Supplementary materials for Chemical characterization of Nannoconus based on synchrotron micro X-ray fluorescence

Nannoconus, a major planktonic carbonate producer in the Early Cretaceous (~150–120 Ma), formed the largeest (size ~5-20 μm) and heaviest (mass ~200-1400 picogram) calcite skeletons, contributing to massive marine carbonate accumulations for ~30 million years, but its calcification site remains unknown. Magnesium (Mg) is a useful indicator of calcification site, as typically extracellular calcite contains more Mg than intracellular calcite. To assess Mg and other elemental content in Nannoconus, a chemical analysis was performed utilizing micro X-ray fluorescence (μ-XRF) at the ID21 beamline of the European Synchrotron Radiation Facility (ESRF). The results of this experiment are planned to be submitted as a publication in the journal of PCI Paleontology with the title of: Chemical characterization of Nannoconus based on synchrotron micro X-ray fluorescence. This dataset contains the supplementary images, tables and python-based code documented in the manuscript.纳米锥石（Nannoconus）是早白垩世（约1.5亿至1.2亿年）的主要浮游碳酸盐生产者，其形成的方解石骨骼尺寸最大可达5~20微米、质量可达200~1400皮克，是已知体型最大、质量最重的钙质骨骼生物之一，持续约3000万年参与大规模海洋碳酸盐沉积，但其钙化位点至今仍未明确。 镁（Magnesium, Mg）是探究钙化位点的有效指示因子，因为通常胞外方解石的镁含量高于胞内方解石。为测定纳米锥石中的镁及其他元素含量，研究团队依托欧洲同步辐射装置（European Synchrotron Radiation Facility, ESRF）的ID21光束线，采用微X射线荧光（micro X-ray fluorescence, μ-XRF）技术开展了化学分析实验。 本实验的研究成果拟以《基于同步辐射微X射线荧光的纳米锥石化学特征表征》为题投稿至《PCI古生物学》期刊。本数据集包含该论文手稿中附带的补充图像、表格及基于Python编写的分析代码。