中国黄土^(10)Be重建古地磁场变化史的初步研究  

Preliminary study on the reconstruction of the paleogeomagnetic intensities by ^(10)Be in Chinese loess

作　　者：周卫健[1,2,3] 孔祥辉[1,5] 鲜锋[1,2] 武振坤[1,2] 陈茂柏[1,2,4] 

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,西安710075 [2]西安加速器质谱中心,西安710052 [3]西安交通大学.西安710049 [4]中国科学院上海应用物理研究所,上海201800 [5]中国科学院研究生院.北京100049

出　　处：《地球环境学报》2010年第1期20-27,共8页Journal of Earth Environment

基　　金：国家科技部基础研究和平台支撑项目;国家基金委项目;中科院方向性项目

摘　　要：针对黄土磁性记录重建古地磁场变迁及黄土^(10)Be示踪古地磁场变化史的问题,提出了将黄土磁化率作为黄土^(10)Be浓度受气候因素(降水和降尘)影响部分的代用指标,以及分离黄土^(10)Be浓度中受地磁场调制和受气候影响的不同组分的思路。在平均值概念(MVC)基础上,引入了气候修正因子,进一步消除了气候因素对^(10)Be浓度变化的影响;从西峰和洛川黄土剖面的^(10)Be记录重建了过去80 ka、130 ka及700~900 ka大气^(10)Be产率史,有助于解决中国黄土^(10)Be环境示踪和重建全球古地磁场变化史的科学难题。In this paper, the difficulties were summarized in the reconstruction of the paleogeomagnetic intensities by using either the paleomagnetie approach or the ^10Be records in Chinese loess; a new idea was put forward that takes the susceptibility as a climate proxy of ^10Be composition affected by climate factors （ Monsoon precipitation and dust flux） to separate the influence of the climate factors from that of the geomagnetic factor on the measured concentration in loess samples. A climate correction factor was introduced into the MVC method based on the mean value concept（MVC） to further clear up the effect of the climate change on the reconstructed results; the past 80 ka, 130 ka and 700 -900 ka ^10Be production rates in atmosphere have been reconstructed, in turn, the global paleogeomagnetie intensities, which have facilitated to solve the academic difficult in environment trace research from ^10Be records in Chinese loess.

关 键 词：环境示踪 多变量系统 线性回归 平均值概念 重建 残差 

分 类 号：P318.44[天文地球—固体地球物理学]