Effect of Phosphatization on Element Concentration of Cobalt‐Rich Ferromanganese Crusts
Effect of Phosphatization on Element Concentration of Cobalt‐Rich Ferromanganese Crusts
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磷化对富钴锰铁结壳元素浓度的影响
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
You Guoqin
中科院分区：
文献类型：
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作者：
Pan Jiahua;E. H. Carlo;Yang Yi;L. Shuqin;You Guoqin
摘要通过小尺度研究磷酸盐化作用对富钴结壳化学性质的影响，为结壳矿产资源的评价和综合利用提供了有益的信息。从西北太平洋麦哲伦海山的10厘米厚样品的顶部到底部，以5毫米的间隔采集子样品。成矿元素和稀土元素的浓度剖面表明，年轻的未磷酸化结壳与老的磷酸化结壳存在明显的差异。老结壳中Fe、Mn、Si、Al、Zn、Mg、Co、Ni、Cu等元素亏损，Ca、P、Sr、Ba、Pb等元素富集。贫元素的顺序为Co > Ni > Mg > Al > Mn > Si > Cu > Zn > Fe，富元素的顺序为P > Ca > Ba > Pb > Sr。磷酸盐矿物控制了结壳中成矿元素的浓度变化，并导致主要成矿元素Co、Ni的损失。磷酸盐化作用也影响结壳中稀土元素的丰度。稀土元素在老结壳中的富集程度高于年轻结壳，Ce的含量高于年轻结壳，但稀土元素在新老结壳中的分布格局及其分馏特征没有发生根本性变化。老结壳中的Y正异常与磷酸盐化无关。
Abstract A detailed study on a small scale of the effect of phosphatization on the chemistry of marine cobalt‐rich ferromanganese crusts supplies useful information for the evaluation and comprehensive utilization of crust mineral resources. Sub‐samples from top to bottom of a 10‐cm thick sample from the NW Pacific Magellan seamount were taken at 5 mm intervals. The concentration profiles of ore‐forming and rare earth elements show that obvious differences exist between young unphosphatized crusts and old phosphatized crusts. In the old crusts Fe, Mn, Si, Al, Zn, Mg, Co, Ni and Cu elements are depleted and Ca, P, Sr, Ba and Pb elements are enriched. The order of depletion is Co > Ni > Mg > Al > Mn > Si > Cu > Zn > Fe, while the order of enrichment is P > Ca > Ba > Pb > Sr. The phosphate mineral controls the concentration variation of the ore‐forming elements in crusts and causes loss of the main ore‐forming elements such as Co and Ni. The phosphatization also affects the abundance of REEs in the crusts. REEs are more abundant and the content of Ce in old crusts is higher than that in young crusts, however, the pattern of REEs and their fractionation characteristics in new and old crusts are not fundamentally changed. A Y‐positive anomaly in old crusts has no relationship to the phosphatization.