Magnetic susceptibility of composite sediment core ROD11 from the crater basin of Rodderberg, Germany

Magnetic susceptibility – a proxy parameter for core correlation and reconstruction of glacial/interglacial cycles for the Middle Pleistocene sediment record from the crater basin of Rodderberg, Germany. A 72.8 m long sediment record was recovered by means of wire-line drilling with 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. The two drill holes (ROD11-2 and ROD11-3) were merged to establish a composite record (ROD11) based on macroscopic sediment description and were fine-tuned by magnetic susceptibility data. Magnetic susceptibility was continuously logged with 1 cm spatial resolution with a Bartington loop-sensor (MS2C) on a GEOTEK multi-sensor core-logger. Furthermore, this parameter facilitates the differentiation between glacial and interglacial sediments, thereby supporting the palaeoclimatic interpretation based on geochemical data spanning the past 430 ka. The combined evidence suggests a depositional evolution from a deep crater lake via a shallow lake or desiccating wetland followed by deposition of loess and pedogenesis. This terrestrial record, evaluated through multiple dating techniques, offers a comprehensive environmental reconstruction since the Middle Pleistocene.

磁化率（Magnetic Susceptibility）——德国罗德贝格火山口盆地中更新世沉积记录的岩芯对比与冰期/间冰期旋回重建代用参数。研究团队采用绳索取芯钻探（wire-line drilling），使用3米长岩芯管，从德国波恩附近的淤积型东埃菲尔火山岩区（East Eifel Volcanic Field）罗德贝格火山口盆地获取了总长72.8米的沉积记录。基于两口钻井（ROD11-2与ROD11-3）的宏观沉积描述，将其合并构建复合记录ROD11，并通过磁化率数据进行微调。采用Bartington环型传感器（MS2C）搭配GEOTEK多传感器岩芯扫描记录仪（GEOTEK multi-sensor core-logger），以1厘米的空间分辨率对磁化率进行连续测井。此外，该参数可有效区分冰期与间冰期沉积，辅助基于过去43万年地球化学数据的古气候解译。综合证据表明，沉积演化经历了从深水火山口湖到浅水湖泊或干涸湿地的过程，随后沉积了黄土并伴随土壤发育。该陆相记录通过多种测年技术进行评估，为中更新世以来的环境重建提供了全面的数据支撑。