| Determination on ^87Sr/^86Sr ratio and stratigraphic dating of single-grain foraminifera |
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| 作者姓名： | TONG Jinggui LI Shengrong LI Xiannhui LI Qiuli FANG Nianqiao CHU Fengyou CHEN Fukun |
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| 作者单位： | [1]State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences, Beijing 100083, China [2]ey Laboratory of Lithosphere Tectonics and Lithoprobing Techology of Ministry of Education, China University of Geosciences, Beijing 100083, China; [3]Laboratory for Radiogenic Isotope Geochemistry, Institute of Geologyand Geophysics, Chinese Academy of Sciences, Beijing 100029,China [4]Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China |
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| 摘 要： | Information on palaeoocean and palaeoclimate can be recorded in foraminifera, and formation ages of the fo- raminifera are nevertheless essential for such study of pa- laeoenvironment. The growth rate of seamount ferroman- ganese crusts is normally very l…
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| 关 键 词： | 有孔虫 锰铁 锶同位素定年 测定 地层学 |
| 收稿时间： | 2006-03-14 |
| 修稿时间： | 2006-03-142006-04-29 |
Determination on 87Sr/86Sr ratio and stratigraphic dating of single-grain foraminifera |
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| TONG Jinggui LI Shengrong LI Xiannhui LI Qiuli FANG Nianqiao CHU Fengyou CHEN Fukun.Determination on ^87Sr/^86Sr ratio and stratigraphic dating of single-grain foraminifera[J].Chinese Science Bulletin,2006,51(17):2141-2145. |
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| Authors: | Jinggui Tong Shengrong Li Xianghui Li Qiuli Li Nianqiao Fang Fengyou Chu Fukun Chen |
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| Institution: | (1) State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China;(2) Key Laboratory of Lithosphere Tectonics and Lithoprobing Techology of Ministry of Education, China University of Geosciences, Beijing, 100083, China;(3) Laboratory for Radiogenic Isotope Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;(4) Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou, 310012, China |
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| Abstract: | The Sr isotopic composition of foraminifera has been used in studies of chronstratigraphy and sedimentary geochemistry. However,
it is difficult to sample foraminifera without overprinting of later diagenesis, which contains enough amount of Sr for isotopic
measurement. Analysis of single-grain foraminifera was successively conducted by a combination of low Sr procedural blank
and high precision determination of 87Sr/86Sr ratio. This combination of single-grain foraminifera can be significant for the study and application of Sr isotopic composition
of foraminifera. Measured foraminifera of this study, having a size between 250 μm and 400 μm, were sampled from the carbonate
basement of a ferromanganese crust in western Pacific. Mean value of 87Sr/86Sr ratios of the analyzed single-grain foraminifera is 0.709150 ±0.000013 with internal precision between 4 ppm and 8 ppm
for each measurement run. Average value of total procedural blank of Sr is 14 pg. It is significant but difficult to date
foraminifera in carbonate basements of ferromanganese crusts. Based on the obtained value of 87Sr/86Sr ratio, the analyzed foraminifera can be dated at 0.91 +0.33/−0.39 Ma. |
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| Keywords: | foraminifer ferromanganese crust single-grain 87Sr/ 86Sr ratios dating |
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