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- W4304805162 abstract "New insight into the geochemistry of ancient environments can be gained through structural and chemical analyses of nanometer-scale features within minerals. Here, we present recent developments using atom probe tomography (APT) enabling direct visualization of nanoscale fluid inclusions trapped within pyrite (FeS2) and thereby chemical characterization of remnant seawater. Pyrite framboids (spherical clusters of nanocrystals) were sampled from the Middle Devonian Leicester Pyrite Member (New York). Scanning transmission electron microscopy shows low density features distributed within the pyrite (<4 nm in size). Three-dimensional chemical visualization and analysis by APT reveals these to be nanoscale fluid inclusions preserving the elemental signatures of the water column in which the framboids formed, as alkalis consistent with seawater including Na, K, Mg, and Ca are identified. Further, within the inclusions Mg/Ca is measured to be ∼0.6±0.2 – consistent with conditions for calcite-dominated seawater existing in the Middle Devonian. The results and approach developed in this study show the potential to reconstruct paleoenvironmental conditions from coupled elemental and structural analyses of nanoscale fluid inclusions." @default.
- W4304805162 created "2022-10-13" @default.
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- W4304805162 date "2022-12-01" @default.
- W4304805162 modified "2023-10-14" @default.
- W4304805162 title "Pushing the limits: Resolving paleoseawater signatures in nanoscale fluid inclusions by atom probe tomography" @default.
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- W4304805162 doi "https://doi.org/10.1016/j.epsl.2022.117859" @default.
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