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泥盆纪F-F之交海底热液活动与海洋酸化:来自稀土元素的证据

, PP. 1089-1099

Keywords: 泥盆纪,生物灭绝,稀土元素,热液活动,四素组效应,海水酸化

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Abstract:

?利用ICP-MS对采集于广西桂林杨堤弗拉阶-法门阶(F-F)之交碳酸盐岩地层样品的测试分析,表明测试样品稀土元素总含量平均值为33.32μgg-1;轻稀土与重稀土含量比值的平均值为6.35,明显富轻稀土,呈现轻稀土富集的分布模式;Eu异常值的平均值为1.13,普遍呈正异常,并在F-F界线附近出现两次明显的Eu正异常峰值;测试样品稀土元素具明显的四素组效应,并在两次Eu正异常层位表现为明显的M型四素组效应.综合杨堤剖面稀土元素及相关微量元素特征,认为杨堤剖面在上、下Kellwasser层位(KWH)发生了两次明显的热液活动,并导致海水酸化.热液活动带来的多金属离子和酸性液体对生态系统产生重大影响,破坏海洋生物的生存环境和自身组织结构,引起以层孔虫-珊瑚礁为标志的宏体生物大灭绝.

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