A palaeotemperature curve for the Precambrian oceans based on silicon isotopes in cherts

  title={A palaeotemperature curve for the Precambrian oceans based on silicon isotopes in cherts},
  author={François Robert and Marc Chaussidon},
The terrestrial sediment record indicates that the Earth’s climate varied drastically in the Precambrian era (before 550 million years ago), ranging from surface temperatures similar to or higher than today’s to global glaciation events. The most continuous record of sea surface temperatures of that time has been derived from variations in oxygen isotope ratios of cherts (siliceous sediments), but the long-term cooling of the oceans inferred from those data has been questioned because the… 

Warm Archean oceans reconstructed from oxygen isotope composition of early-life remnants

doi: 10.7185/geochemlet.1706 Deciphering the surface conditions on the Earth during Archean times (> 2.5 billion years ago – Ga) is crucial to constrain the conditions that promoted the development

Oxygen and hydrogen isotope evidence for a temperate climate 3.42 billion years ago

The results indicate that the Palaeoarchaean ocean was isotopically depleted relative to the modern ocean and far cooler than previously thought.

Palaeoclimatology: Evidence for hot early oceans?

It is suggested here that both isotope trends may be caused by variations in seawater isotope composition, rather than in ocean temperatures, and that the climate of the early Earth may have been temperate, as it is today.

The δ30Si peak value discovered in middle Proterozoic chert and its implication for environmental variations in the ancient ocean

There was a drastic decrease in silicon content and an increase in the δ30Si value in ocean water due to a temperature decrease and biological activity increase from the Archean to the middle Proterozoic, and after that period, the silicon content of the ocean was limited to a low level by a high degree of biological absorption.

Oxygen isotope composition of the Phanerozoic ocean and a possible solution to the dolomite problem

  • U. RybJ. Eiler
  • Geology, Geography
    Proceedings of the National Academy of Sciences
  • 2018
The fluxes of oxygen–isotope exchange associated with weathering and hydrothermal alteration reactions have remained stable throughout the Phanerozoic, despite major tectonic, climatic and biologic perturbations, which implies that a long-term feedback exists between the global rates of seafloor spreading and weathering.

The geologic history of seawater oxygen isotopes from marine iron oxides

Iron oxide precipitation experiments reveal a weakly temperature-dependent iron oxide–water oxygen isotope fractionation, suggesting that increasing seawater δ18O over time was the primary cause of the long-term rise in δ 18O values of marine precipitates.



High Archean climatic temperature inferred from oxygen isotope geochemistry of cherts in the 3.5 Ga Swaziland Supergroup, South Africa

New and compiled oxygen isotope data combined with the results of geological and sedimentological studies demonstrate that enclaves of synsedimentary to very early diagenetic cherts are widely

Silicon-isotope composition of diatoms as an indicator of past oceanic change

Silicon is essential for the growth of diatoms, a group of phytoplankton with opal (amorphous hydrated silica) shells. Diatoms largely control the cycling of silicon in the ocean and, conversely,

Another continental pool in the terrestrial silicon cycle

It is shown that quartz that precipitates as siliceous cements forms a strongly 30Si-depleted reservoir with isotopic values down to -5.7‰, a more negative value than any previously published for terrestrial samples, suggesting that quartz re-precipitation plays an important role in the biogeochemical cycle of silicon.

Methane and climate during the Precambrian era