The 18 O/ 16 O Ratio of 2-Billion-Year-Old Seawater Inferred from Ancient Oceanic Crust
Abstract
An oxygen isotope profile of the 2-billion-year-old Purtuniq ophiolite overlaps with similar profiles of younger ophiolites and the modern oceanic crust. This overlap implies (i) that there was a similar style of seawater—ocean crust interaction during the past 2 billion years; (ii) that the oxygen isotope composition of early Proterozoic seawater was similar to the modern value; (iii) that early Proterozoic sea-floor spreading rates were similar to, or greater than, average modern rates; and (iv) that early Proterozoic carbonate rocks and cherts with low 18 O/ 16 O ratios do not reflect global-scale 18 O depletion of early Proterozoic oceans.
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Measurements find ancient δ18Oseawater ~0‰ in 2-Ga-old ophiolites, 3.8-Ga-old serpentine minerals, Archean pillow basalts, and kerogens in Archean cherts.
“However, measurements find ancient δ18Oseawater ~0‰ (Vienna standard mean ocean water) in 2-Ga-old ophiolites (232), 3.8-Ga-old serpentine minerals (185), Archean pillow basalts (233), and kerogens in Archean cherts (234).”
From The Archean atmosphere (2020) · cites this paper as [232]
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- Authors
- Holmden, C., & Muehlenbachs, K.
- Affiliations
- University of Alberta (CA)
- Venue
- Science
- Published
- 1993-03-19
- Volume
- 259
- Issue
- 5102
- Pages
- 1733-1736
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1968815179
- Cited by
- 77
- References
- 30
- Citations by year
- 2025: 4 · 2024: 4 · 2023: 2 · 2022: 4 · 2021: 6 · 2020: 5 · 2019: 4 · 2017: 2 · 2016: 1 · 2015: 3 · 2014: 4 · 2013: 4 · 2012: 2
- FWCI
- 2.01
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- oxygen isotopes, seawater, Proterozoic, oceanic crust, carbonate rocks, chert, paleoceanography
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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