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矿床地质  2006 

铁锰结壳中底层洋流活动的地球化学研究

Keywords: 地球化学,铁锰结壳,南极底层流,稀土元素,海山,太平洋

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Abstract:

文章以大洋海山铁锰结壳与南极底层流(AABW)之间关系的角度,从铁锰结壳的结构构造、矿物组合,特别是结壳新壳层的Ce异常和Ce/La比值的区域分布来探讨AABW的活动在铁锰结壳中留下的证据。主要对中太平洋和西北太平洋5座海山的17个铁锰结壳新壳层样品进行了结构构造分析和REE含量测定。结果表明,铁锰结壳的REE含量很高,平均为1716.66×10-6,且轻稀土元素明显富集,LREE/HREE平均值为4.82,除MID06样品具微弱的Ce负异常外,其他铁锰结壳样品均具明显的Ce正异常。为了对比研究AABW的影响,除铁锰结壳外,还引用了不同区域的多金属结核的稀土元素平均值资料按不同区域进行了对比研究,结果发现,AABW活动区和非活动区的δCe值和Ce/La比值有显著差异。一般来说,沿AABW流路,从南向北,δCe值和Ce/La比值有逐渐减小的趋势,但在局部地区,如地形复杂的海山区,AABW的强度会发生变化,其Ce正异常和Ce/La比值可能会局部增大。本项研究成果将有助于全面认识大洋成矿作用与海洋环境变迁的内在联系。

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