| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
GAO Jingjing, LIU Jihua, ZHANG Hui, YAN Shijuan, WANG Hongmin, CUI Jingjing, HE Lianhua. Geochemistry and sources of rare earth elements in cobalt-rich crusts from the Caiwei and Xufu seamounts, West Pacific Ocean[J]. Marine Geology & Quaternary Geology, 2022, 42(3): 87-99. doi: 10.16562/j.cnki.0256-1492.2021071302
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Geochemistry and sources of rare earth elements in cobalt-rich crusts from the Caiwei and Xufu seamounts, West Pacific Ocean
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Abstract
Using the testing methods of XRD, ICP-OES and ICP-MS, the mineral composition, major and minor elements contents of cobalt-rich crusts collecting from the Caiwei Guyot and Xufu Guyot in the West Pacific Ocean have been determined. Based on the data, we discussed in this paper the geochemical characteristics and material sources of the REE. It is observed that the cobalt-rich crust is dominated by the crystalline mineral of vernadites, accompanied by the auxiliary minerals of quartz, plagioclase, potassium feldspar and carbon fluoride apatite. Amorphous ferric minerals also occur in certain amounts in the crusts. In terms of chemical composition, Mn contents change within 16.20%～26.62%, and Fe contents 8.56%～18.19%, which are the highest among the others. Phosphatization is observed in the old crust layers. REE are enriched in the cobalt-rich crusts. LREE are higher than HREE. REE contents are as high as 1 842～2 854 µg/g, in which Ce accounted for nearly 50%. Moreover, it is found that REE contents in the old layers are higher than that in the new layers, and it is believed that phosphatization in the old layers might play an active role in the REE distribution pattern. And REE diagrams show that there are positive Ce anomalies but no Eu anomalies, so Ce is relatively enriched. Meanwhile, REE show positive correlation with Ce, Y, CaO, P2O5, Ba and Sr, negative correlation with Fe, Al2O3, Na2O, K2O, MgO, TiO2, Pb and V, but no correlation with Mn, Co, Cu, Ni and Zn. By the way, the elements of the cobalt-rich crusts may be classified into four groups by clustering analysis. ①Phosphate group including REE, Ce, Y, CaO, P2O5, Ba and Sr. ② Mn group including Mn, Co, Cu, Ni and Zn. ③ Fe group including Fe, TiO2, Pb and V. ④ Detritus group including Al2O3, Na2O, K2O and MgO. In conclusion, cobalt-rich crusts from the Caiwei Guyot and Xufu Guyot of the West Pacific Ocean are hydrogenetic in origin, and REE are precipitated together with phosphate group in the seawater, that caused the enrichment of REE in the cobalt-rich crusts.
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Keywords:
- cobalt-rich crusts /
- REE /
- geochemical /
- source /
- West Pacific Ocean
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References
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GAO Jingjing, LIU Jihua, ZHANG Hui, YAN Shijuan, WANG Hongmin, CUI Jingjing, HE Lianhua. Geochemistry and sources of rare earth elements in cobalt-rich crusts from the Caiwei and Xufu seamounts, West Pacific Ocean[J]. Marine Geology & Quaternary Geology, 2022, 42(3): 87-99. doi: 10.16562/j.cnki.0256-1492.2021071302
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Figure 1.
The sampling location of cobalt-rich crusts samples of CD16 and XD3
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Figure 2.
The photos showing the stratification of cobalt-rich crust samples of CD16 and XD3
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Figure 3.
X-ray diffraction analysis of the cobalt-rich crust samples of CD16 and XD3
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Figure 4.
Ternary discrimination diagram for cobalt-rich crusts[26]
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Figure 5.
REE distribution curves of the cobalt-rich crust samples of CD16 and XD3
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Figure 6.
Correlation diagram of cobalt-rich crusts [30]
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Figure 7.
Correlation plots of REE and major elements in the cobalt-rich crusts
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Figure 8.
Element clustering spectrum of the cobalt-rich crusts