Phys.org  June 17, 2024 Anoxic events are prolonged periods where large expanses of the Earth’s oceans are depleted of dissolved oxygen, which creates toxic waters and leads to mass extinction and habitat loss. The cause of this anoxic event which lasted >500,000 years has been a source of debate among experts. Researchers in the UK used basin sedimentary mercury (Hg) concentrations to determine the timing of volcanism, and neodymium (Nd) and strontium (Sr) isotopes for sedimentary provenance. High Hg concentrations compared to Northern Hemisphere records, and a shift to radiogenic Nd isotopes, indicated Kerguelen LIP volcanic activity and plateau uplift […]