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学科主题: Geochemistry & Geophysics
题名: High-precision U-238-U-234-Th-230 disequilibrium dating of the recent past: a review
作者: Zhao, JX ; Yu, KF ; Feng, YX
通讯作者: j.zhao@uq.edu.au
关键词: Uranium-thorium dating ; Coral ; Speleothem ; Mass spectrometry ; Recent past
刊名: QUATERNARY GEOCHRONOLOGY
发表日期: 2009
卷: 4, 期:5, 页:423-433
收录类别: sci
部门归属: [Zhao, Jian-xin; Yu, Ke-fu; Feng, Yue-xing] Univ Queensland, Radiogen Isotope Lab, CMM, Brisbane, Qld 4072, Australia; [Yu, Ke-fu] Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
项目归属: 海洋地质
摘要: Although it was demonstrated 20 years ago that mass spectrometric U-Th methods are capable of high-precision dating of young corals, the use of this approach to decipher recent environmental, climatic and archaeological records is still restricted and its potential has not yet been widely recognised. U-Th methods are typically used to determine the ages of carbonate materials such as speleothem and coral. Dating young carbonates of this sort is challenging. Their extremely low Th-230 content necessitates stricter instrumental and laboratory conditions than those required for dating older samples. Moreover, analyses must be corrected for the presence of non-radiogenic Th-230, which is proportionally far more significant than in older samples. Nevertheless, 2 sigma precisions of around +/- 1-10 years are readily achievable for pristine coral samples dating from the last 500 years. Although the range of analytical precisions for speleothems may vary more widely depending on U concentrations and levels of non-radiogenic Th-230 correction, published studies reveal 2 sigma precisions of around +/- 10-80 years for typical speleothems. This paper demonstrates how the U-Th method may be applied to establish the causes of recent coral mortality, to determine the recurrence interval of extreme wave events, to investigate earthquake frequency and neotectonic uplift, to reconstruct recent climatic history, and to understand settlement patterns and sociopolitical changes in Polynesia prior to European contact. (C) 2009 Elsevier Ltd. All rights reserved.
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WOS记录号: WOS:000271335200010
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4596
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Zhao, JX; Yu, KF; Feng, YX.High-precision U-238-U-234-Th-230 disequilibrium dating of the recent past: a review,QUATERNARY GEOCHRONOLOGY,2009,4(5):423-433
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