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In situ rare earth element analysis of a lower Cambrian phosphate nodule by LA-ICP-MS
Ye, Yun-Tao1; Wang, Hua-Jian1; Wang, Xiao-Mei1; Zhai, Li-Na2; Wu, Chao-Dong3,4; Zhang, Shui-Chang1
Corresponding AuthorWang, Hua-Jian(
AbstractRare earth elements (REE) in marine minerals have been widely used as proxies for the redox status of depositional and/or diagenetic environments. Phosphate nodules, which are thought to grow within decimetres below the sediment-water interface and to be able to scavenge REE from the ambient pore water, are potential archives of subtle changes in REE compositions. Whether their REE signals represent specific redox conditions or they can be used to track the overlying water chemistry is worth exploring. Through in situ laser ablation - inductively coupled plasma - mass spectrometry (LA-ICP-MS), we investigate the REE compositions of a drill-core-preserved phosphate nodule from the lower Cambrian Niutitang Formation in the Daotuo area, northeastern Guizhou Province, South China. REE distributions of the nodule show concentric layers with systematic decreases in Ce anomalies (Ce/Ce*) from the core to the rim. The lowest Ce/Ce* appears in the outer rim where REE concentrations are relatively high. These results are interpreted to reflect REE exchange with pore water at a very early stage or bathymetric variation during apatite precipitation. The origin of the shale-normalized middle REE (MREE) enrichment in our sample is less constrained. Possible driving factors include preferential MREE substitution for Ca in the apatite lattice, degradation of organic matter and deposition beneath a ferruginous zone. Although speculative, the last possibility is consistent with the chemically stratified model for early Cambrian oceans, in which dynamic fluctuations of the chemocline provided an ideal depositional context for phosphogenesis.
KeywordCarbonate fluorapatite cerium anomaly MREE enrichment stratified ocean Niutitang Formation
Indexed BySCI
Funding ProjectNational Key Research and Development Program of China[2017YFC0603101] ; National Science and Technology Major Project of the Ministry of Science and Technology of China[2016ZX05004001] ; National Natural Science Foundation of China[41530317] ; National Natural Science Foundation of China[41872125] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA14010101] ; Scientific Research and Technological Development Project of CNPC[2016A-0200]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000631520600010
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorWang, Hua-Jian
Affiliation1.China Natl Petr Corp, Key Lab Petr Geochem, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
3.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Minist Educ, Beijing 100871, Peoples R China
4.Peking Univ, Inst Oil & Gas, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Ye, Yun-Tao,Wang, Hua-Jian,Wang, Xiao-Mei,et al. In situ rare earth element analysis of a lower Cambrian phosphate nodule by LA-ICP-MS[J]. GEOLOGICAL MAGAZINE,2021,158(4):749-758.
APA Ye, Yun-Tao,Wang, Hua-Jian,Wang, Xiao-Mei,Zhai, Li-Na,Wu, Chao-Dong,&Zhang, Shui-Chang.(2021).In situ rare earth element analysis of a lower Cambrian phosphate nodule by LA-ICP-MS.GEOLOGICAL MAGAZINE,158(4),749-758.
MLA Ye, Yun-Tao,et al."In situ rare earth element analysis of a lower Cambrian phosphate nodule by LA-ICP-MS".GEOLOGICAL MAGAZINE 158.4(2021):749-758.
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