GSA Annual Meeting in Indianapolis, Indiana, USA - 2018

Paper No. 113-5
Presentation Time: 9:00 AM-6:30 PM

NEW REFERENCE AND TRACER SOLUTIONS FOR INTEGRATING THE RE-OS SYSTEM INTO THE EARTHTIME INITIATIVE: UPDATES AND FUTURE PLANS


ROONEY, Alan D.1, LI, Yang1, CREASER, Robert A.2 and SELBY, David3, (1)Department of Geology and Geophysics, 210 Whitney Avenue, New Haven, CT 06511, (2)Earth and Atmospheric Sciences, University of Alberta, 1-23 Earth Sciences Building, Edmonton, AB T6G2E3, Canada, (3)Department of Earth Sciences, University of Durham, Science Labs, Durham, DH1 3LE, United Kingdom

With its siderophilic, chalcophilic and organophilic behaviour, the rhenium and osmium (187Re-187Os) isotope system is ideally suited to tackle a range of questions in the fields of geochemistry and cosmochemistry. This has led to advances in our understanding of mantle-crust interactions; hydrocarbon and ore formation; the age of iron meteorites, rates of evolutionary change and extreme and long-lived (Myr) climate perturbations. Over the past three decades a series of innovations in chemical procedures and mass spectrometry has led to an increase in the number of laboratories routinely generating Re-Os data. In order to further improve precision and confidence in the system, we aim to follow the successful approaches of the U-Pb and Ar-Ar communities and integrate Re-Os within the EARTHTIME initiative. This work builds on and complements previous efforts to standardize Re-Os geochronology. Here we present the results from experiments to better determine the stoichiometry of Os salts used in the production of gravimetric reference and tracer solutions for a range of Re-Os geochronological and geochemical applications. These and additional on-going efforts e.g., improved data reduction protocols and inter-calibration experiments will pave the way for the Re-Os chronometer to more fully join the EARTHTIME initiative and better serve the geoscience community.