Calcium and Trace Elemental Ratios of Late Triassic-Early Jurassic Carbonate Platforms (Mount Sparagio)

Calcium isotope ratios (δ44Ca) and minor/trace elemental ratios (Mn, Sr, U, V, Cr, Fe /(Ca + Mg)) were measured from bulk carbonate powders in 2023 on samples collected in 2006 from an outcropping near Val Adrara, Lombardy Basin in the Italian Alps region using MC-ICP-MS at University of Chicago. Samples were collected with rock hammers and chemical measurements were performed on samples at an average resolution of 15 m. These deposits represent a shallow carbonate platform active during the Late Triassic (Rhaetian stage, ~199.7 Ma) to Early Jurassic (Hettangian stage, ~196.5 Ma)(van der Schootbrugge, 2008,doi:10.1029/2007GC001914). Carbon (δ13C), oxygen (δ18O), calcium (δ44Ca) isotope and minor/trace elemental ratios (Mn, Sr, U, V, Cr, Fe /(Ca + Mg)) were also measured in 2023 from samples collected from an outcrop near Mount Sparagio, Sicily in 2022. Carbon and oxygen isotope ratios were measured on a Finnigan MAT 253 mass spectrometer. Chemical analyses were performed at a resolution of approximately 5 m. These deposits represent a transitional to evaporitic setting during the Late Triassic (Rhaetian stage, exact dates uncertain) to Early Jurassic (Hettangian stage) (Todaro et al., 2022; doi:10.3389/feart.2022.875466). These analyses were performed to investigate potential differences in diagenetic alteration at the two sites, Val Adrara and Mount Sparagio, across the Triassic-Jurassic transition. The data is associated with the publication Prow-Fleischer et al., (2025), doi:10.1016/j.chemgeo.2024.122530.

2023年，研究人员对2006年采自意大利阿尔卑斯地区伦巴第盆地瓦尔德拉腊（Val Adrara）附近露头的块状碳酸盐岩粉末样品，采用芝加哥大学的多接收电感耦合等离子体质谱仪（MC-ICP-MS）测定了钙同位素比值（δ⁴⁴Ca）以及微量/痕量元素比值（Mn、Sr、U、V、Cr、Fe/(Ca+Mg)）。样品采集使用岩锤完成，化学测试的平均采样分辨率为15米。该套沉积地层代表了晚三叠世（瑞替阶，约199.7 Ma）至早侏罗世（赫塘阶，约196.5 Ma）活动的浅海碳酸盐岩台地（van der Schootbrugge, 2008, doi:10.1029/2007GC001914）。

2023年，研究人员还对2022年采自意大利西西里岛斯帕拉焦山（Mount Sparagio）附近露头的样品，测定了碳同位素比值（δ¹³C）、氧同位素比值（δ¹⁸O）、钙同位素比值（δ⁴⁴Ca）以及微量/痕量元素比值（Mn、Sr、U、V、Cr、Fe/(Ca+Mg)）。其中碳、氧同位素比值采用Finnigan MAT 253质谱仪完成测定，化学分析的采样分辨率约为5米。该套沉积地层代表了晚三叠世（瑞替阶，精确年代尚未明确）至早侏罗世（赫塘阶）的过渡-蒸发岩沉积环境（Todaro et al., 2022; doi:10.3389/feart.2022.875466）。

本数据集的分析工作旨在探究三叠纪-侏罗纪过渡界面前后，瓦尔德拉腊与斯帕拉焦山两处沉积位点的成岩蚀变潜在差异。本数据集关联于研究论文Prow-Fleischer et al.（2025），doi:10.1016/j.chemgeo.2024.122530。