top

Corrigendum

Correction to: Geochemical Perspectives Letters 21, 7–12, doi: 10.7185/geochemlet.2209, published 21 March 2022.


Correction to the Quasi Simultaneous Arrival effect
After reviewing our work based on the suggestion of a careful reader, we have identified a miscalculation in the correction of the Quasi-Simultaneous Arrival (QSA) effect. This error affected the results presented in the article and was propagated to both the standard and sample data. The error has caused a slight change in the instrumental mass fractionation determination, resulting in a 2 ‰ shift in the corrected data. However, this correction remains negligible as corrected values remain within the error bars of each data. The average Δ_pyr values for Lake Atexcac and Cayo Coco Lagoon are 61.4 ± 18.3 ‰ and 59.1 ± 29.6 ‰ respectively, which is consistent with the equilibrium sulfate-sulfide fractionation observed in natural settings with low microbial sulfate reduction respiration rates. However, the data distribution has slightly changed, as shown in the corrected Figure 4. We have thoroughly reviewed the revised data and found that the conclusion drawn from the corrected results is consistent with the original article.

Full size image

Corrections have been made to the “Microbialitic Micropyrite Preserve Primary Isotopic Microbial Fractionation Signatures” section in the main text and to Figure 4, also the Sulfur Isotope Analyses by NanoSIMS section in the Supplementary Information (methods) and Tables S-4 and S-5. The corrected Figure 4 and text are shown below. The corrected Supplementary Information is also available for download at the online version of the original article.

Microbialitic Micropyrite Preserve Primary Isotopic Microbial Fractionation Signatures. In the first paragraph on page 11, the following sentence is now corrected to:

“Considering these hugely contrasting isotopic compositions of sulfate, micropyrites display surprisingly similar Δ_pyr values (i.e. Δ_pyr = δ³⁴S_SO4 − δ³⁴S_pyr) of 61.4 ± 18.3 ‰ and 59.1 ± 29.6 ‰ for Atexcac and Cayo Coco, respectively (Fig. 4).”

Sulfur Isotope Analyses by NanoSIMS (Methods) in the Supplementary Information. In the second paragraph the QSA correcting factor has been corrected:

“Using different aperture slits to produce variations of the secondary ion signal over primary current ratio on the standard, we determined a QSA correcting factor of 0.523 and 0.586 for ³⁴S/³²S ratio for each session consistent with the value of 0.69 previously published (Slodzian et al., 2004; Bontognali et al., 2012; Marin-Carbonne et al., 2018).

The caption to Table S-4 and columns describing ³⁴S/³²S measured, 1σ and the IMF have been corrected, as shown below:

Standards	δ34S true (‰)	34S/32S true	34S/32S measured	1σ	IMF
Session MNHN
UCLA	1.5	0.04423001	0.044448	7.37.10−5	1.0044
MAINE	−20.1	0.04327607	0.043424	7.18.10−6
Session EPFL
UCLA	1.5	0.04423001	0.04442	1.04.10−4	1.0140
MAINE	−20.1	0.04327607	0.44304	5.71.10−5

Table S-5 reporting Sulfur isotope compositions of framboidal and micropyrites has also been corrected and is available for download at the online version of this article. Download Table S-5 (xlsx)