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A 3,800-million-year isotopic record of life from carbon in sedimentary rocks

An increased ratio of 12C to 13C, an indicator of the principal carbon-fixing reaction of photosynthesis, is found in sedimentary organic matter dating back to almost four thousand million years…
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Carbon isotopes as biogeochemical recorders of life over 3.8 Ga of Earth history: evolution of a concept

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Isotopic inferences of ancient biochemistries - Carbon, sulfur, hydrogen, and nitrogen

In processes of biological incorporation and subsequent biochemical processing sizable isotope effects occur as a result of both thermodynamic and kinetic fractionations which take place during…

Precambrian sedimentary carbonates: carbon and oxygen isotope geochemistry and implications for the terrestrial oxygen budget☆

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Carbon isotope geochemistry of the Precambrian Lomagundi carbonate province, Rhodesia

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Environmental Evolution of the Archean-early Proterozoic Earth

This chapter discusses the changes that may have occurred in several biologically important aspects of the environment that are likely to have changed during the Archean-Early Proterozoic Earth.

87Sr86Sr in Late Proterozoic carbonates: evidence for a “mantle” event at ∼900 Ma ago

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Enriched Subcontinental Upper Mantle beneath Southern India: Evidence from Pb, Nd, Sr, and C-O Isotopic Studies on Tamil Nadu Carbonatites

The major, trace and rare earth element distributions as well as the contrast to the lead data, the Nd–Sr isotope data show a clear Nd, Sr, Pb, C and O isotope geochemistry of four carbonatite…
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Carbon isotope geochemistry of the 3.7 × 109-yr-old Isua sediments, West Greenland: implications for the Archaean carbon and oxygen cycles

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New C isotope stratigraphy from southwest China: Implications for the placement of the Precambrian-Cambrian boundary on the Yangtze Platform and global correlations

A high-resolution C isotope profile from a fossiliferous section spanning the Precambrian-Cambrian (PC-C) boundary on the Yangtze Platform, southwest China, is used to constrain C isotope…
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