Cerium stable isotope ratios in ferromanganese deposits and their potential as a paleo-redox proxy

Nakada, Ryoichi; Takahashi, Yoshio; Tanimizu, Masaharu

doi:10.1016/j.gca.2016.02.025

Cited by 44 publications

(41 citation statements)

References 37 publications

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“…In this regard, a novel and potentially valuable tool for moving forward may be the use of Ce stable isotopes, which in combination with Ce anomalies, have recently been shown to provide a more nuanced understanding of redox conditions in modern hot springs and ferromanganese crusts, and hence, may be favourable for studies of strata pre-and contemporaneous to the GOE (Nakada et al, 2016). Additionally, it is important to note that Ce anomalies need not develop solely within the water column of a basin.…”

Section: Iron Formations As Tracers Of Seawater Redoxmentioning

confidence: 99%

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Konhauser

Planavsky

Hardisty

et al. 2017

Earth-Science Reviews

380

257

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Section: Iron Formations As Tracers Of Seawater Redoxmentioning

confidence: 99%

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Konhauser

Planavsky

Hardisty

et al. 2017

Earth-Science Reviews

380

257

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“…Chromium isotopes are also increasingly used as a paleo-redox proxy (Crowe et al, 2013;Frei et al, 2009;Planavsky et al, 2014;Gilleaudeau et al, 2016;Frei et al, 2016). Other redox-sensitive elements such as Ce and U (Bau and Alexander, 2009;Bau and Dulski, 1996;Kamber et al, 2014;Kendall et al, 2013;Nakada et al, 2016;Partin et al, 2013;Schier et al, 2018;Viehmann et al, 2016Viehmann et al, , 2015 or Mo (Anbar et al, 2007;Asael et al, 2013;Duan et al, 2010;Kurzweil et al, 2015;Voegelin et al, 2010) are also used as geochemical proxies to evaluate the evolution of the redox level of the Earth's surface environments throughout geological history. However, biogenic ligands were probably produced since at least the Mesoproterozoic (Neaman, 2005;Raven, 1995).…”

Section: Implications For (Paleo-)environmental Studiesmentioning

confidence: 99%

Mobilization and isotope fractionation of chromium during water-rock interaction in presence of siderophores

Kraemer

Viehmann

Bau

2019

Applied Geochemistry

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Chromium mobilization and isotope fractionation during water-rock interaction in presence of the biogenic siderophore desferrioxamine B (DFOB) was studied with batch leaching experiments on chromitite and other igneous oxide and silicate rocks. Siderophores are a group of organic ligands synthesized and excreted by bacteria, fungi and plants to enhance the bioavailability of key nutrients like Fe. However, the DFOB siderophore also has a strong affinity for complexation with other metals such as Cr, U and rare earth elements. Here we show that leaching of rocks in the presence of the hydroxamate siderophore DFOB significantly increased the mobilization of Cr from all investigated rocks and caused an enrichment of the heavier 53 Cr isotope in leachates from chromitite (δ 53 Cr leach = +0.15 ± 0.087‰ to +2.14 ± 0.042 ‰) and from altered silicate rock (δ 53 Cr leach = +0.48 ± 0.07‰). In contrast, stable isotope fractionation of Cr was not observed in DFOB leachates of pristine silicate and low-Cr oxide rocks. Leaching in the presence of citric acid significantly enhanced Cr mobility, but did not result in fractionation of Cr isotopes. Chromium isotope fractionation is used in geochemistry as a quantitative proxy for oxidative weathering, because Cr(III) is oxidized *Revised manuscript with no changes marked to Cr(VI) in presence of MnO 2 and the associated Cr isotope fractionation is commonly linked to the presence of oxygen in the atmosphere. Our findings indicate that the presence of specific biogenic ligands with a high affinity for Cr are also able to fractionate Cr isotopes. The presence of biomolecules like siderophores during weathering, hydrothermal alteration or during mineral precipitation, therefore, may put constraints on the applicability of certain trace metals and their isotopes as redox proxies in modern and past environments. The results of our study also suggest that siderophores may have a high potential for (bio)remediation of Cr-contaminated sites and detoxification of contaminated natural waters. 1. Introduction Chromium occurs as Cr(III) and Cr(VI) redox species in the natural environment. While the former is rather immobile and non-toxic, the latter is mobile and considered toxic (Fendorf, 1995). Under present-day atmospheric conditions, Cr(VI) is the thermodynamically most stable redox species of Cr and, hence, Cr mobility is significantly increased during oxidative weathering. The mobile anionic species are chromate, CrO 4 2-, and bichromate, HCrO 4-. The aqueous Cr(VI) species solubilised during weathering enters streams, rivers, and ultimately the ocean (Oze et al., 2007). Chromium is used in a variety of technological applications such as electroplating, dyeing and tanning, and as such, significant quantities are introduced into the environment as a contaminant. The mobile form, Cr(VI), is considered carcinogenic (Kortenkamp et al., 1996) and its input into groundwater and surface water may have serious effects on flora and fauna. Hence, the remediation of Cr-contaminated soils and natur...

