Enrichment mechanism of critical metals and records of paleoenvironment in a polymetallic nodule from the Somali Basin

doi:10.18654/1000-0569/2023.09.14

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

	Enrichment mechanism of critical metals and records of paleoenvironment in a polymetallic nodule from the Somali Basin
	Cheng YuLong 1,2,3,4; Xu YongHang 3,4; Li DonYi 3,4; Chen Jian 3,4; Li YunHai 3,4; Lin FanYu 4; Yin XiJie 4
刊名	ACTA PETROLOGICA SINICA
	2023-09-01
卷号	39 期号:9 页码:2778-2794
关键词	Somali Basin Polymetallic nodule Critical metal Enrichment mechanism Paleoenvironment record
ISSN号	1000-0569
DOI	10.18654/1000-0569/2023.09.14
通讯作者	Xu YongHang(xuyonghang@tio.org.cn)
英文摘要	Polymetallic nodules are important oceanic mineral resources, which are rich in Mn, Fe, Ni, Cu and critical metals, such as Co and REY (rare earth elements plus yttrium). In order to explore the enrichment mechanism of critical metals and records of paleoenvironment in a nodule from the Somali Basin, Northwest Indian Ocean, its mineral compositions were analyzed by X-ray diffraction (XRD) and fine scale elemental changes were analyzed in situ by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) and electron probe microanalysis (EPMA). The results show that the structures of the nodule change outward from columnar to palmar and then to columnar. The nodule is primarily composed of hydrogenetic Fe-rich layers with averaged contents of MnO 25. 1%, FeO 30.4%, Co 0.26%, Ni 0.24%, Cu 0.09% and Sigma REY 1981 x 10(-6). However, there is a thin (100 similar to 200 mu m) diagenetic Mn-rich layer in the outer part of the nodule with averaged contents of MnO 52. 0%, FeO 7. 40%, Co 0. 09%, Ni 2.45%, Cu 0.53% and Sigma REY 719 x 10(-6). The Fe -rich layers may mainly contain Fe-vernadite, while the Mn-rich layer may mainly be composed of buserite I Ni and Cu in the nodule are primarily enriched in buserite I, while Co and REY mainly occur in Fe-vernadite and Co shows an "inflection point". HREE are relatively enriched in Mn-rich minerals (buserite I), while LREE are relatively enriched in Fe-vernadite. Sigma REY show a downward trend from inside to outside in the nodule and the change of REY is dominant by Ce. Furthermore, there is a negative correlation between the growth rate of the nodule and its delta Ce while no obvious correlation between Mn/Fe and delta Ce, indicating that the Ce anomaly of the nodule is likely controlled by its growth rate and cannot distinguish the fine scale origin of the nodule and the redox environment alone. According to the empirical formula of Co, the age of the nodule is similar to 1. 46Ma. The initial formation of its columnar structure maybe related to the paleooceanic transition in the late Early Pleistocene, while the palmar structure may grow since similar to 0. 6Ma when intensed dust input after MPT (Middle Pleistocene Climate Transition) caused high Si and Al contents and diluted other metallogenic elements. The Mn-rich layer may origin from the suboxic environment during the Last Interglacial and exhibits symmetry and gradient, which indicates a gradual change and recovery of the redox environment.
WOS关键词	CENTRAL INDIAN BASIN ; MANGANESE NODULES ; FERROMANGANESE NODULES ; MINERALOGY ; ELEMENTS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:001059083200014
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/181740]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Xu YongHang
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.Fujian Prov Key Lab Marine Phys & Geol Proc, Xiamen 361005, Peoples R China 4.Minist Nat Resources, Inst Oceanog 3, Lab Ocean & Coast Geol, Xiamen 361005, Peoples R China
推荐引用方式 GB/T 7714	Cheng YuLong,Xu YongHang,Li DonYi,et al. Enrichment mechanism of critical metals and records of paleoenvironment in a polymetallic nodule from the Somali Basin[J]. ACTA PETROLOGICA SINICA,2023,39(9):2778-2794.
APA	Cheng YuLong.,Xu YongHang.,Li DonYi.,Chen Jian.,Li YunHai.,...&Yin XiJie.(2023).Enrichment mechanism of critical metals and records of paleoenvironment in a polymetallic nodule from the Somali Basin.ACTA PETROLOGICA SINICA,39(9),2778-2794.
MLA	Cheng YuLong,et al."Enrichment mechanism of critical metals and records of paleoenvironment in a polymetallic nodule from the Somali Basin".ACTA PETROLOGICA SINICA 39.9(2023):2778-2794.