Grainsize composition of composite sediment core ROD11 from the crater basin of Rodderberg, Germany@en

Grainsize data supports palaeoclimatic reconstruction of glacial/interglacial cycles for the Middle Pleistocene sediment record from the crater basin of Rodderberg, Germany. A sediment record measuring 72.8 m in length was retrieved by employing wire-line drilling techniques, utilising 3 m-long liners, from the silted-up crater basin of Rodderberg (East Eifel Volcanic Field) in the vicinity of the city of Bonn, Germany. For the purpose of grainsize analysis, the composite record ROD11 was systematically subsampled at a spatial resolution of 2 cm and examined through a laser diffraction particle size analyser (Beckman Coulter LS 13320). The resulting sedimentological data characterise glacials as silt-dominated (aeolian sediments: loess), interglacials as sand-dominated (runoff-related deposits from the step crater walls) and clay dominance for the Holocene soil. The terrestrial sediment record has been evaluated through multiple dating techniques and it provides a comprehensive environmental reconstruction since the Middle Pleistocene, thus providing valuable insights into the region's climate history.粒度数据可为德国罗德贝格（Rodderberg）火山口盆地中更新世（Middle Pleistocene）沉积记录的冰期/间冰期旋回古气候重建提供支撑。研究团队采用绳索取芯钻井技术（wire-line drilling），搭配3米长岩心管，从位于德国波恩附近的淤积型罗德贝格火山口盆地（东埃菲尔火山场（East Eifel Volcanic Field））中获取了总长72.8米的沉积岩心记录。为开展粒度分析，研究人员对复合沉积岩心记录ROD11以2厘米的空间分辨率进行系统分样，并使用激光衍射粒度分析仪（Beckman Coulter LS 13320）完成检测。所得沉积学数据显示：冰期沉积以粉砂为主（风成沉积物：黄土（loess）），间冰期沉积以砂质为主（来自阶梯状火山口壁的径流相关沉积物），全新世（Holocene）土壤则以黏土占优。该陆相沉积记录已通过多种测年技术完成定年验证，完整重建了中更新世以来的区域环境演化历史，可为深入理解该地区的气候变迁历史提供宝贵的科学参考。