Jesse Reimink Wins Young Author of the Year Award from the Journal of the Geological Society
Journal of the Geological Society selected Jesse Reimink, a postdoctoral associate at DTM, for their Young Author of the Year award for his paper titled "Dealing with discordance: a novel approach for analyzing U–Pb detrital zircon datasets."
Reimink received his Ph.D. in geochemistry from the University of Alberta in 2015. He is broadly interested in how the crust was formed, deformed, and recycled, particularly on the early Earth. His Ph.D. work was spent mapping within the remote Acasta Gneiss Complex in the Northwest Territories, Canada, an area widely regarded to contain the oldest known evolved crust on Earth. To investigate the formation of evolved crust through time, he employs a wide variety of radiogenic and stable isotope systems including zircon U-Pb, oxygen, and hafnium isotope systems as well as whole rock elemental signatures together with Nd and W isotope data.
The prize is given out annually at the Society's editorial board meeting at the Burlington House in London. The meeting, held this year on March 6, will be followed by an evening reception where the Young Author of the Year award will be presented to Reimink with a certificate and a Geological Society special publication of his choice.
Abstract: Detrital zircon U–Pb geochronology is a rapidly expanding and useful technique for addressing the sedimentary rock record. However, because of difficulties in evaluating discordant analyses, common in most datasets, a high proportion of results may be discarded. These analyses, if interpreted correctly, can provide valuable information regarding the deformation, alteration or metamorphism of the zircon population, as these events are all capable of producing U–Pb discordance. A novel modeling procedure permits analysis of probabilistic relationships within U–Pb datasets to deconvolve the age information present within discordant analyses by assessing the relative likelihood of potential discordia lines. Additionally, because we retrieve useful information from discordant data, a stricter filter can be used to assess concordance, increasing confidence in those distributions. The validity of this modeling method is demonstrated using two previously published cases from the Caledonide orogen were clearly discordant analyses exist. In the Southern Uplands of Scotland, these analyses indicate resetting of the U–Pb systematics in metasedimentary rocks in the Grampian orogen prior to Ordovician erosion and redeposition. In the second case, from the Greenland Caledonides, discordant data provide additional constraints on previously proposed in situ resetting during Scandian deformation and fluid flow events.
January 27, 2017
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