Isotope Geochemistry of Marine Sediments and Paleoclimate Reconstruction
This community reconstructs Earth's past climate, ocean chemistry, and biological evolution by analyzing the isotopic and elemental signatures preserved in marine sediments and carbonate rocks.
The work centers on measuring stable isotope fractionation (carbon, oxygen, sulfur) and trace element concentrations in marine sediments, carbonates, and organic matter. Researchers frequently examine specific geological basins in China, such as the Sichuan Basin, and major ocean basins like the Pacific and Atlantic. Key applications include dating mass extinction events, tracing anoxic ocean conditions, and modeling past atmospheric CO2 levels and glacial cycles. The methodology relies heavily on clumped isotope thermometry and rare earth element patterns to distinguish between biological, chemical, and physical processes that shaped the geological record.
The community is most heavily weighted toward Carbon research, where it represents 1.1% of all tracked Carbon papers, and Iron research, where it accounts for 1.6% of all tracked Iron papers. It also holds a significant share of Strontium research, comprising 3.8% of that element's total tracked output.
The community comprises 52,258 papers, published primarily in Geochimica et Cosmochimica Acta, Chemical Geology, and Earth and Planetary Science Letters.
Recent work continues to focus on the geochemical drivers of past biodiversity crises, such as the Late Ordovician mass extinction, and the role of heavy metal toxicity in these events. Other recent studies examine the paleoenvironmental controls on reservoir heterogeneity in shale formations and the biogeochemical cycling of nutrients in glacial systems.