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Title: Sulfur isotope analysis of microcrystalline iron sulfides using secondary ion mass spectrometry imaging: Extracting local paleo-environmental information from modern and ancient sediments

Journal Article · · Rapid Communications in Mass Spectrometry
DOI:https://doi.org/10.1002/rcm.8375· OSTI ID:1612250
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [4];  [1];  [1]
  1. Washington Univ., St. Louis, MO (United States)
  2. Washington Univ., St. Louis, MO (United States); Univ. of California, Santa Barbara, CA (United States)
  3. Johns Hopkins Univ., Baltimore, MD (United States)
  4. Univ. of Southern California, Los Angeles, CA (United States)

Rationale: Sulfur isotope ratio measurements of bulk sulfide from marine sediments have often been used to reconstruct environmental conditions associated with their formation. In situ microscale spot analyses by secondary ion mass spectrometry (SIMS) and laser ablation multiple-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) have been utilized for the same purpose. However, these techniques are often not suitable for studying small (≤10 μm) grains or for detecting intra-grain variability. Methods: In this work, we present a method for the physical extraction (using lithium polytungstate heavy liquid) and subsequent sulfur isotope analysis (using SIMS; CAMECA IMS 7f-GEO) of microcrystalline iron sulfides. SIMS sulfur isotope ratio measurements were made via Cs+ bombardment of raster squares with sides of 20–130 μm, using an electron multiplier (EM) detector to collect counts of 32S- and 34S- for each pixel (128 × 128 pixel grids) for between 20 and 960 cycles. Results: The extraction procedure did not discernibly alter pyrite grain-size distributions. The apparent inter-grain variability in 34S/32S in 1–4 μm-sized pyrite and marcasite fragments from isotopically homogeneous hydrothermal crystals was ~ ±2‰ (1σ), comparable with the standard error of the mean for individual measurements (≤ ±2‰, 1σ). In contrast, grain-specific 34S/32S ratios in modern and ancient sedimentary pyrites and marcasites can have inter- and intra-grain variability >60‰. The distributions of intra-sample isotopic variability are consistent with bulk 34S/32S values. Conclusions: SIMS analyses of isolated iron sulfide grains yielded distributions that are isotopically representative of bulk 34S/32S values. Populations of iron sulfide grains from sedimentary samples record the evolution of the S-isotopic composition of pore water sulfide in their S-isotopic compositions. These data allow past local environmental conditions to be inferred.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); American Chemical Society
Grant/Contract Number:
SC0014613; 57548-ND2
OSTI ID:
1612250
Journal Information:
Rapid Communications in Mass Spectrometry, Vol. 33, Issue 5; ISSN 0951-4198
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (1)

An improved femtosecond laser‐ablation fluorination method for measurements of sulfur isotopic anomalies (∆ 33 S and ∆ 36 S) in sulfides with high precision
  • Velivetskaya, Tatiana A.; Ignatiev, Alexander V.; Yakovenko, Victoria V.
  • Rapid Communications in Mass Spectrometry, Vol. 33, Issue 22 https://doi.org/10.1002/rcm.8528
journal October 2019