...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Quaternary geochronology >Radium-226 chronology of Holocene travertine from Esanatoglia (Central Italy)
【24h】

Radium-226 chronology of Holocene travertine from Esanatoglia (Central Italy)

机译：Esanatoglia（意大利中部）全新世钙华的Rad-226年表

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Here we investigate the feasibility of using alpha-spectrometric 226Ra methodology to date low U freshwater carbonate deposits (o0.1 mg g1) by analysing Holocene freshwater travertine deposits from Esanatoglia, Umbro-Marchean Apennines, Central Italy. Previously, such methods have been tested on hydrothermal deposits, which are characterised by high Ra and U. We calculate a 226Ra age estimate of 2.970.4 ka (1s) for Holocene travertine that is in reasonable agreement with archaeological evidence by assuming that the 226Ra initial activity of the Holocene travertine is comparable with that of present-day carbonate deposits in the same area. We also investigate the use of Ba to normalise 226Ra activities. Comparison of age estimates based on Ra methods with ages derived from alphaspectrometric 230Th/234U isochron techniques for the same co-eval sub-samples indicates that, where only alpha-spectrometric methods are available, the former are likely to be much more useful for Holocene travertine material, especially if there is a significant detrital component.
机译：在这里，我们通过分析意大利中部Umbro-Marchean Apennines的Esanatoglia的全新世淡水钙华沉积物，研究使用α光谱226Ra方法测定低U淡水碳酸盐沉积物（o0.1 mg g1）的可行性。以前，这类方法已在具有高Ra和U特征的热液矿床上进行了测试。我们假设全新世钙华的226Ra年龄估计值为2.970.4 ka（1s），与考古证据合理地吻合，并假设226Ra全新世钙华的初始活性与当今同一地区的碳酸盐矿床相当。我们还调查了使用Ba归一化226 Ra活动的情况。比较基于Ra方法的年龄估计值和针对相同的共同评估子样本的使用alphaspectrometric 230Th / 234U等时同步技术得出的年龄，这表明，如果只有alpha spectrometric方法可用，则前者可能对全新世更为有用钙华物质，尤其是如果存在大量碎屑成分时。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号