Abstract The bulk elemental concentration of selected Albert Formation oil shale deposits of Mississippian age from New Brunswick was analyzed using ICP-MS and Prompt Gamma. Results compared to that of the Big Marsh oil shale of similar age from Nova Scotia. Reflected white and fluorescence light was used to determine the characteristic organic matter, and RockEval analyses were used to determine the hydrocarbon potential of oil shale. Both Albert and Big Marsh oil shales were deposited in lacustrine environments, based on geological and sedimentological evidence. The Big Marsh oil shale has low and stable B content (28-54 ppm), which stays almost constant and with the range for freshwater with depth. By contrast, the oil shales from the Albert Formation from New Brunswick have high and were for Albert oil shale. The Big Marsh deposit, in contrast, had stable discharge and recharge with higher aluminosilicate input and limited or no carbonate content. The rate of sedimentation, as determined by Na/K and Th/K ratios indicates that the Albert oil shales deposited at a slower rate as compared to the Big Marsh oil shales. The lower Th/U ratio for Albert oil shale as compared to the Big Marsh is likely due to lower input of weathered and recycled sedimentary terrestrial flux, and allochthonous U content, into the lacustrine setting during their deposition. Albert oil shales deposited in oxic-dysoxic conditions based on their Cr and V/Cr ratio, suggesting a well-oxygenated and uniform, warm temperature upper water level. Variation of Ca/Sr versus Ca/Mn ratios for the Albert oil shale, indicates low Mn/Ca and relatively high Sr/Ca ratio for most of the samples, due to low terrigenous influx and warmer water, which is supported by the mineralogy of the oil shales, which contain low quartz and clay minerals. The presence of higher authigenic U and Mn/Ca ratio for Albert oil shale indicates low terrestrial flux and, therefore Th as compared to Big Marsh oil shales. The Rare Earth element (REEs) content is higher for the Big Marsh oil shales owning to a higher input of aluminosilicate than the Albert oil shale as supported by variation of Y and La and that of Hydrogen index (HI) and Heavy Rare earth (HREEs). The Albert oil shale displays a positive Eu anomaly, typical of a high carbonate environment. By contrast, Big Marsh, which shows a negative Eu anomaly, which is typical of upper continental crust.

中文翻译：

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加拿大新斯科舍省和新不伦瑞克省密西西比纪湖相油页岩地球化学比较

摘要 使用 ICP-MS 和 Prompt Gamma 分析了来自新不伦瑞克的密西西比时代选定的 Albert 组油页岩矿床的整体元素浓度。结果与来自新斯科舍省的类似年龄的 Big Marsh 油页岩的结果相比。反射白光和荧光灯用于确定特征有机质，RockEval分析用于确定油页岩的油气潜力。根据地质和沉积学证据，Albert 和 Big Marsh 油页岩都沉积在湖泊环境中。Big Marsh 油页岩的 B 含量低且稳定（28-54 ppm），几乎保持不变，并且随着深度的变化而在淡水范围内。相比之下，来自新不伦瑞克省 Albert 组的油页岩含量较高，且属于 Albert 油页岩。相比之下，大沼泽矿床 具有稳定的放电和充电，具有较高的铝硅酸盐输入和有限的碳酸盐含量或无碳酸盐含量。由 Na/K 和 Th/K 比率确定的沉积速率表明，与 Big Marsh 油页岩相比，Albert 油页岩的沉积速率较慢。与大沼泽相比，阿尔伯特油页岩的 Th/U 比率较低，这可能是由于风化和再循环的沉积陆地通量以及外来 U 含量在沉积过程中输入湖相环境中较低。根据其 Cr 和 V/Cr 比值，Albert 油页岩在含氧-缺氧条件下沉积，表明上水位含氧良好且温度均匀，温度较高。阿尔伯特油页岩的 Ca/Sr 与 Ca/Mn 比率的变化表明大多数样品的 Mn/Ca 和相对较高的 Sr/Ca 比率，由于低陆源流入量和温暖的水，这是由油页岩的矿物学支持的，其中包含低石英和粘土矿物。Albert 油页岩存在较高的自生 U 和 Mn/Ca 比表明与 Big Marsh 油页岩相比，陆地通量较低，因此 Th 较低。由于 Y 和 La 的变化以及氢指数 (HI) 和重稀土 (HREE) 的变化所支持，Big Marsh 油页岩的稀土元素 (REE) 含量高于 Albert 油页岩，因为它的铝硅酸盐输入量高于 Albert 油页岩）。Albert 油页岩显示出 Eu 正异常，这是典型的高碳酸盐环境。相比之下，大沼泽则显示出负的 Eu 异常，这是上大陆地壳的典型特征。其中含有低石英和粘土矿物。Albert 油页岩存在较高的自生 U 和 Mn/Ca 比表明与 Big Marsh 油页岩相比，陆地通量较低，因此 Th 较低。由于 Y 和 La 的变化以及氢指数 (HI) 和重稀土 (HREE) 的变化所支持，Big Marsh 油页岩的稀土元素 (REE) 含量高于 Albert 油页岩，因为它的铝硅酸盐输入量高于 Albert 油页岩）。Albert 油页岩显示出 Eu 正异常，这是典型的高碳酸盐环境。相比之下，大沼泽则显示出负的 Eu 异常，这是上大陆地壳的典型特征。其中含有低石英和粘土矿物。Albert 油页岩存在较高的自生 U 和 Mn/Ca 比表明与 Big Marsh 油页岩相比，陆地通量较低，因此 Th 较低。由于 Y 和 La 的变化以及氢指数 (HI) 和重稀土 (HREE) 的变化所支持，Big Marsh 油页岩的稀土元素 (REE) 含量高于 Albert 油页岩，因为它的铝硅酸盐输入量高于 Albert 油页岩）。Albert 油页岩显示出 Eu 正异常，这是典型的高碳酸盐环境。相比之下，大沼泽则显示出负的 Eu 异常，这是上大陆地壳的典型特征。由于 Y 和 La 的变化以及氢指数 (HI) 和重稀土 (HREE) 的变化所支持，Big Marsh 油页岩的稀土元素 (REE) 含量高于 Albert 油页岩，因为它的铝硅酸盐输入量高于 Albert 油页岩）。Albert 油页岩显示出 Eu 正异常，这是典型的高碳酸盐环境。相比之下，大沼泽则显示出负的 Eu 异常，这是上大陆地壳的典型特征。由于 Y 和 La 的变化以及氢指数 (HI) 和重稀土 (HREE) 的变化所支持，Big Marsh 油页岩的稀土元素 (REE) 含量高于 Albert 油页岩，因为它的铝硅酸盐输入量高于 Albert 油页岩）。Albert 油页岩显示出 Eu 正异常，这是典型的高碳酸盐环境。相比之下，大沼泽则显示出负的 Eu 异常，这是上大陆地壳的典型特征。