Article
Engineering, Marine
Xixi Liu, Xuguang Chen, Jiakang Wei, Shuai Jin, Xingzheng Gao, Guodong Sun, Jiahao Yan, Qingqing Lu
Summary: This study investigates the erosion properties of high water content, semi-fluid dynamic sediment layer under a double-row jet collector through experiments and simulations. The study proposes formulas for the distribution of flow field attenuation and the maximum axial pressure, and establishes a model for erosion depth-time and erosion depth prediction. These results provide theoretical reference for flow field calculation in nodule mining operation with double-row jet collector.
Article
Chemistry, Multidisciplinary
Chengpeng Sun, Huaiming Li, Wenpeng Li, Xinxin Li, Xiaoxia Lue
Summary: This study analyzed the distribution and sources of isoprenoid glycerol dialkyl glycerol tetraethers (isoGDGTs) and branched glycerol dialkyl glycerol tetraethers (brGDGTs) in deep-sea sediments. The results revealed the contribution of benthic Thaumarchaeota to isoGDGTs in the seamount area and in-situ production of brGDGTs. The findings suggest the importance of considering both planktonic and benthic Thaumarchaeota in paleoceanographic reconstruction and highlight the discrepancy between sea surface temperature deduced by TEX86 and observed sea surface temperature.
Article
Chemistry, Analytical
Bowen Li, Yonggang Jia, Zhihan Fan, Kai Li, Xuefa Shi
Summary: This study uses a device integrated with multiple sensors to simulate the disturbance process of deep-sea polymetallic nodule mining on seabed sediments. The mining process has a significant impact on the turbidity, density, and dissolved oxygen content of the water, affecting the local ecological environment. It is suggested to adopt suction and ore separation technology on mining ships to minimize the environmental impact.
Article
Geology
Yong Zhang, Jinggui Sun, Yubo Ma
Summary: In this study, we analyzed the sulfur isotope data, zircon U-Pb isotope data, sulfide Rb-Sr data, and molybdenite Re-Os data of the Meng'entaolegai deposit and its surrounding regions. The results showed that sulfur was mainly derived from a magmatic source, and the deposit formed during two mineralization episodes: an early episode at 230 Ma and a second episode at 147 Ma.
ORE GEOLOGY REVIEWS
(2023)
Article
Environmental Sciences
Kaveh Purkiani, Benjamin Gillard, Andre Paul, Matthias Haeckel, Sabine Haalboom, Jens Greinert, Henko de Stigter, Martina Hollstein, Matthias Baeye, Annemiek Vink, Laurenz Thomsen, Michael Schulz
Summary: This study reports on a sediment plume dispersion experiment conducted in the German license area for exploration of polymetallic nodules in the northeastern tropical Pacific Ocean. The experiment used a numerical model to analyze the dispersion of sediment plumes induced by a small-scale dredge experiment, with results showing that the model can accurately reproduce suspended sediment concentration and redeposition patterns.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geology
Dongjie Bi, Xuefa Shi, Mu Huang, Miao Yu, Fangyu Shen, Jianxing Liu, Tiancheng Zhou, Tianyu Chen, Fengdeng Shi, Xiaojing Wang, Xiaoke Qiang, Jihua Liu
Summary: Pelagic sediments enriched in rare earth elements and yttrium (REY) have attracted significant attention. However, the mechanism responsible for this enrichment remains unclear due to challenges in obtaining robust geochronology. In this study, we integrated multiple geochronologic approaches to determine a chronostratigraphic framework for a pelagic sediment core collected from the northwestern Pacific Ocean. Our results indicate that REY-rich sediments were deposited prior to -2.5 Ma, with a highly REY-rich sediment layer deposited at -11.5-9.5 Ma. We propose that a low sedimentation accumulation rate and the contribution from active bottom currents are key factors in the enrichment of REY in pelagic sediments.
ORE GEOLOGY REVIEWS
(2023)
Article
Multidisciplinary Sciences
Tanja Stratmann, Karline Soetaert, Daniel Kersken, Dick van Oevelen
Summary: Polymetallic nodule fields play a critical role in supporting the integrity of the abyssal food web, and the removal of nodules may result in reduced local benthic biodiversity.
