X-ray fluorescence (XRF) scans of sediment cores collected from the Semenov Hydrothermal Field region of the Mid-Atlantic Ridge during the RRS James Cook cruises JC224 (March - April 2022) and JC254 (October - November 2023)

X-ray fluorescence (XRF) analyses of split archive halves of sediment cores collected from the Semenov Hydrothermal Field region of the Mid-Atlantic Ridge during the RRS James Cook cruises JC224 (March - April 2022) and JC254 (October - November 2023) were conducted using the COX Analytical Systems Itrax Core Scanner at the British Ocean Sediment Core Research Facility (BOSCORF). This system determines the elemental composition of sediment cores through non-destructive micro-XRF techniques, enabling first-order geochemical characterisation and detailed downcore variations at millimeter-scale resolution. This dataset forms part of a PhD project funded under NERC's Ultramafic-hosted mineral Resource Assessment (ULTRA) project, grant reference NE/S004068/1, and the sediment cores are currently stored at the BOSCORF for long-term preservation.