Sulfur geochemistry and microbial sulfate reduction during low-temperature alteration of uplifted lower oceanic crust: Insights from ODP Hole 735B

Alford, Susan E.; Alt, Jeffrey C; Shanks, Wayne C.

doi:10.1016/j.chemgeo.2011.05.005

Cited by 16 publications

(20 citation statements)

References 75 publications

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“…Acid-volatile sulfide (AVS) and Chromium-reducible sulfide (CRS) were extracted from sediment samples preserved in ZnAc (3mL, 20%) following a sequential extraction procedure modified from Alford et al, 2011 [3]. Highly reactive Fe 3+ oxide concentrations were measured using an ascorbic acid digestion following Sivan et al, 2011 [4].…”

Section: Supplementary Datamentioning

confidence: 99%

Geochemical evidence for cryptic sulfur cycling in salt marsh sediments

Mills

Antler

Turchyn

2016

Earth and Planetary Science Letters

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Section: Supplementary Datamentioning

confidence: 99%

Geochemical evidence for cryptic sulfur cycling in salt marsh sediments

Mills

Antler

Turchyn

2016

Earth and Planetary Science Letters

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“…Alternatively, sulfate reducers could have grown autotrophically, using H 2 from fl uid-rock interaction as their energy source (cf. Alford et al, 2011).…”

Section: Discussionmentioning

confidence: 95%

Sulfur isotope evidence for a Paleoarchean subseafloor biosphere, Barberton, South Africa

McLoughlin

Grosch

Kilburn

et al. 2012

Geology

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The Archean sub-seafl oor has been proposed as an environment for the emergence of life, with septate clusters of titanite microtextures in pillow lava rims argued to be the earliest traces of microbial microboring. Here we use nanoscale secondary ion mass spectrometry (NanoSIMS) to test possible geochemical traces of life in ca. 3.45 Ga pillow lavas of the Barberton Greenstone Belt, South Africa. Sulfi de inclusions in the titanite microtextures record strongly negative sulfur isotope fractionations of δ 34 S VCDT -39.8‰ to -3.2‰ (VCDT-Vienna Canyon Diablo Troilite). These represent the largest range and most negative δ 34 S values so far reported from the Archean, and are consistent with an early biogenic origin for the sulfi des. Extensive in situ elemental mapping did not fi nd any organic linings associated with the microtextures, despite the high spatial resolution and sensitivity of the NanoSIMS. The absence of organic linings thus excludes a key line of evidence previously used to support the biogenicity of the microtextures. In contrast, in situ sulfur isotope analysis of basalt-hosted sulfi des provides an alternative approach to investigating the existence and nature of an Archean subseafl oor biosphere.

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“…Texture and chemical composition studies indicate that microbial processes are involved in the alteration of basaltic glass and rocks (Giovannoni et al, 1996;Fisk et al, 1998;Torsvik et al, 1998;Furnes et al, 2001aFurnes et al, ,b, 2002Furnes et al, , 2006Bach and Edwards, 2003). Concentration, speciation, and isotopic fractionation of sulfur also provide evidence of a subsurface biosphere in ridge flank basement (Rouxel et al, 2008;Alford et al, 2011;Alt and Shanks, 2011). However, while rock cores provide direct samples of surface-associated microbial communities, core recovery is generally poor.…”

Section: Introductionmentioning

confidence: 91%