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Transformation of minerals and mobility of heavy metals during oxidative weathering of seafloor massive sulfide and their environmental significance
Siyi Hu; Chunhui Tao; Shili Liao; Chuanwei Zhu; Zhongrong Qiu
2022
Source PublicationScience of The Total Environment
Volume819Pages:153091
Abstract

Seafloor massive sulfide (SMS) deposits have received widespread attention because of their potential as available metal resources. Deep-sea mining operations significantly increase the exposure of fresh sulfide to oxygenated seawater. Knowledge about mineral transformation and the fate of heavy metals during sulfide oxidation remains insufficient, which is unfavorable for eco-friendly deep-sea mining. Here, a series of partially or completely oxidized sulfide samples collected from the Yuhuang hydrothermal field, Southwest Indian Ridge, were examined for detailed mineralogical, geochemical, and morphological analyses. Models for mineral conversion and heavy metal mobility over time were established through the obtained results to assess the potential environmental impacts associated with deep-sea mining. The absence of hydrous ferric sulfates in the pure oxide samples suggests that they were transformed into iron (oxy)hydroxides after long-term exposure in seawater. There are also indications that amorphous iron (oxy)hydroxides dehydrated to layer-like goethite and that schwertmannite hydrolyzed to globular goethite. The microorganism-related morphology of secondary minerals strengthens the case that sulfide oxidation is a microbially mediated process. The enrichment of Cu, Zn, V, and U in oxidation products indicates that they can serve as effective purification agents to retain heavy metals originated from sulfide and seawater. Heavy metal contents display a progressively increasing trend in the oxide profiles, which can be well explained by our models for oxide crust accumulation. Because secondary minerals have excellent adsorption capability and mineral transformation is a reaction removal of sulfate radicals, we conclude that sulfide oxidation provides a sink for oceanic heavy metal cycles and a sulfur source in balancing the global biogeochemical sulfur cycle. In addition, mining SMS deposits containing a large quantity of Fe-bearing sulfide minerals or iron oxides from inactive hydrothermal fields are conducive to reducing environmental hazards and maintaining the economic value of remaining deposits.

KeywordSeafloor Massive Sulfide oxidative Weathering hydrous Ferric Sulfates iron (Oxy)Hydroxides heavy Metal Mobility
DOI10.1016/j.scitotenv.2022.153091
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Indexed BySCI
Language英语
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13594
Collection矿床地球化学国家重点实验室
Affiliation1.Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
2.Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
3.School of Oceanography, Shanghai Jiaotong University, Shanghai 200030, China
4.Ocean Collage, Zhejiang University, Zhoushan 316021, Zhejiang, China
5.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
6.Fourth Institute of Oceanography, Ministry of Natural Resources, Beihai 53600, China
Recommended Citation
GB/T 7714
Siyi Hu,Chunhui Tao,Shili Liao,et al. Transformation of minerals and mobility of heavy metals during oxidative weathering of seafloor massive sulfide and their environmental significance[J]. Science of The Total Environment,2022,819:153091.
APA Siyi Hu,Chunhui Tao,Shili Liao,Chuanwei Zhu,&Zhongrong Qiu.(2022).Transformation of minerals and mobility of heavy metals during oxidative weathering of seafloor massive sulfide and their environmental significance.Science of The Total Environment,819,153091.
MLA Siyi Hu,et al."Transformation of minerals and mobility of heavy metals during oxidative weathering of seafloor massive sulfide and their environmental significance".Science of The Total Environment 819(2022):153091.
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