Fe/Mn Variations of Late Quaternary Ferromanganese Crusts from the Central North Pacific: Implications for the Paleoenvironment Change
详细信息
- 责任者：Hu Rong (State Key Laboratory for Mineral Deposits Research ; School of Earth Sciences and Engineering ; Nanjing University ; Nanjing 210093 ; China) ; Chen Tianyu
- 刊名：Geological Journal of China Universities
- 出版年：2012
- 卷期：18(4)
- 关键词：铁 ; iron ; 锰结核 ; manganese nodules ; 第四纪 ; Quaternary ; 北太平洋 ; North Pacific
- 页码：p.751-758
- 图表：3 illus., 41 refs.
- 分类号：1400
- issnNo：ISSN1006-7493
- isbnNo：CN32-1440/P
摘要
This paper selected two densely structured crusts (MP3D07 and CXD55) with well rhythmic growth pattern and analyzed their spatially high-resolution element contents by an electron probe. The results show that the Fe/Mn ratios of both crusts in this study reveal rhythmic variations, which coincides with benthic oxygen isotope fluctuation in glacial-interglacial cycles since ~1 Ma and the Fe/Mn ratios in glacial stages are higher than those in interglacial stages. Such distinct glacial and interglacial signal extracted from the ferromanganese crusts indicates that the Fe-Mn contents of crusts are related with global climate change. During the glacial stages, together with the influence of Subarctic water mass, the increased eolian input which brought large amount of iron and other nutritive elements lead to higher primary productivity in Pacific surface water, and thus increased iron flux to deep water by release of biological particles, which are responsible for the increase in the Fe/Mn ratios of ferromanganese crusts.
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