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新疆伊犁河谷沙漠沉积的稀土元素特征及其环境意义/RARE EARTH ELEMENT CHARACTERISTICS OF DESERT SEDIMENTS IN ILI VALLEY AND THEIR ENVIRONMENTAL IMPLICATION[J]
Authors
Chen Xiuling
Guo Licheng
+8 more
Jia Limin
Li Zhizhong
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
李志忠
福建省湿润亚热带山地生态省部共建国家重点实验室培育基地,福建师范大学地理科学学院,福州350007
贾丽敏
郭利成
陈秀玲
Publication date
1 January 2013
Publisher
Abstract
以伊犁河谷西部塔克尔莫乎尔沙漠内的可克达拉(TKP)剖面作为研究对象开展了稀土元素特征分析,结合方解石变化特征,探讨沙漠沉积稀土元素与环境变化间的关系.研究结果表明TKP剖面的稀土元素总量(不含Y)平均为130.90 μg/g,变化范围为32.88 ~ 238.58μg/g,整个剖面分配模式相似,缓右倾斜型,轻稀土适度富集,δCe,δEu和LREE/HREE比值相近,Eu中度负异常,未见明显Ce异常,指示剖面物质来源的一致性和总体干旱、半干旱的气候环境.包括Ce在内的各稀土元素、∑REE以及LREE/HREE在垂向变化上高度相关,并与方解石含量存在较好的相关关系,表明其与气候变化密切相关,在干旱区的沙漠沉积中稀土元素对古气候变化具有良好的指示作用,并据此重建了晚全新世以来伊犁河谷的气候演变过程
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Last time updated on 29/11/2016