δ13C, δ18O, and Triple Oxygen Isotopes of Benthic Microbial Carbonates from Perennially Ice-Covered Lake Fryxell, Antarctica ...
Microbial carbonates from Lake Fryxell, McMurdo Dry Valleys, Antarctica show slight (~0-3‰) enrichment in 13C, likely due to preferential uptake of 12C by metabolically-active microbes. Carbonate δ18O is highly variable, with a range of ~24‰ across all samples. Large differences in δ18O can be found...
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| Format: | Dataset |
| Language: | English |
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Interdisciplinary Earth Data Alliance (IEDA)
2022
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| Online Access: | https://dx.doi.org/10.26022/ieda/112383 https://ecl.earthchem.org/view.php?id=2383 |
| Summary: | Microbial carbonates from Lake Fryxell, McMurdo Dry Valleys, Antarctica show slight (~0-3‰) enrichment in 13C, likely due to preferential uptake of 12C by metabolically-active microbes. Carbonate δ18O is highly variable, with a range of ~24‰ across all samples. Large differences in δ18O can be found at subsampling sites only hundreds of microns to a few millimeters apart. Triple oxygen isotopes suggest mixing of a modified marine fluid with lake waters in benthic pore spaces as a potential mechanism for this isotopic variability. ... |
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