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/CaSW mol/mol calculated using partition coefficient DCMg = 0.03757 (Dickson, 2004) and power partition functions Mg/CaC = 0.0516Mg/CaSW0.668, Mg/CaC = 0.0482Mg/CaSW0.898 (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&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：道尔顿与卡尔霍恩高镁方解石（high-magnesium calcite, HMC）测试结果。包含棘皮动物与煤核方解石的镁、钙含量。海水Mg/Ca摩尔比（Mg/CaSW）通过分配系数DCMg=0.03757（Dickson, 2004）以及幂律分配函数Mg/CaC=0.0516×Mg/CaSW^0.668、Mg/CaC=0.0482×Mg/CaSW^0.898（Ries, 2004）计算得到。文中Sr/Ca与Na/Ca比值以毫摩尔每摩尔（mmol/mol）为单位报告。 数据表2：道尔顿与卡尔霍恩低镁方解石（low-magnesium calcite, LMC）测试结果。包含棘皮动物与煤核方解石的镁、钙含量。文中Sr/Ca与Na/Ca比值以毫摩尔每摩尔（mmol/mol）为单位报告。 本研究采用搭载于德克萨斯农工大学材料表征中心（RRID:SCR_022202）的卡麦克SX-5（Cameca SX-5）仪器，通过波长色散（wave-length dispersive, WDS）分析法对碳酸盐样品开展化学表征，分析了棘皮动物骨板与植物胶结物中的钙、镁、锶、铁、钠、锰、硫、硅及铝元素含量。