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中太平洋Allison海山富Co结壳Os同位素组成及其生长间断与生长年代的确定 被引量:5

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摘要 以中太平洋Allison海山的富钴结壳A1-1为研究对象,在其结构观察的基础上,平均按1.3mm间隔取样,测定各分层Os同位素组成,建立了187Os/188Os随深度演化曲线.通过与40Ma以来的大洋海水的Os同位素组成演化曲线对比,并结合10Be年龄模式下的Os同位素曲线的变化特征,识别出了两次生长间断(H1和H2).H1和H2分别发生于13.6~29.6和6.8~9.8Ma.在此基础上,确定了结壳A1-1生长年龄标定方案:对于小于6.8Ma的壳层,其年龄用10Be年龄模式标定;对于大于6.8Ma的壳层,其年龄用Os同位素曲线标定.如此确定的该结壳最内层形成年龄(最老年龄)为39.5Ma.
出处 《中国科学(D辑)》 CSCD 北大核心 2008年第9期1130-1135,共6页 Science in China(Series D)
基金 科技部国际科技合作项目和中国大洋协会“十一五”项目(编号:2006DFB21620,DY105-01-01-09)资助
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