(Table XIV-1, Page 137-139) Physical characteristics of manganese nodules collected in the Pacific Ocean during cruise GH76-1 of R/V Hakurei Maru

Nodule samples obtained were described and studied on board for 1) observation of occurrence and morphology in and outside samplers, size classification, measurement of weight and calculation of population density (kg/m2); 2) photographing whole nodules on the plate marked with the frames of unit areas of both 0cean-70 (0.50 m2) and freefall grab (0.13 m2), and that of typical samples on the plate with a 5 cm grid scale: 3) observation of internal structures of the nodules on cut section; and 4) determination of mineral composition by X-ray diffractometer. The relation between nodule types and geological environment or chemical composition was examined by referring to other data of related studies, such as sedimentology. acoustic survey, and chemical analysis.

本次研究对获取的结核样品开展了船基系统描述与分析工作，具体内容如下：1）观测采样器内部及外部结核的产出状态与形貌特征、开展粒度分级、测定样品重量并计算种群密度（单位：kg/m²）；2）在标注有Ocean-70（0.50 m²）与自由下落式采泥器（freefall grab，0.13 m²）单位面积采样框架的载样平板上拍摄全部结核的全貌，并在带有5 cm网格比例尺的平板上拍摄典型样品的影像；3）对切割制备的切片上的结核内部结构进行观测；4）采用X射线衍射仪（X-ray diffractometer）测定结核的矿物组成。此外，本研究还参考沉积学、声学探测、化学分析等相关研究数据，探究了结核类型与地质环境、化学成分之间的关联。