New paper! Professor Hanika Rizo, in collaboration with scientists from the University of Wisconsin-Madison (US), co-authors publication in Earth and Planetary Science Letters, entitled "Mechanisms for generating elevated zircon δ18O in Archean crust: Insights from the Saglek-Hebron Complex, Canada".
In this study, they present 271 zircon in-situ SIMS oxygen isotope analyses for granitoids (3.87 to 2.79 billion years old), from the Saglek-Hebron Complex located in northern Labrador, Canada. Crustal rocks of this age are rare and offer valuable opportunities to interrogate how the earliest continent-forming processes may have differed from the modern plate-tectonic regime. The zircon δ18O values range from 5.0 to 8.4 ‰ and include some of the highest igneous Archean zircon oxygen isotope ratios recorded to date. They propose that elevated zircon δ18O values may reflect incorporation of altered sediments during localized anatectic melting, preceding a broader global shift in subducted sediment composition and volume at the Archean-Proterozoic boundary.
Link to the publication: https://authors.elsevier.com/c/1i5jR,Ig4V7gP