Anaïs Fourny

PhD student
University of British Columbia

After a B.Sc. in Earth Sciences at the Université de Nantes (France), I completed a Master’s degree at Université Joseph Fourier in Grenoble (France) in 2011. My M.Sc. thesis examined the geochemistry and isotopic composition of the oceanic crust of the Shikoku Basin, south of Japan. Since January 2012, I am a PhD student under the supervision of Drs. Weis and Scoates at the University of British Columbia in Vancouver. My research focuses on the isotopic composition of layered intrusions.

Large layered intrusions are natural laboratories for studying differentiation and crystallization within Earth’s crust. Minerals coexisting in cumulates within a single mafic layered intrusion have long been considered to have crystallized from the same magma and thus should share the same radiogenic isotopic compositions. Yet, significant radiogenic isotopic heterogeneities are increasingly documented between coexisting minerals. These differences are not related to secondary alteration, thus either the minerals crystallized from magmas of different isotopic compositions or concomitant magmatic processes disturbed their primary isotopic signatures. To investigate the extent and causes of this isotopic variability, I am analyzing lead, strontium, hafnium, and neodymium isotopic compositions of coexisting minerals in the ca. 1307 Ma Kiglapait intrusion, Labrador (Canada).