Non-destructive analysis and lithological descriptions of sediment cores from Lake Nurume (JARE61)

Antarctica's lake sediments are valuable geological archives for paleoenvironmental reconstructions as sea-level and ice-sheet change. It is important to proceed with an analysis of cores from several locations in one lake to reconstruct detailed environmental changes. In the geomorphological survey of the 61st Japanese Antarctic Research Expedition, we collected four sediment cores in Lake Nurume, located at Langhovde in Lutzow-Holm Bay, East Antarctica. We present preliminary results of non-destructive analysis of these cores, such as X-ray CT scanning, physical properties, and visual core descriptions.南极湖泊沉积物是用于开展海平面与冰盖变化相关古环境重建的珍贵地质档案。若要还原精细的环境变化过程，对单个湖泊内多个采样点位的岩芯开展分析至关重要。在第61次日本南极科考队的地貌调查期间，我们于东南极洲吕佐夫-霍尔姆湾朗霍夫德湾的努尔梅湖（Lake Nurume）采集了4个沉积物岩芯。本文报道了这批岩芯的无损分析初步结果，涵盖X射线计算机断层扫描（X-ray CT）、物理特性检测以及岩芯目视描述。