• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Quaternary geochronology >High resolution OSL and post-IR IRSL dating of the last interglacial-glacial cycle at the Sanbahuo loess site (northeastern China)
【24h】

High resolution OSL and post-IR IRSL dating of the last interglacial-glacial cycle at the Sanbahuo loess site (northeastern China)

机译：Sanbahuo黄土站点（中国东北）最后一个冰河-冰川周期的高分辨率OSL和IR IRSL测年

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

Northeastern China is located in the East Asian monsoon region; it is sensitive to both high and low latitude global climate systems. Loess deposits in the region have considerable potential as sensitive archives of past climate changes. However, research into loess deposition and climate change in this region is restricted by the lack of independent age control. In this study, coarse-grained quartz SAR OSL and K-feldspar post-IR infrared (IR) stimulated luminescence (post-IR IRSL; pIRIR(290)) methods have been used to date the Sanbahuo loess site in northeastern China. The quartz OSL characteristics are satisfactory. The measured pIRIR(290) D-e's do not vary significantly with IR stimulation temperatures between 50 degrees C and 260 degrees C; a first IR stimulation temperature of 200 degrees C was adopted. Dose recovery tests were performed by adding different laboratory doses to both laboratory bleached (300 h SOL2) samples and natural samples; the results are satisfactory up to similar to 800 Gy. Resulting quartz OSL and feldspar pIRIR(290) ages are in good agreement at least back to similar to 44 ka; beyond this feldspar pIRIR(290) ages are older. The feldspar ages are consistent with the expected age of the S1 palaeosol (MIS 5). There appears to have been a period of fast loess deposition at similar to 62 ka, perhaps indicative of winter monsoon intensification with a very cold and dry climate that lead to a serious desertification of dunefields in northeastern China. (C) 2015 Elsevier B.V. All rights reserved.
机译：中国东北位于东亚季风区。它对高纬度和低纬度全球气候系统都很敏感。该地区的黄土沉积物具有作为过去气候变化敏感档案的巨大潜力。然而，由于缺乏独立的年龄控制，对该地区黄土沉积和气候变化的研究受到限制。在这项研究中，粗粒石英SAR OSL和K长石的IR后红外（IR）激发发光（IR IRSL后; pIRIR（290））方法已用于确定中国东北三八活黄土的位置。石英OSL特性令人满意。在50℃至260℃之间的IR刺激温度下，测得的pIRIR（290）D-e不会显着变化;采用200℃的第一IR刺激温度。通过将不同的实验室剂量添加到实验室漂白（300 h SOL2）样品和天然样品中进行剂量恢复测试;高达800 Gy的结果令人满意。产生的石英OSL和长石pIRIR（290）的年龄至少相差44 ka很好;超过这个长石的pIRIR（290）年龄更大。长石年龄与S1古土壤的预期年龄一致（MIS 5）。似乎出现了一个类似于62 ka的快速黄土沉积期，这可能表明冬季季风加剧，气候非常寒冷干燥，导致了中国东北沙丘的严重荒漠化。 （C）2015 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
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