Strontium ratios have varied in the world’s oceans through time as a result of fluctuations in strontium type and availability, often resulting from weathering of continental materials as well as volcanic activity at the mid-oceanic ridge. Such variations are recorded in oceanic sediment as a result of the precipitation of minerals from seawater, which has been used as a basis for the 87Sr/86Sr marine curve.
Paleontology / Paleoclimatology
- Company Updates
- Sr Isotopes
- U-Th Dating
- Lead Isotopes
- Boron Isotopes
- Sr-Nd-Hf Isotopes
- Hydrology / Environmental Science
- Paleontology / Paleoclimatology
Before a time series of climate variability can be developed, the coral growth bands must first be dated. Corals can be dated using radiocarbon dating, U-Th dating and/or Sr-Sr dating.
Isobar Science and Beta Analytic’s webinar on sediments focuses on dating & environmental reconstructions. This complimentary webinar takes place on December 2, 2021 at 12:00 PM Eastern Time (US and Canada).
Sediments used for climate and environmental reconstructions come in many different forms (including lacustrine, marine, peat, terrestrial and aeolian deposits) and can be characterized by their grain size, shape, sedimentary facies, chemical and biological composition and accumulation/sedimentation rate.
U-Th dating can be used to date various sample types including cave deposits/speleothems, corals, shells, bones and carbonate layers in sedimentary successions.
Isobar Science and Beta Analytic’s bones webinar focuses on C-14 and U-Th methods for bone samples. Topics include optimal sample types, common issues, and how to prepare bone samples for isotopic analysis.
Paleoclimate archives are generally dated using two main methods: radiocarbon and uranium-thorium dating. 14C dating tends to be more accurate, however, it can only be used on samples that are less than around 50,000 years old. Whereas U-Th dating can be used for the last 500,000 years.
Isobar Science and Beta Analytic’s paleclimatology webinar focuses on the importance of C-14 and U-Th dating in paleoclimatology, and how archives can be used to reconstruct past climate.
The origin and movement of atmospheric dust can be estimated by analysing the geochemistry of dust collected directly from the atmosphere or from the dust layers found within ice cores or lacustrine and ocean sediment cores.
Shells, corals and other carbonates are widely used in order to assess variability in climate and environmental conditions in time. A variety of stable and radioactive isotopes can be used to date these samples and provide further information on environmental context during their lifespan.