Reconstruction of storm/tsunami records over the last 4000 years using transported coral blocks and lagoon sediments in the southern South China Sea

doi:10.1016/j.quaint.2008.05.004

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 会议论文

	Reconstruction of storm/tsunami records over the last 4000 years using transported coral blocks and lagoon sediments in the southern South China Sea
	Yu, Ke-Fu 1,3; Zhao, Jian-Xin 1,3; Shi, Qi 3; Meng, Qing-Shan 2
	2009
会议日期	SEP 25-28, 2006
会议地点	Gulf Coast Assoc Geol Soc, Lafayette, LA
DOI	10.1016/j.quaint.2008.05.004
页码	128-137
英文摘要	Large transported coral blocks on reef flats and elevated sedimentation rates in atoll lagoons were demonstrated to be excellent proxies for past strong storms/tsunamis in the southern South China Sea. Here we introduce another important proxy-coarse-fraction contents of lagoon sediments. This proxy is based on the principle that coarse fractions of enclosed lagoon sediments are usually controlled by strong sedimentary dynamics on the surrounding reef flat, and thus increases in the weight percentages of coarse-grained fractions of the lagoon sediments should also reflect strong storm/tsunami events or increases in storminess, with the size of the content peak as the proxy for the degree of storminess. Bearing this in mind, we measured the contents of the > 1 mm grain-size fractions (referred to as "coarse-fraction content") in an undisturbed lagoon core precisely dated to cover the last 4000 years. The decadal-resolution data show a systematic variation, with some peaks strongly correlated with in timing with strong storm/tsunami events dated at AD 1872 +/- 15, 1685 +/- 8 similar to 1680 +/- 6, 1443 +/- 9, 1336 +/- 9, 1210 +/- 5 similar to 1201 +/- 4 and 1064 +/- 30 using wave-transported coral blocks. Using the mean coarsefraction content (9.2%) for the entire core as a reference line, a total of 77 peaks were identified for the past 4000 years. Twenty of these peaks are higher than 23%, the mean value for peaks that are correlated in age with the six strong storm events identified using independently dated coral blocks. Among these >23% peaks, 13 occurred within the last 1000 years. The concentration of contentpeaks in the last millennium could be partially due to higher deposition rates and sampling resolution. Over the last similar to 4000 years there appears to be a weakly increasing trend in coarse-fraction contents towards present time, but this trend is not obvious within the last millennium. This long-term variation may be related to changes in both storminess and reef-lagoon morphology. However, the data do suggest three extremely stormy periods centring around AD similar to 1200, similar to 400 BC and similar to 1200 BC, respectively. Overall, this study demonstrates that combined use of transported coral blocks and coarse-fraction contents of lagoon sediments provides an excellent means for comprehensive reconstruction of past storm/tsunami activity. (c) 2008 Elsevier Ltd and INQUA. All rights reserved.
会议录	QUATERNARY INTERNATIONAL
会议录出版者	PERGAMON-ELSEVIER SCIENCE LTD
会议录出版地	OXFORD
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS记录号	WOS:000263692000012
内容类型	会议论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4546]
专题	岩土力学所知识全产出_会议论文
作者单位	1.Univ Queensland, Radiogenic Isotope Lab; 2.Chinese Acad Sci, Inst Rock & Soil Mech ; 3.Chinese Acad Sci, S China Sea Inst Oceanol
推荐引用方式 GB/T 7714	Yu, Ke-Fu,Zhao, Jian-Xin,Shi, Qi,et al. Reconstruction of storm/tsunami records over the last 4000 years using transported coral blocks and lagoon sediments in the southern South China Sea[C]. 见:. Gulf Coast Assoc Geol Soc, Lafayette, LA. SEP 25-28, 2006.