Dr Ashley Martin

I am an Isotope Geochemist primarily interested in how Earth became and has remained (mostly) habitatable for the past 3.5 billion years. I primarily use uranium and vanadium isotopes as novel proxies for tracing past changes in marine oxygenation levels and nitrogen isotopes to understand past changes in biological productivity.

• Please visit the Pure Research Information Portal for further information
• Anomalous δ15N values in the Neoarchean associated with an abundant supply of hydrothermal ammonium, Martin, A., Stüeken, E., Gehringer, M., Markowska, M., Vonhof, H., Weyer, S., Hofmann, A. 22 Feb 2025, In: Nature Communications
• Mechanisms of nitrogen isotope fractionation at an ancient black smoker in the 2.7 Ga Abitibi greenstone belt, Canada, Martin, A., Stüeken, E., Michaud, J., Münker, C., Weyer, S., van Hees, E., Gehringer, M. 1 Mar 2024, In: Geology
• Assessing the reliability of modern marine stromatolites as archives for the uranium isotope paleoredox proxy, Martin, A., Markowska, M., Chivas, A., Weyer, S. 15 Mar 2023, In: Geochimica et Cosmochimica Acta
• Late Quaternary variability in sediment residence time and provenance in the Gulf of Carpentaria, northern Australia, Dosseto, A., Martin, A., May, J., Kinsley, L., Karatchevtseva, I., Chivas, A. 15 Oct 2025, In: Quaternary Science Reviews
• Sediment residence times in catchments draining to the Gulf of Carpentaria, northern Australia, inferred by uranium comminution dating, Martin, A., Dosseto, A., May, J., Jansen, J., Kinsley, L., Chivas, A. 1 Jan 2019, In: Geochimica et Cosmochimica Acta

Nel Jones Hydrothermal and redox controls on ancient ocean chemistry and sedimentary ore genesis: insights from vanadium isotope geochemistry Start Date: 10/10/2025

• PhD July 19 2017
• Chemistry July 01 2011