SCIENTIFIC REPORTS
(2021)
Article
Geology
Xianze Deng, Gaowen He, Yue Xu, Yonggang Liu, Fenlian Wang, Xiaoyu Zhang
Summary: Polymetallic nodules found around the Caiwei Guyot in the northwestern Pacific Ocean have high economic value and are enriched in critical metals. These nodules have a complex laminar structure and are composed of Fe-vernadite. The research suggests that the northwest Pacific Ocean is an ideal metallogenic belt for polymetallic nodules with abundant Co, Pt, and REY resources.
ORE GEOLOGY REVIEWS
(2022)
Article
Engineering, Marine
Linzhang Wang, Zhigang Zeng
Summary: The ferromanganese deposit is a marine mineral resource rich in Mn, Fe, Co, Ni, and Cu. Its growth process is influenced by the guyot environment and seawater geochemical characteristics. Studying the texture morphology, microstructure, mineralogical features, and geochemical features of the ferromanganese crusts deposits is important for understanding their formation process and properties.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Physical
Jaewoo Jung, Kiseong Hyeong, Jae Hun Kim, Jonguk Kim, Youngtak Ko, Kiho Yang, Yongmoon Lee, Hyeonho An
Summary: This study investigates deep sea surface sediments from the equatorial Pacific Ocean and finds at least two sources of smectite, one from South America and the other from Asia and North America. The study also observes a positive correlation between the iron content of smectite and the ATP concentration in deep sea sediments, suggesting the importance of Fe-rich smectite as an iron source associated with microbial activity in deep sea environments.
APPLIED CLAY SCIENCE
(2022)
Article
Engineering, Chemical
Jia Li, Yuqing Hu, LeiTing Yue, Zuoying Cao, Qinggang Li, Li Zeng, Wenjuan Guan, Mingyu Wang, Guiqing Zhang, Shengxi Wu
Summary: The recovery of Ni, Co and Mn from deep-ocean polymetallic nodules leaching solution using a synergistic solvent extraction system shows promising potential for industrial application, providing high efficiency and economic benefits.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Geology
Khan Junaid, Hua-Zhou Yao, Kai-Xu Chen, Jing-Yin Xu, Jian-Xiong Wang, Wei-Guo Sun, Tahir Asma, Yan-Guang Wei, Fang Song
Summary: This study reveals the potential of precious metals and oxides in the West Ethiopian region and provides important experimental data for geochemical mapping. The results suggest high economic potentials in the area and indicate the possible distribution of various elements under different geological features.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Tiancheng Zhou, Xuefa Shi, Mu Huang, Miao Yu, Dongjie Bi, Xiangwen Ren, Jihua Liu, Aimei Zhu, Xishan Fang, Meijuan Shi
Summary: High concentrations of rare-earth elements and yttrium were found in deep-sea sediments in the eastern South Pacific Ocean. The REY enrichment is primarily hosted by bioapatite fossils and Fe-Mn micronodules. The REY contents in the sediments are positively correlated with P2O5 and negatively correlated with Ce anomalies, indicating that seawater was the main ore-forming fluids during the formation of REY-rich sediments.
ORE GEOLOGY REVIEWS
(2021)
Article
Engineering, Marine
Yuheng Song, Shiyang Yin, Ning Zhang, Fengnian Lu, Zexuan Cheng
Summary: To address the shortage of land mineral resources, countries are focusing on developing deep-sea mineral mining technology. This study proposes a dynamic traction calculation model for the deep-sea polymetallic nodule collector (DPNC) and analyzes the impact of dynamic grouser-soil interaction on traction force. Results show that the dynamic traction force is smaller than the static traction force and fluctuates significantly. The ratio of grouser height to spacing should be optimized in DPNC design to improve traction performance and stability.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Microbiology
Liping Wang, Xiupian Liu, Qiliang Lai, Li Gu, Zongze Shao
Summary: A novel Gram-stain-negative bacterium, designated as D167-6-1(T), was isolated from deep-sea sediment collected from the Pacific Ocean. Phylogenetic analysis revealed that strain D167-6-1(T) formed a monophyletic branch within the genus Halomonas, and represents a novel species named Halomonas diversa sp. nov.
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
(2021)
