Transformation of minerals and mobility of heavy metals during oxidative weathering of seafloor massive sulfide and their environmental significance

doi:10.1016/j.scitotenv.2022.153091

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Transformation of minerals and mobility of heavy metals during oxidative weathering of seafloor massive sulfide and their environmental significance
	Hu, Siyi 1,5,6; Tao, Chunhui 3,4,6; Liao, Shili 6; Zhu, Chuanwei 2; Qiu, Zhongrong 3,6
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2022-05-01
卷号	819 页码:13
关键词	Seafloor massive sulfide Oxidative weathering Hydrous ferric sulfates Iron (oxy)hydroxides Heavy metal mobility
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2022.153091
通讯作者	Tao, Chunhui(taochunhui@sio.org.cn)
英文摘要	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.
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000766809400007
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/178254]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Tao, Chunhui
作者单位	1.Minist Nat Resources, Inst Oceanog 4, Beihai 53600, Peoples R China 2.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China 3.Zhejiang Univ, Ocean Coll, Zhoushan 316021, Zhejiang, Peoples R China 4.Shanghai Jiao Tong Univ, Sch Oceanog, Shanghai 200030, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 6.Minist Nat Resources, Key Lab Submarine Geosci, Inst Oceanog 2, Hangzhou 310012, Peoples R China
推荐引用方式 GB/T 7714	Hu, Siyi,Tao, Chunhui,Liao, Shili,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,2022,819:13.
APA	Hu, Siyi,Tao, Chunhui,Liao, Shili,Zhu, Chuanwei,&Qiu, Zhongrong.(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,819,13.
MLA	Hu, Siyi,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):13.