大气生成宇宙成因核素^(10)Be在中国黄土中的应用研究进展  

Review on the application of the atmospheric produced ^(10)Be in Chinese loess

作　　者：孔祥辉[1,2] 周卫健[1,2,3,4] 武振坤[1,2] 杜雅娟[1,2] 赵国庆[1,2] 谢兴俊 

机构地区：[1]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,陕西省加速器质谱技术及应用重点实验室,西安710061 [2]西安加速器质谱中心,西安710061 [3]北京师范大学,北京100875 [4]西安交通大学人居环境与建筑工程学院,西安710049

出　　处：《地球环境学报》2016年第3期227-237,共11页Journal of Earth Environment

基　　金：国家自然科学基金项目(41230525);科技部国家重大科学研究计划(2013CB955904)~~

摘　　要：中国黄土^(10)Be研究大体上经历了三个阶段:(1)地球化学行为研究:^(10)Be主要吸附于细颗粒及粘土颗粒,在黄土中保存性好,不会发生明显的化学迁移过程;(2)古气候代用指标应用:^(10)Be在黄土和古土壤层中的浓度变化与代表气候变化的深海氧同位素曲线变化一致,且可借此进行黄土年代标尺的建立;(3)地球环境示踪研究:示踪地磁场倒转及漂移事件,恢复古地磁场相对强度变化,以及定量重建黄土高原地区古降水变化历史等。由于近年来黄土^(10)Be环境示踪研究取得了可喜的成果,笔者认为有必要从以上三个方面对中国黄土^(10)Be研究历史进行较为系统的梳理回顾,总结当前最新研究进展,展望未来黄土^(10)Be在环境示踪中的研究方向,希望能使读者在短时间内了解中国黄土^(10)Be研究的发展脉络。Background, aim, and scope The history of Chinese loess ^（10）Be studies can be recognized as three stages.（1） The geochemical behavior of ^（10）Be in Chinese loess： it is preferred to be absorbed on the small size particles and the clay minerals, it can be preserved well after it deposited and would not be leached by the raillfall;（2） as a paleoclimatic proxy： the variation of ^（10）Be concentration in the loess and paleosol correlated well with the marine isotope stages and with the correlation between these two proxies, it can be used to establish the chronology of Chinese loess-paleosol sequences;（3） tracing earth＇s environmental changes： recovering the variations of geomagnetic field intensity, tracing the geomagneticpolarity reversals/excursions and reconstructing the paleorainfall over the Chinese Loess Plateau. Since very significant progress has been made about the third one recently, it is necessary to make a comprehensive review on the application of cosmogenic^（10）Be in Chinese loess, and by doing this to discuss the future work about the Chinese loess ^（10）Be. Materials and Methods The publications of loess ^（10）Be studies are reviewed here. Among them, the papers published between 1980＇s and 2006 are used to discuss the sources, formation, chemical behavior and its climatic implications in Chinese loess, the others published after 2006 are used to show that the loess ^（10）Be are good proxy for paleogeomagnetic variations tracing and paleorainfall reconstruction. Results The ^（10）Be in Chinese loess is mainly from atmosphere where it is produced via cosmic-ray spallation. The chemical leaching experiments with acid solutions showed that the ^（10）Be in loess and paleosols is strongly bound to soil particles and the mobility due to dissolution is very little. The measurements of ^（10）Be concentrations in loess as a function of grain size indicated that the ^（10）Be is preferred to be adsorbed on small size mineral grains due to larger surfac

关 键 词：大气生成宇宙成因核素10Be 地球化学行为 黄土高原 古地磁场强度 古地磁极性倒转与漂移 古降水 

分 类 号：P531[天文地球—古生物学与地层学]