SCSIO OpenIR  > 中科院边缘海地质重点实验室
delta O-18, Sr/Ca and Mg/Ca records of Porites lutea corals from Leizhou Peninsula, northern South China Sea, and their applicability as paleoclimatic indicators
Yu, KF; Zhao, JX; Wei, GJ; Cheng, XR; Chen, TG; Felis, T; Wang, PX; Liu, TS; kyu@earth.uq.edu.au; j.zhao@uq.edu.au; gjwei@gig.ac.cn; xrchengk@online.sh.cn; kefuyu@scsio.ac.cn; tfelis@allgeo.uni-bremen.de; pxwang@online.sh.cn; tsliu@public.bta.net.cn
2005
发表期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
卷号218期号:40545页码:57-73
摘要Combined seasonal to monthly resolution coral skeletal delta(18)O, Sr/Ca, and Mg/Ca records are reported for one modem and two late Holocene Porites lutea corals from a fringing reef at Leizhou Peninsula, the northern coast of the South China Sea (SCS). All the profiles for the period 1989-2000 reveal annual cycles well correlated with instrumental sea surface temperatures (SST), and display broad peaks in summer and narrow troughs in winter, reflecting seasonal growth rate variations. Calibration against instrumental SST yields the following equations: delta(18)O=-0.174(+/- 0.010)xSST(degrees C)-1.02(+/- 0.27) (MSWD=5.8), Sr/Ca-(mmol/mol)=-0.0424(+/- 0.0031)xSST(degrees C)+9.836(+/- 0.082) (MSWD=8.6), and Mg/Ca-(mmol/mol)=0.110(+/- 0.009)XSST(degrees C)+ 1.32(+/- 0.23) (MSWD=55). The scatter in the Mg/Ca-SST relationship is much larger than analytical uncertainties can account for, suggesting the presence of SST-unrelated components in the Mg/Ca variation. Calculated Sr/Ca-SST values for two later Holocene Porites lutea samples (U-series ages similar to 541 BC and similar to 487 AD, respectively) from the same reef suggest that SST in the SCS at similar to 541 BC was nearly as warm as in the 1990s (the warmest decade of the last century), but at similar to 487 AD, it was significantly cooler. This observation is consistent with climatic data reported in Chinese historic documents, confirming that the Sr/Ca-SST relationship is a reliable thermometer. Removing the SST component in the delta(18)O variation based on calculated Sr/Ca-SST values, the residual delta(18)O reflects the deviation of the Holocene seawater delta(18)O from the modem value, which is also a measure of the Holocene sea surface salinity (SSS) or the summer monsoon moisture level in mainland China. Such residual delta(18)O was close to zero at similar to 541 BC and -0.3 parts per thousand at similar to 487 AD, suggesting that it was as wet as in the 1990s at similar to 541 BC but significantly drier at similar to 487 AD in mainland China, which are also consistent with independent historic records. Calculated Mg/Ca-SST values for the two late Holocene corals are significantly lower than the Sr/Ca-SST values and are also in conflict with Chinese historic records, suggesting that coral Mg/Ca is not reliable proxy for SST. At comparable Sr/Ca ranges, fossil corals always display negative Mg/Ca offsets if compared with the modem coral of the same site. We interpret this observation as due to preferential loss of Mg during meteoric dissolution of cryptic Mg-calcite-bearing microbialites in the exposed fossil corals. Microbialites (MgO up to 17%, Sr only 100-300 ppm) are ubiquitous during reef-building processes and their presence in only a trace amount will have a significant impact on coral Mg/Ca ratios without detectable influence on coral Sr/Ca ratios. (c) 2004 Elsevier B.V. All rights reserved.
部门归属Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510301, Peoples R China; Univ Queensland, ACQUIRE, Brisbane, Qld 4072, Australia; Tongji Univ, Lab Marine Geol, Shanghai 200092, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China; Univ Bremen, DFG, Res Ctr Ocean Margins, D-28359 Bremen, Germany; Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
关键词o Isotopes Sr/ca Mg/ca Sst Porites Lutea Microbialite South China Sea
学科领域Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
收录类别sci
资助项目海洋地质
WOS记录号WOS:000227654100003
引用统计
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4876
专题中科院边缘海地质重点实验室
通讯作者kyu@earth.uq.edu.au; j.zhao@uq.edu.au; gjwei@gig.ac.cn; xrchengk@online.sh.cn; kefuyu@scsio.ac.cn; tfelis@allgeo.uni-bremen.de; pxwang@online.sh.cn; tsliu@public.bta.net.cn
推荐引用方式
GB/T 7714
Yu, KF,Zhao, JX,Wei, GJ,et al. delta O-18, Sr/Ca and Mg/Ca records of Porites lutea corals from Leizhou Peninsula, northern South China Sea, and their applicability as paleoclimatic indicators[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2005,218(40545):57-73.
APA Yu, KF.,Zhao, JX.,Wei, GJ.,Cheng, XR.,Chen, TG.,...&tsliu@public.bta.net.cn.(2005).delta O-18, Sr/Ca and Mg/Ca records of Porites lutea corals from Leizhou Peninsula, northern South China Sea, and their applicability as paleoclimatic indicators.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,218(40545),57-73.
MLA Yu, KF,et al."delta O-18, Sr/Ca and Mg/Ca records of Porites lutea corals from Leizhou Peninsula, northern South China Sea, and their applicability as paleoclimatic indicators".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 218.40545(2005):57-73.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。