岩溶洞穴次生碳酸盐沉积铀及其同位素组成古气候环境研究进展

陈 琼; 陈 琳; 黄嘉仪; 刘淑华; 杨 亮; 米小建; 周厚云

doi:10.11932/karst20150508

岩溶洞穴次生碳酸盐沉积铀及其同位素组成古气候环境研究进展

doi: 10.11932/karst20150508

1.
华南师范大学地理科学学院
2.
华南师范大学地理科学学院/中国科学院地球环境研究所黄土与第四纪地质国家重点实验室

基金项目: 国家自然科学基金项目（41473093，41271212，40973009）、教育部博士点基金项目（20124407110012）和中国科学院黄土与第四纪地质国家重点实验室开放基金项目（SKLLQG1431）

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出版历程
- 发布日期: 2015-10-25

Progress in the study of paleoclimate reconstruction from speleothem uranium and its isotope

1.
School of Geography Science, South China Normal University
2.
School of Geography Science, South China Normal University/State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences

摘要

摘要: 洞穴沉积铀含量及其同位素初始234U/238U[（234U/238U)0]变化均与过去气候环境变化关系密切。文章分别对石笋中U含量和(234U/238U)0的气候意义进行统计分析发现，多数研究认为洞穴沉积U含量和(234U/238U)0可能指示土壤湿度和有效降水变化。然而，不管是对洞穴沉积的U含量还是(234U/238U)0，其气候环境意义解读还存在两种观点。但无论如何，这些研究成果都显示了洞穴沉积的U含量和(234U/238U)0是研究过去气候环境变化的重要替代指标。在未来的研究中，除了土壤环境和过程，还应关注U来源的相对贡献变化和其他微量元素与U元素的关系。这一指标可能在对东亚地区的大气粉尘活动和冬季风演化、地表生物量的变化研究等方面发挥重要作用。
- 洞穴次生碳酸盐沉积 /
- 铀含量 /
- (234U/238U)0 /
- 古气候环境
Abstract: Uranium content and its isotope initial 234U/238U[（234U/238U)0]preserved in speleothems have a considerable potential to record the changes of the paleoclimate and paleoenvironment. Here we review the studies on these elements and their climate implications. Most previous work suggested that the uranium concentration and （234U/238U）0 could indicate the changes of the soil humidity and effective precipitation. However, some researchers hold different viewpoints on this subject. Nevertheless, all these researches agree that U concentration and its isotope should be important alternative indexes for reconstructing paleoclimate and paleoenvironment. In the future, in addition to soil environments and processes, the investigations should be focused on relative contribution of different sources of U and the relationship between U and other trace elementals, which may play an important role in the study of atmospheric dust activity, winter monsoon variations, changes of biomass on the surface, and so on in East Asia.
- speleothem /
- uranium concentration /
- (234U/238U)0 /
- paleoclimate and paleoenvironment

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