Mg/Ca and Sr/Ca ratios of Echinoderm ossicles and plants from Late Pennsylvanian Coal Balls of the Midland (Dalton coal) and Illinois basins (Calhoun Coal), North America

Data Sheet 1. Dalton and Calhoun high-magnesium calcite (HMC) results. Magnesium and calcium contents for echinoderms and coal ball calcite. Seawater Mg/Ca_SW mol/mol calculated using partition coefficient <em>D</em>_<em>C</em>Mg = 0.03757 (Dickson, 2004) and power partition functions Mg/Ca_C = 0.0516Mg/Ca_SW0.668, Mg/Ca_C = 0.0482Mg/Ca_SW0.898 (Ries, 2004). Sr/Ca and Na/Ca ratios reported in mmol/mol. Data Sheet 2. Dalton and Calhoun low-magnesium calcite (LMC) results. Mg and Ca contents for echinoderms and coal ball calcite. Sr/Ca and Na/Ca ratios reported in mmol/mol. Chemical characterization of carbonates by wave-length dispersive (WDS) analyses with a Cameca SX-5, housed in the Texas A&amp;M Materials Characterization Facility (RRID:SCR_022202). Calcium, Magnesium, Strontium, Iron, Sodium, Manganese, Sulfur, Silicon and Aluminum contents of echinoderm ossicles and plant cements analysed.

数据表1. Dalton与Calhoun高镁方解石（high-magnesium calcite, HMC）分析结果。包含棘皮动物及煤球方解石的镁、钙元素含量。海水Mg/Ca_SW摩尔比通过分配系数<em>D</em>_<em>C</em>Mg = 0.03757（Dickson, 2004）计算得到，同时采用以下幂函数分配关系：Mg/Ca_C = 0.0516×Mg/Ca_SW^0.668、Mg/Ca_C = 0.0482×Mg/Ca_SW^0.898（Ries, 2004）。Sr/Ca与Na/Ca比值以mmol/mol为单位进行报告。
数据表2. Dalton与Calhoun低镁方解石（low-magnesium calcite, LMC）分析结果。包含棘皮动物及煤球方解石的镁、钙元素含量，Sr/Ca与Na/Ca比值以mmol/mol为单位进行报告。
采用搭载于德克萨斯农工大学材料表征设施（Texas A&M Materials Characterization Facility, RRID:SCR_022202）的Cameca SX-5型设备，通过波长色散谱（wave-length dispersive, WDS）分析完成碳酸盐的化学表征。本次分析测定了棘皮动物骨片与植物胶结物中的钙、镁、锶、铁、钠、锰、硫、硅及铝元素含量。