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首页> 外文期刊>Chemical geology >Development of in situ sulfur four-isotope analysis withmultiple Faraday cup detectors by SIMS and application to pyrite grains in a Paleoproterozoic glaciogenic sandstone
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Development of in situ sulfur four-isotope analysis withmultiple Faraday cup detectors by SIMS and application to pyrite grains in a Paleoproterozoic glaciogenic sandstone

机译：利用SIMS开发多个法拉第杯探测器的原位硫四同位素分析方法，并将其应用于古元古代生釉砂岩中的黄铁矿晶粒中

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An in situ sulfur four-isotope analysis technique with multiple Faraday cup detectors by ion microprobe was developed and applied to detrital pyrite grains in ~2.4 Ga glaciogenic sandstone fromtheMeteorite BoreMember of the Turee Creek Group, Western Australia. Data are standardized with the UWPy-1 pyrite standard (δ~(34)S = 16.04 ± 0.18‰, Δ~(33)S = ?0.003 ± 0.009‰, and Δ~(36)S = ?0.21 ± 0.24‰, 2 SD) whose sulfur four isotopes were newly determined by gas-source mass spectrometry. Typical reproducibility at two standard deviations (2 SD) of spot-to-spot analyses of standard UWPy-1 pyrite with a primary beam size of ~20 μm were ±0.23, ±0.05, and ±0.86‰ for δ~(34)S, Δ~(33)S, and Δ~(36)S, respectively. The measured ~(36)S/~(32)S ratio [1 / (6641 ± 27)] is approximately 19‰ lower than the published ratio for VCDT, and we propose a revision of the ~(36)S abundance in VCDT. Pyrite grains in ~2.4 Ga glaciogenic sandstone have wide ranging sulfur isotope ratios (?32.7 to 13.5 for δ~(34)S, ?3.03 to 11.66 for Δ~(33)S, and?9.7 to 4.6 for Δ~(36)S, respectively). Somepyrite grains are zoned in δ~(34)S valueswithin a grain. Sulfur isotope ratios of most pyrite grains are distributed along a line with slope = ?0.9 for Δ~(33)S vs. Δ~(36)S, suggesting that pyrite grains mostly derived from a limited range of source rocks and near-surface sulfur reservoirs. One pyrite aggregate has a distinct texture fromother pyrite grains in the same sandstone, and yields a significant mass-independent deficit in ~(36)S with a small excess in ~(33)S (Δ~(36)S/Δ~(33)S ~?4‰). This is used to suggest that this grain authigenically formed by biological activity during or after sedimentation. Thiswork demonstrates that the use of multiple Faraday cup detectors provides improved accuracy and precision for in situ sulfur fourisotope analysis with secondary ion mass spectrometry.
机译：开发了一种采用离子微探针的带有多个法拉第杯探测器的原位硫四同位素分析技术，并将其应用于来自西澳大利亚Turee Creek集团陨石孔成员的〜2.4 Ga致冰性砂岩中的碎屑黄铁矿晶粒。数据以UWPy-1黄铁矿标准标准化（δ〜（34）S = 16.04±0.18‰，Δ〜（33）S =？0.003±0.009‰，Δ〜（36）S =？0.21±0.24‰， 2 SD），其硫四个同位素是通过气源质谱法新测定的。对于δ〜（34）S，一次光束大小约为20μm的标准UWPy-1黄铁矿的点对点分析在两个标准偏差（2 SD）下的典型重现性分别为±0.23，±0.05和±0.86‰ ，Δ〜（33）S和Δ〜（36）S。测得的〜（36）S /〜（32）S比[1 /（6641±27）]比VCDT的公布比率低约19‰，我们建议对VCDT中〜（36）S丰度进行修订。 。 〜2.4 Ga冰川成因砂岩中的黄铁矿晶粒具有宽范围的硫同位素比（δ〜（34）S为？32.7至13.5，Δ〜（33）S为？3.03至11.66，Δ〜（36）为？9.7至4.6 S）。硫铁矿晶粒在晶粒内以δ〜（34）S值划分。对于Δ〜（33）S与Δ〜（36）S，大多数黄铁矿晶粒的硫同位素比沿斜率=？0.9的线分布，这表明黄铁矿晶粒主要来源于有限范围的烃源岩和近地表硫磺储层。在相同的砂岩中，一种黄铁矿聚集体与其他黄铁矿晶粒具有明显的织构，并且在〜（36）S中产生明显的质量无关的赤字，而在〜（33）S中产生少量过量（Δ〜（36）S /Δ〜（ 33）S〜？4‰）。这表明该颗粒是在沉积过程中或沉积后由生物活性真实形成的。这项工作表明，使用多个法拉第杯检测器可通过次级离子质谱法为原位硫四同位素分析提供更高的准确性和精密度。

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