Lithology and compositions of the Onnuri oceanic core complex, Central Indian Ridge

This dataset provides a comprehensive suite of petrological and geochemical data used to characterize the subseafloor architecture and lithological variations of the Onnuri oceanic core complex (OCC) at 11°25’S on the Central Indian Ridge. The data is derived from rock samples recovered from the detachment fault surface and its extensively exposed 1-km vertical slopes (the NE and SE slopes) through targeted dredge hauls and Remotely Operated Vehicle (ROV) dives. These datasets offer fundamental geological constraints on the crustal composition, magmatic evolution, and strain partitioning mechanisms beneath a high-temperature ultramafic-hosted hydrothermal system.本数据集提供一套完整的岩石学与地球化学数据，用于表征中央印度洋海岭南纬11°25′处的Onnuri海洋核杂岩（Oceanic Core Complex, OCC）的海底深部构造与岩性变化。该数据源自通过定向拖网采样与遥控作业潜水器（Remotely Operated Vehicle, ROV）下潜，从拆离断层面及其广泛出露的1千米垂直斜坡（东北坡与东南坡）采集的岩石样品。本数据集可为高温超镁铁质岩赋存的热液系统下方的地壳组成、岩浆演化以及应变分配机制提供关键的地质约束依据。