Coupled Fe and S isotope evidence for Archean microbial Fe(III) and sulfate reduction

Geology ◽  
2006 ◽  
Vol 34 (3) ◽  
pp. 153 ◽  
Author(s):  
Corey Archer ◽  
Derek Vance
Keyword(s):  
Sulfate Reduction ◽  
Isotope Evidence ◽  
S Isotope

Contrasting evolution of hydrothermal fluids in the PACMANUS system, Manus Basin: The Sr and S isotope evidence

Geology ◽  
2003 ◽  
Vol 31 (9) ◽  
pp. 805 ◽  
Author(s):  
S. Roberts ◽  
W. Bach ◽  
R.A. Binns ◽  
D.A. Vanko ◽  
C.J. Yeats ◽  
...  
Keyword(s):  
Hydrothermal Fluids ◽  
Isotope Evidence ◽  
Manus Basin ◽  
S Isotope

scholarly journals Effects of Iron and Nitrogen Limitation on Sulfur Isotope Fractionation during Microbial Sulfate Reduction

2012 ◽  
Vol 78 (23) ◽  
pp. 8368-8376 ◽  
Author(s):  
Min Sub Sim ◽  
Shuhei Ono ◽  
Tanja Bosak
Keyword(s):  
Nitrogen Fixation ◽  
Sulfate Reduction ◽  
Isotope Fractionation ◽  
Sulfur Isotope ◽  
Isotope Effects ◽  
Reducing Power ◽  
Sulfate Reducing ◽  
Microbial Sulfate Reduction ◽  
Sulfur Isotope Fractionation ◽  
S Isotope

ABSTRACTSulfate-reducing microbes utilize sulfate as an electron acceptor and produce sulfide that is depleted in heavy isotopes of sulfur relative to sulfate. Thus, the distribution of sulfur isotopes in sediments can trace microbial sulfate reduction (MSR), and it also has the potential to reflect the physiology of sulfate-reducing microbes. This study investigates the relationship between the availability of iron and reduced nitrogen and the magnitude of S-isotope fractionation during MSR by a marine sulfate-reducing bacterium, DMSS-1, aDesulfovibriospecies, isolated from salt marsh in Cape Cod, MA. Submicromolar levels of iron increase sulfur isotope fractionation by about 50% relative to iron-replete cultures of DMSS-1. Iron-limited cultures also exhibit decreased cytochromec-to-total protein ratios and cell-specific sulfate reduction rates (csSRR), implying changes in the electron transport chain that couples carbon and sulfur metabolisms. When DMSS-1 fixes nitrogen in ammonium-deficient medium, it also produces larger fractionation, but it occurs at faster csSRRs than in the ammonium-replete control cultures. The energy and reducing power required for nitrogen fixation may be responsible for the reverse trend between S-isotope fractionation and csSRR in this case. Iron deficiency and nitrogen fixation by sulfate-reducing microbes may lead to the large observed S-isotope effects in some euxinic basins and various anoxic sediments.

scholarly journals Sulfur isotope evidence of geochemical zonation of the Samoan mantle plume

2021 ◽  
Author(s):  
James Dottin ◽  
Jabrane Labidi ◽  
Matthew Jackson ◽  
James Farquhar
Keyword(s):  
Mantle Plume ◽  
Sulfur Isotope ◽  
Full Range ◽  
Primitive Mantle ◽  
Isotope Evidence ◽  
The Individual ◽  
Different Origins ◽  
Prior Hypothesis ◽  
Sulfur Isotope Data ◽  
S Isotope

<p>The radiogenic Pb isotope compositions of basalts from the Samoan hotspot suggest various mantle endmembers contribute compositionally distinct material to lavas erupted at different islands [1]. Basalts from the Samoan islands sample contributions from all of the classical mantle endmembers, including extreme EM II and high <sup>3</sup>He/<sup>4</sup>He components, as well as dilute contributions from the HIMU, EM I, and DM components. Here, we present multiple sulfur isotope data on sulfide extracted from subaerial and submarine whole rocks associated with several Samoan volcanoes—Malumalu, Malutut, Upolu, Savaii, and Tutuila—that sample the full range of geochemical heterogeneity at Samoa and allow for an assessment of the S-isotope compositions associated with the different mantle components sampled by the Samoan hotspot. We observe variable S concentrations (10-1000 ppm) and δ<sup>34</sup>S values (-0.29‰ to +4.84‰ ± 0.3, 2σ). The variable S concentrations likely reflect weathering, sulfide segregation and degassing processes. The range in δ<sup>34</sup>S reflects mixing between the primitive mantle and recycled components, and isotope fractionations associated with degassing. The majority of samples reveal Δ<sup>33</sup>S within uncertainty of Δ<sup>33</sup>S=0 ‰ ± 0.008, suggesting Δ<sup>33</sup>S is relatively well mixed within the Samoan mantle plume. Important exceptions to this observation include: (1) a negative Δ<sup>33</sup>S (-0.018‰ ±0.008, 2σ) from a rejuvenated basalt on Upolu island (associated with a diluted EM I component) and (2) a previously documented small (but resolvable) Δ<sup>33</sup>S values (up to +0.027±0.016) associated with the Vai Trend (associated with a diluted HIMU component) [2]. The variability we observed in Δ<sup>33</sup>S is interpreted to reflect contributions of sulfur of different origins and likely multiple crustal protoliths. Δ<sup>36</sup>S vs. Δ<sup>33</sup>S relationships suggest all recycled S is of post-Archean origin. The heterogeneous S isotope values and distinct isotopic compositions associated with the various compositional trends confirms a prior hypothesis; unique crustal materials are heterogeneously delivered to the Samoan mantle plume and compositionally influence the individual groups of islands.</p><p>[1] Jackson et al. (2014), <em>Nature; </em>[2] Dottin et al. (2020), <em>EPSL</em></p>

Re-Os and S isotope evidence for the origin of Platreef mineralization (Bushveld Complex)

2017 ◽  
Vol 214 ◽  
pp. 282-307 ◽  
Author(s):  
M. Yudovskaya ◽  
E. Belousova ◽  
J. Kinnaird ◽  
E. Dubinina ◽  
D.F. Grobler ◽  
...  
Keyword(s):  
Bushveld Complex ◽  
Isotope Evidence ◽  
S Isotope

Effect of Molybdate and Cell Growth on S-Isotope Fractionation During Bacterial Sulfate Reduction

2004 ◽  
Vol 21 (3) ◽  
pp. 207-219 ◽  
Author(s):  
Andrea Stögbauer ◽  
Supavadee Koydon ◽  
Zsolt Berner ◽  
Josef Winter ◽  
Doris Stüben
Keyword(s):  
Cell Growth ◽  
Sulfate Reduction ◽  
Isotope Fractionation ◽  
Bacterial Sulfate Reduction ◽  
S Isotope
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