The feasibility of using a pyrite standard to calibrate the sulfur isotope ratio of marcasite during SIMS analysis

Li, Rucao; Wang, Xiao Lei; Guan, Yue; Gu, Jing; Tian, Lanlan

doi:10.1039/d3ja00009e

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…Because matrix-matched standards for marcasite are scarce, in practice a pyrite standard is commonly used to calibrate the sulfur isotope ratios of marcasite 79,80 . This method has proven reliable by a recent study during SIMS analysis 81 , which yielded in situ δ 34 S values for marcasite consistent with the result determined using gas source isotope ratio mass spectrometry. Data reduction for LA-MC-ICP-MS analysis was conducted for a total of 72 targets using the ISO-Compass software 82 .…”

Section: Methodssupporting

confidence: 59%

Evidence for high-frequency oxygenation of Ediacaran shelf seafloor during early evolution of complex life

Jiao,

She,

Papineau

et al. 2023

Commun Earth Environ

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Increasing oxygenation of the early Ediacaran Ocean is thought to have been responsible for the emergence of early animals. Although geochemical studies have suggested periods of oceanic oxygenation in the Ediacaran, direct evidence for seafloor oxygenation has been lacking. Here, we report frequent occurrences of distinctive, sub-millimetric, and early diagenetic pyrite-marcasite rosettes in phosphorites from the lower Ediacaran Doushantuo Formation (Weng’an, South China). They typically consist of a nucleus of framboidal pyrite, a cortex of radiating marcasite blades intergrown with quartz, and a rim of second-generation pyrite, recording partial oxidative dissolution of pyrite and co-precipitation of marcasite and quartz. This inference is further supported by near-zero carbon isotope values of the host dolostone, similarly low sulfur isotope values for pyrite and marcasite, and evident Fe-isotope fractionation between marcasite and pyrite. Collectively, our findings reveal intermittent bottom-water and porewater oxygenation events, providing direct evidence of high-frequency oxygenation of Ediacaran continental shelves.

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Section: Methodssupporting

confidence: 59%

Evidence for high-frequency oxygenation of Ediacaran shelf seafloor during early evolution of complex life

Jiao,

She,

Papineau

et al. 2023

Commun Earth Environ

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show abstract

“…Because marcasite RMs are scarce, Li et al 237 evaluated the accuracy of using a pyrite (FeS 2 , isometric) as the RM to calibrate the SIMS measurement of sulfur isotope ratios in marcasite (FeS 2 , orthorhombic). The δ 34 S SIMS value for a natural marcasite sample (NJUMc-1) calibrated against a pyrite RM (UWPy-1) agreed within analytical uncertainties with the values obtained by IRMS, thus confirming the reliability of this procedure.…”

Section: Analysis Of Geological Materialsmentioning

confidence: 99%