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“…The introduction of La-Ce geochronometer by Tanaka and Masuda [25] fo cused most of Ce isotopic studies in the following years towards radiogenic 138 Ce measurements [26][27][28][29][30][31][32], leaving stable isotope variations poorly investigated. However, recent works on this subject have produced interesting data and a promising opening of a new topic in REE geochemistry [33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

“…Based on studies of synthetic Fe,Mn-rich compounds [36], and on samples from natural ferromanganese deposits [37], the sensitivity of 142 Ce/ 140 Ce ratio to the redox conditions of the environment and the occurrence of a mass-dependent isotopic fractionation were reported. This has led the authors to suggest Ce stable isotopic compositions (δ 142 Ce) as a potential tool to investigate paleo-redox conditions alongside Δ 33 S, δ 56 Fe, δ 53 Cr, and Mo isotopes with the advantage of δ 142 Ce being useful to investigate recovery processes from anoxic to oxic conditions in the Phanerozoic.…”

Section: Introductionmentioning

confidence: 99%

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Cerium stable isotope analysis of synthetic and terrestrial rock reference materials by MC-ICPMS

Pourkhorsandi

Debaille

Jong

et al. 2021

Talanta

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Cerium is the most abundant rare earth element (REE) in the solar photosphere, CI chondrites, and the Earth. It has four main stable isotopes (masses: 136,138,140, and 142), with 138 Ce being the most studied species, used in geochronology and petrogenesis. In addition, more abundant 140 Ce and 142 Ce are suggested to be potentially applicable in geochemical investigations. In this work, we developed a modified four-step ion chromatography procedure for Ce chemical separation. Using a MC-ICPMS, we designed a cup configuration to measure 142 Ce/ 140 Ce ratio of the samples with an optimized Nd correction equation. A 0.03‰ (2SD) reproducibility was obtained for Ce Ames metal standard. We analyzed ten different igneous and one sedimentary geochemical reference materials. Mean δ 142 Ce range from −0.07 to 0.32‰. Most of the samples show a heavier Ce isotopic composition than the Ce Ames standard. The majority of rocks have a homogenous δ 142 Ce. The δ 142 Ce does not show any correlation with rock chemical composition including their Ce content or rock types. A carbonatite (SARM 40) has a mean δ 142 Ce of −0.07 ± 0.13‰ (2SD), lower than the other rocks, suggesting the possibility of a pronounced isotopic fractionation. Our work demonstrates the applicability of the developed methodology and the potential of Ce stable isotopes for future geochemical studies. Production of a larger database of δ 142 Ce values is required to obtain a clearer view on the similarities and differences between different geological material and explaining Ce stable isotope dynamics.

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Cerium stable isotope ratios in ferromanganese deposits and their potential as a paleo-redox proxy

Cited by 44 publications

References 37 publications

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Mobilization and isotope fractionation of chromium during water-rock interaction in presence of siderophores

Cerium stable isotope analysis of synthetic and terrestrial rock reference materials by MC-ICPMS

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