CHEMICAL COMPOSITION AND PALEOENVIRONMENTAL RECORD OF THE CO-RICH CRUST FROM MAGELLAN SEAMOUNT IN WESTERN PACIFIC
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摘要: 针对取自西太平洋麦哲伦海山的富钴结壳,运用EPMA技术研究了其微区成分特征,估算并讨论了结壳的生长速率和生长年龄,并结合前人研究成果讨论了结壳的古环境记录。研究发现:结壳Mn、Fe、Co、Ni、Cu、Ca、P和Al的元素平均含量分别是29.04%、17.40%、0.73%、0.33%、0.15%、1.72%、0.35%和0.45%,与中、西北太平洋、印度洋及大西洋结壳相比具有高Mn、富Co和贫Ni的特征;结壳初始生长年龄为19.26 Ma,在8.05~11.3 Ma之间出现了约3 Ma的生长间断;进一步研究表明,结壳的Al/(Fe+Mn)、Co/(Ni+Cu)和Fe/Mn微区记录能分别较好地反映亚洲季风气候演变、海水氧化性演变和冰室期-变暖期的古气候演变及其相互之间的联系。Abstract: The Co-rich crust samples collected from the Magellan seamounts in the West Pacific have been analyzed for their compositional characteristics in micron scale by using EPMA. The growth rate and age of the samples are calculated according to the concentration of Cobat. Combined with the data from previous researches, paleoenvironmental records of the sample have been further explored. The results show that the average concentration of Mn, Fe, Co, Ni, Cu, Ca、P and Al in the samples is 29.04%、17.40%、0.73%、0.33%、0.15%、1.72%、0.35% and 0.45% respectively. Compared with the average value of elements in the Co-rich crusts from the Mid-Pacific, Northwest Pacific, Atlantic and Indian ocean, the composition of element chemistry of the samples is characterized by high Mn, Co and low Ni. Dating data shows that the crust is 19.26 Ma in age and there is a hiatus from 11.3 Ma to 8.05 Ma, upon which the growth rate of the sample was calculated; Further studies reveals that the ratios of Al/(Fe+Mn), Co/(Ni+Cu) and Fe/Mn records of the samples may indicate the evolution of the Asian monsoon, the oxidation of seawater and the changes in paleoclimate between icehouse and warming periods.
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Key words:
- Co-rich crust /
- geochemistry /
- palaeoenvironment /
- western-Pacific /
- Magellan seamounts
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