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

IOCAS-IR > 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 1,2; Li DonYi 1,2; Chen Jian 1,2; Li YunHai 1,2; Lin FanYu 1; Yin XiJie 1
	2023-09-01
发表期刊	ACTA PETROLOGICA SINICA
ISSN	1000-0569
卷号	39 期号:9 页码:2778-2794
通讯作者	Xu YongHang(xuyonghang@tio.org.cn)
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.
关键词	Somali Basin Polymetallic nodule Critical metal Enrichment mechanism Paleoenvironment record
DOI	10.18654/1000-0569/2023.09.14
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:001059083200014
出版者	SCIENCE PRESS
WOS关键词	CENTRAL INDIAN BASIN ; MANGANESE NODULES ; FERROMANGANESE NODULES ; MINERALOGY ; ELEMENTS
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/181741
专题	海洋地质与环境重点实验室
通讯作者	Xu YongHang
作者单位	1.Minist Nat Resources, Inst Oceanog 3, Lab Ocean & Coast Geol, Xiamen 361005, Peoples R China 2.Fujian Prov Key Lab Marine Phys & Geol Proc, Xiamen 361005, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所
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.