The DOI matches its Crossref record; 37 of the 39 references it cites were found in a registry or an index.
Phosphate oxygen isotopic evidence for a temperate and biologically active Archaean ocean
Abstract
Oxygen and silicon isotope compositions of cherts and studies of protein evolution have been interpreted to reflect ocean temperatures of 55-85 degrees C during the early Palaeoarchaean era ( approximately 3.5 billion years ago). A recent study combining oxygen and hydrogen isotope compositions of cherts, however, makes a case for Archaean ocean temperatures being no greater than 40 degrees C (ref. 5). Ocean temperature can also be assessed using the oxygen isotope composition of phosphate. Recent studies show that (18)O:(16)O ratios of dissolved inorganic phosphate (delta(18)O(P)) reflect ambient seawater temperature as well as biological processing that dominates marine phosphorus cycling at low temperature. All forms of life require and concentrate phosphorus, and as a result of biological processing, modern marine phosphates have delta(18)O(P) values typically between 19-26 per thousand (VSMOW), highly evolved from presumed source values of approximately 6-8 per thousand that are characteristic of apatite in igneous rocks and meteorites. Here we report oxygen isotope compositions of phosphates in sediments from the 3.2-3.5-billion-year-old Barberton Greenstone Belt in South Africa. We find that delta(18)O(P) values range from 9.3 per thousand to 19.9 per thousand and include the highest values reported for Archaean rocks. The temperatures calculated from our highest delta(18)O(P) values and assuming equilibrium with sea water with delta(18)O = 0 per thousand (ref. 12) range from 26 degrees C to 35 degrees C. The higher delta(18)O(P) values are similar to those of modern marine phosphate and suggest a well-developed phosphorus cycle and evolved biologic activity on the Archaean Earth.
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“Combined O and H isotope ratios have suggested surface temperatures <40°C (52), while O isotopes in Archean phosphates have produced 26° to 35°C upper limits (53).”
From The Archean atmosphere (2020) · cites this paper as [53]
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Metadata
- Authors
- Blake, R. E., Chang, S. J., & Lepland, A.
- Affiliations
- Yale University (US)
- Tallinn University of Technology (EE)
- Corresponding author
- Blake, Ruth E.
- Venue
- Nature
- Published
- 2010-04
- Volume
- 464
- Issue
- 7291
- Pages
- 1029-1032
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W1964399673
- Cited by
- 230
- References
- 39
- Citations by year
- 2026: 8 · 2025: 13 · 2024: 19 · 2023: 14 · 2022: 16 · 2021: 13 · 2020: 19 · 2019: 18 · 2018: 18 · 2017: 14 · 2016: 14 · 2015: 12 · 2014: 11 · 2013: 20 · 2012: 11
- FWCI
- 8.76
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geological and Geochemical Analysis
- Keywords
- phosphate oxygen isotopes, Barberton Greenstone Belt, early life, marine phosphorus cycle, early Earth ocean chemistry, silicon isotopes, Precambrian sediments
- MeSH terms
- Africa, Southern, Apatites, Archaea, Marine Biology, Oceans and Seas, Oxygen Isotopes, Phosphates, Seawater, Silicon Dioxide, Temperature, Geologic Sediments, History, Ancient
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