Zinc, cadmium and sulfur isotope fractionation in a supergiant MVT deposit with bacteria

Li, Meng-Lun; Liu, Sheng‐Ao; Xue, Chunji; Li, Dandan

doi:10.1016/j.gca.2019.08.018

Cited by 30 publications

(8 citation statements)

References 107 publications

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“…Notably, hydrocarbon-bearing aqueous inclusions as well as solid bitumen are ubiquitously distributed in sphalerite-rich ores of the Jinding deposit 44 . Besides, extremely Cd-isotope fraction in sphalerite in the Jinding deposit has been attributed to the presence of bacterial metabolic Zn-carboxylate in hydrothermal uids 45 . The NPs observed are hosted in dissolution pores.…”

Section: Discussionmentioning

confidence: 99%

Supernormal enrichment of cadmium in sphalerite via coupled hydrothermal dissolution-reprecipitation process

Duan¹,

Wang

Hu³

et al. 2023

Preprint

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The supernormal enrichment of cadmium, as well as other critical elements are frequently observed in the sphalerite of sedimentary-hosted zinc deposits. However, the physico-chemical processes that are responsible for their mineralization is still poorly understood. Here we display a coupled dissolution-reprecipitation model that could explain the occurrence of cadmium from solid solutions up to several wt.%, sulfide nanoparticles, and independent mineral inclusions in sphalerite. The selective dissolution by oxidative acidic fluids causes depletion of zinc and concentration of cadmium in the lattice of primarily formed sphalerite, especially at interface of structural defects, such as low-angle tilt boundaries. Further dissolution triggers reprecipitation of cadmium-poor sphalerite nanocrystals as relics, followed by deposition of amorphous cadmium-rich sulfide nanoparticles as fillings in dissolution pores by reaction between cadmium ions and released reduced sulfur from sphalerite lattice. The cadmium is derived from both dissolution of primary Cd-rich sphalerite and re-supply by highly-evolved oxidative acidic fluid rich in cadmium. Growth and/or passivation of these amorphous nanoparticles finally forms greenockite blebs and/or nanocrystals in sphalerite. This model provides insights for critical-element redistribution and mineralization via hydrothermal processes. Similar mechanisms may also have broad implications in synthesis of sulfide nanomaterials used in green energy technologies.

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Section: Discussionmentioning

confidence: 99%

Supernormal enrichment of cadmium in sphalerite via coupled hydrothermal dissolution-reprecipitation process

Duan¹,

Wang

Hu³

et al. 2023

Preprint

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“…BSR usually takes place at 60-80 °C (Machel, 1989), although its occurrence at 110 °C has also been reported (Jørgenson et al 1992). BSR commonly produces a wide δ 34 S VCDT range due to the large isotopic fractionation (15-66‰) between sulphate and sulphide (Rees, 1973;Leach et al 2005;Basuki et al 2008;Sim et al 2011;Li et al 2019). In contrast, TSR (occur at 150-350 °C) produces a relatively narrow range for sulphur isotopic fractionation, yielding <15‰ in the presence of organic matter (Ohmoto, 1972;Ohmoto & Rye 1979;Worden et al 1995;Wang et al 2018).…”

Section: Source Of Sulphur and Mechanisms Of Sulphide Depositionmentioning

confidence: 99%

Geology, fluid inclusions and C−O−S−Pb isotopic compositions of the Chahmileh Pb-Zn deposit, Central Iran: Implications for ore genesis

Mehrabi,

Chaghaneh,

Tale Fazel

et al. 2023

Geol. Mag.

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The Chahmileh Pb–Zn deposit, located northwest of the Central Iran Zone, is a sediment-hosted Pb–Zn deposit in the ‘Yazd-Anarak Metallogenic Belt’. It is hosted in Middle Triassic carbonate rocks and is mainly controlled by NW-trending faults. The main ore minerals are galena and sphalerite with minor chalcopyrite, pyrite, and quartz, dolomite, along with minor calcite and baryte as gangue minerals. Cerussite, hemimorphite, wulfenite, mimetite, smithsonite, malachite and iron oxy-hydroxides are the main non-sulphide ore minerals. The main styles of mineralization are vein-veinlet, breccia, disseminated and replacement in association with silicification and dolomitization. Microthermometry of fluid inclusions in dolomite and quartz indicates that the ore precipitated from a warm to hot basin-derived saline fluid. Dolomite samples have δ13CVPDB and δ18OVSMOW values of −0.99 to +1.99‰ and +20.74 to +25.48‰, respectively, and are plotted in the marine carbonate rocks field. These isotopic values suggest that CO2 in the hydrothermal fluids mainly originated from marine carbonate rock. The δ34S values range from +6.3 to +8.2‰ for galena, +5.9 to +6.2‰ for sphalerite, +1.4 to +3.4‰ for chalcopyrite and +15.0 to +17.4‰ for bayite are compatible with a predominant thermochemical sulphate reduction process, and with sulphur sourced from Triassic seawater. Galena samples have a homogeneous Pb isotopic composition that is indicative of a continental crustal reservoir as the main source of lead and probably for the other ore metals. Based on geology, mineralogy, texture and fluid characteristics, the Chahmileh deposit is classified as a carbonate-hosted Mississippi Valley-type deposit.

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“…Recently, MISs have become a popular strategy in geological and environmental studies. In order to obtain the isotopic composition of multiple elements of interest, the common protocol is to separate each fraction by an independent procedure, 10,11 which has shown some limitations, such as poor efficiency, high time consumption, and the need for large samples, making it unsuitable for rare samples ( e.g. , meteorite, lunar soil and atmospheric aerosol samples).…”

Section: Introductionmentioning

confidence: 99%

One-step separation of Cu, Fe, Zn and Cd and isotope ratio analysis by MC-ICP-MS for geological samples

Xing

et al. 2022

Anal. Methods

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Zinc, cadmium and sulfur isotope fractionation in a supergiant MVT deposit with bacteria

Cited by 30 publications

References 107 publications

Supernormal enrichment of cadmium in sphalerite via coupled hydrothermal dissolution-reprecipitation process

Supernormal enrichment of cadmium in sphalerite via coupled hydrothermal dissolution-reprecipitation process

Geology, fluid inclusions and C−O−S−Pb isotopic compositions of the Chahmileh Pb-Zn deposit, Central Iran: Implications for ore genesis

One-step separation of Cu, Fe, Zn and Cd and isotope ratio analysis by MC-ICP-MS for geological samples

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