The study on the early diagenetic processes in REY-rich sediments in Southeast Pacific Ocean and its indicative significance

Li Jiejun; Liu Hongna; Wang Xiaojing; Li Li; Shi Xuefa

doi:10.12284/hyxb2024007

Volume 46 Issue 2

May 2024

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Li Jiejun，Liu Hongna，Wang Xiaojing, et al. The study on the early diagenetic processes in REY-rich sediments in Southeast Pacific Ocean and its indicative significance[J]. Haiyang Xuebao，2024, 46(2)：40–51 doi: 10.12284/hyxb2024007

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The study on the early diagenetic processes in REY-rich sediments in Southeast Pacific Ocean and its indicative significance

doi: 10.12284/hyxb2024007

Li Jiejun^1
,,
Liu Hongna¹,
Wang Xiaojing¹,
Li Li^{1, 2, 3
,
,},
Shi Xuefa^{1, 2, 3
,
,}

1.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology, Laoshan Laboratory, Qingdao 266237, China
3.
Key Laboratory of Deep Sea Mineral Resources Development, Shandong (preparatory), Qingdao 266061, China

Received Date: 2023-10-24
Rev Recd Date: 2023-12-10

Available Online: 2024-05-31

Publish Date: 2024-05-29

Abstract

Abstract

As potential mineral resources, rare earth elements (REY) and yttrium enriched sediments in the deep sea have attracted a lot of attention in recent years. It has been shown by studies that the enrichment process of REY is most likely to occur at the sediment-water interface (SWI), however studies on the early diagenetic processes in REY-enriched sediments are in general lacking. In this paper, we collected two short sediment cores in REY-enriched sediments in the Southeast Pacific Ocean, then we had conducted an in-depth analysis on the early diagenesis process of REY at SWI and its influence on the enrichment mechanism of REY in deep-sea sediment. The low Fe, Mn concentration and high Mo, U and V concentration in pore-water indicated that the sediment cores were in oxic environment. Compared to the REY in overlying water column, the dissolved REY in pore-water characterized by a middle rare earth elements (MREE). In sediment, phosphate phase is the main phase of REY, while the distribution pattern of REY in pore-water may be controlled by the phosphate content in sediments. Our results show that during the early diagenetic processes, the REY initially combined with Fe/Mn phase and other phases re-released into the pore-water, which is subsequently adsorbed by and eventually buried with the phosphate phase. Therefore, the early diagenetic process is an important mechanism of REY enrichment in deep sea sediments.
- early diagenetic process,
- pore-water,
- rare earth elements,
- sediment,
- Southeast Pacific Ocean

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References

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