006
卷: 25, 期:17-18, 页:2420-2430
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510301, Peoples R China; Univ Queensland, CMM, Radiogen Isotope Lab, Brisbane, Qld 4072, Australia; Tongji Univ, Lab Marine Geol, Shanghai 200092, Peoples R China; Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China; Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
项目归属: 海洋地质
摘要: Accurate dating of lagoon sediments has been a difficult problem, although lagoon profiles, usually with high deposition rates, have a great potential for high-resolution climate reconstruction. We report 26 high-precision TIMS U-series dates (on 25 coral branches) and five AMS C-14 dates (on foraminifera) for a 15.4-m long lagoon core from Yongshu Reef, Nansha area, southern South China Sea. All the dates are in the correct stratigraphical sequence, providing the best chronology so far reported for lagoon deposits. The results reveal a similar to 4000-a continuous depositional history, with sedimentation rates varying from 0.8 to 24.6 mm a(-1), with an average of 3.85 mm a(-1), which corresponds to an average net carbonate accumulation rate of similar to 2700 g CaCO3 m(-2) a(-1), significantly higher than the mean value (800 +/- 400 g CaCO3 m(-2) a(-1)) used for lagoons in general in previous studies of global carbonate budget. Episodes of accelerated depositions within the last 1000 years correlate well with strong storm events identified by U-series dates of storm-transported coral blocks in the area. However, in the longer term, the sedimentation rates during the past 1000 years were much higher than earlier on, probably due to more vigorous wave-reef interaction as a result of relative sea-level fall since 500 AD and expansion of reef flat area, supplying more sediments. The coral TIMS U-series ages and foraminifera AMS 14C dates reveal intriguing apparent "radiocarbon reservoir ages" (R) from 572 to 1052 years, which are much higher than global mean values of similar to 400 years. (c) 2006 Elsevier Ltd. All rights reserved.
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WOS记录号: WOS:000240819000025
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4398
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Yu, KF; Zhao, JX; Wang, PX; Shi, Q; Meng, QS; Collerson, KD; Liu, TS.High-precision TIMS U-series and AMS C-14 dating of a coral reef lagoon sediment core from southern South China Sea,QUATERNARY SCIENCE REVIEWS,2006,25(17-18):2420-2430
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