Replication data for: Slackwater flood sediment analyses from Lake Ástjörn on northern Iceland

This dataset includes all sediment analyses performed on core AST-P2-18 from lake Ástjörn on northern Iceland and include all data presented by van der Bilt et al. 2021 (Communications Earth & Environment: accepted, but at the time of uploading only available as a pre-print: 10.21203/rs.3.rs-83734/v1). Core AST-P1-18 (described in the manuscript) was not analyzed as it covered a shorter sequence. The investigated record has been extracted during the summer of 2018 with a piston coring device, analyzed throughout 2019 and covers the past 4.5 ka BP. Core AST-P2-18 was taken to investigate the timing and magnitude of glacio-volcanic megafloods from the Jökulsá á Fjöllum: lake Ástjörn sits above this river and therefore receives slackwater sedimentation when floodwaters spill into the basin. The data are organized per paper figure per .txt file: Fig. 5 includes EPMA (microprobe) data of analyzed glass shards used for tephrochronology, Fig. 6 includes all stratigraphic data generated on an ITRAX XRF core scanner/ProCon CT-ALPHA CT scanner/Mastersizer 3000 particle size analyzer as well as density and loss-on-ignition (LOI) measurements, while Fig. 7 includes grain size endmember modelling output. Additional details may be found in the appended readme file.

本数据集囊括了在冰岛北部Ástjörn湖的AST-P2-18岩芯上进行的所有沉积物分析，并包含了van der Bilt等人于2021年（通讯地球与环境：已接受，但上传时仅作为预印本提供：10.21203/rs.3.rs-83734/v1）所展示的所有数据。未对描述于手稿中的AST-P1-18岩芯进行分析，因其覆盖的序列较短。所研究的记录是在2018年夏季使用活塞取芯装置提取的，于2019年全年进行分析，并覆盖了距今4.5千年的过去。AST-P2-18岩芯的采集旨在研究Jökulsá á Fjöllum河冰川火山巨洪的时序和规模：Ástjörn湖位于该河之上，因此当洪水涌入盆地时，会接收松弛水沉积物。数据按照论文中的图示分别组织在各自的.txt文件中：图5包含了用于火山灰年代学的分析玻璃碎片的EPMA（微探针）数据，图6包含了在ITRAX XRF岩芯扫描仪/ProCon CT-ALPHA CT扫描仪/Mastersizer 3000粒度分析仪上生成的所有地层学数据，以及密度和灼烧失重（LOI）测量，而图7包含了粒度端元建模输出。更多详细信息可参考附带的readme文件。