Photographs 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)

High-resolution images of split 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 obtained at the British Ocean Sediment Core Research Facility (BOSCORF) using a Geotek Core Imaging System (MSCL-CIS), equipped with a dedicated track for the Geoscan V linescan camera. Soon after splitting, to avoid capturing colour changes caused by e.g. oxidation, the half-round core samples are mounted on the track and the camera and LED lighting system automatically move over the sample to capture the image. The images show the lithology of sediment cores from 24 stations across the hydrothermally active region, which can be used as a reliable digital archive in publications. The data were collected as 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.

本数据集包含2022年3—4月（RRS James Cook航次JC224）与2023年10—11月（RRS James Cook航次JC254）期间，在中大西洋海脊（Mid-Atlantic Ridge）谢苗诺夫热液田（Semenov Hydrothermal Field）采集的剖开沉积物岩芯的高分辨率图像。该图像由英国海洋沉积物岩芯研究设施（British Ocean Sediment Core Research Facility, BOSCORF）使用搭载Geoscan V线扫描相机专用轨道的Geotek岩芯成像系统（MSCL-CIS）完成采集。为避免捕捉到氧化等因素引发的颜色变化，岩芯对半剖开后会立即被安装至轨道上，随后相机与LED照明系统将沿样品自动移动以完成图像采集。该批图像展示了热液活动区内24个站位的沉积物岩芯岩性特征，可作为可靠的数字档案用于学术出版物。本数据集采集自英国自然环境研究委员会（NERC）资助的超镁铁质岩寄主矿产资源评估（Ultramafic-hosted mineral Resource Assessment, ULTRA）项目下属的博士研究课题，项目资助编号为NE/S004068/1。目前所有沉积物岩芯均存放于BOSCORF进行长期保存。