THE PROVENANCE OF GLACIAL TILL DEPOSITED IN ONG VALLEY, CENTRAL TRANSANTARCTIC MOUNTAINS DETERMINED BY LA-ICP-MS OF DETRITAL ZIRCON
To date, a total of 479 zircon grains have been extracted from bulk sedimentary samples. Cathodoluminescence imaging of the grains shows a diversity of zoning, from broad to weak internal zoning to simple oscillatory zone internal structures. LA–ICP–MS data is being reduced using Glitter software for U/Pb analysis, and preliminary results indicate that the range of U/Pb ages stretch from 400 Ma to 3.2 Ga. Initial analyses also suggest that the U/Pb ages of the detrital zircon cluster around three peaks at 570 Ma, 1.4 Ga and 2.6 Ga.
The analysis of detrital zircon from Ong Valley has not been completed before and offers us an opportunity to share unique information that will substantiate the findings of other geologists and glaciologists. Our analyses will provide us with the information necessary to compare previous periods of glacial change, supporting the international effort strongly focused on understanding the glacial change we are experiencing today. Similarly, we’re excited to expand the geographic contribution of combined cosmogenic nuclide exposure dates and provenance data beyond the few Antarctic regions where it has been applied.