Terrestrial manganese-53 -: A new monitor of Earth surface processes
Terrestrial manganese-53 -: A new monitor of Earth surface processes
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DOI：
10.1016/j.epsl.2006.09.016
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发表时间：
2006-11-15
影响因子：
5.3
通讯作者：
Winckler, Gisela
中科院分区：
文献类型：
--
作者：
Schaefer, Joerg M.;Faestermann, Thomas;Winckler, Gisela
我们报告的第一个系统的研究陆地宇宙成因放射性核素锰-53（T-1/2 = 3.7马）测量的13个样品从9个粗玄岩表面在干谷，南极洲。陆地上的锰-53浓度与宇宙射线产生的氦-3和氖-21浓度在相同的样品中有很好的相关性，这意味着锰-53是在原位连续产生的，并在数百万年内定量保留。对铁（唯一重要的目标元素）以及高纬度和海平面进行标准化的陆地锰-53生产率测定得出的值为P-53 = 103 +/- 11原子/年（-1）（g Fe）（-1）。这与从模型计算中获得的120 +/- 18原子yr（-1）（g Fe）（-1）的理论值一致。我们的研究结果表明，锰-53浓度散装陆地岩石可用于监测地球表面过程的时间尺度超过10我。(c)2006 Elsevier B. V.保留所有权利。
We report the first systematic study of the terrestrial cosmogenic radionuclide manganese-53 (T-1/2 = 3.7 Ma) measured in thirteen samples from nine dolerite surfaces in the Dry Valleys, Antarctica. The terrestrial manganese-53 concentrations correlate well with cosmic-ray-produced helium-3 and neon-21 concentrations in the same samples, implying that the manganese-53 is produced continuously in situ and retained quantitatively over millions of years. The terrestrial manganese-53 production rate determination normalized to iron (the only important target element) and to high-latitude and sealevel yields a value of P-53 = 103 +/- 11 atoms yr(-1) (g Fe)(-1). This is consistent with the theoretical value of 120 +/- 18 atoms yr(-1) (g Fe)(-1) obtained from modeling calculations. Our results show that the manganese-53 concentrations in bulk terrestrial rocks can be used to monitor Earth surface processes on time-scales exceeding 10 My. (c) 2006 Elsevier B.V. All rights reserved.