Anatomy of an intruded coal, I: Effect of contact metamorphism on whole-coal geochemistry, Springfield (No. 5) (Pennsylvanian) coal, Illinois Basin
Anatomy of an intruded coal, I: Effect of contact metamorphism on whole-coal geochemistry, Springfield (No. 5) (Pennsylvanian) coal, Illinois Basin
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DOI：
10.1016/j.coal.2009.06.002
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发表时间：
2009-08-01
影响因子：
5.6
通讯作者：
Hower, James C.
中科院分区：
文献类型：
--
作者：
Rimmer, Susan M.;Yoksoulian, Lois E.;Hower, James C.
如果时间和加热速率是煤成熟的重要因素，人们可能会期望看到化学变化的差异，以响应成熟取决于增加的等级的手段。使用一套从伊利诺斯州南部侵入的宾夕法尼亚时代煤中获得的样品。我们提供全煤化学数据。将这些数据与经历了正常埋藏成熟的煤的现存地球化学数据进行比较，我们评估了如果煤蚀变发生迅速的假设，（由于侵入）而不是逐渐地（埋藏成熟），那么不同的化学成分（工业分析和元素分析）和镜质体反射率。阿斯图里亚斯[威斯特伐利亚D]斯普林菲尔德（5号）煤矿开采于伊利诺斯州南部埃尔多拉多附近的大岭煤矿。这种高挥发分的B烟煤是在早二叠世被超镁铁质岩浆侵入体侵入的。蚀变的发生类似于1.2倍岩墙厚度，包括随机镜质组反射率（R（m））从0.7%增加到5.3%以上，失去了脂质体，并形成脱挥发泡和细镶嵌结构。挥发性物质（VM）的减少和固定碳（FC）的增加似乎低于蚀变晕内反射率水平的预期。碳酸盐矿物有一个主要的影响，但即使在去除碳酸盐，VM的减少仍然小于会看到在煤中的类似镜质组反射率，改变了正常的埋藏成熟。碳酸盐矿化也有助于接近侵入体的元素分析值的变化，特别是%C和%O。碳酸盐去除后，这些煤的数据似乎不遵循正常的埋藏煤化轨迹时，绘制在货车Krevelen图和Seyler图表。这些差异表明，一个略有不同的成熟途径可能已经遵循了这些煤和其他被侵入迅速改变。(C)2009爱思唯尔有限公司版权所有。
If time and heating rate are important agents in coal maturation, one might expect to see differences in chemical changes in response to maturation depending on the means of increased rank. Using a suite of samples obtained from an intruded Pennsylvanian-age coal in southern Illinois. we present whole-coal chemical data. Comparing these data to extant geochemical data for coals that have undergone normal burial maturation, we evaluated the hypothesis that if coal alteration occurs rapidly (due to intrusion) rather than gradually (burial maturation), then different relationships are seen in chemical composition (proximate and ultimate analyses) and vitrinite reflectance.The Pennsylvanian-age (Asturian [Westphalian D]) Springfield (No. 5) coal is mined at the Big Ridge Mine, near Eldorado, southern Illinois. This high volatile B bituminous coal was intruded by an ultramafic igneous intrusion during the early Permian. Alteration occurs out to similar to 1.2x dike thickness and includes an increase in random vitrinite reflectance (R(m)) from levels similar to 0.7% to over 5.3%, loss of liptinites, and formation of devolatilization vacuoles and fine mosaic texture. Decreases in volatile matter (VM) and increases in fixed carbon (FC) appear to be less than would be expected for the level of reflectance seen within the alteration halo. Carbonate minerals have a major influence on proximate analyses but even following the removal of carbonates, the decrease in VM is still less than would be seen in coals of similar vitrinite reflectance that were altered by normal burial maturation. Carbonate mineralization also contributes to variability in ultimate analysis values approaching the intrusion, particularly for %C and %O. After carbonate removal, data for these coals do not appear to follow the normal burial coalification tracks when plotted on a van Krevelen diagram and on a Seyler chart. These differences suggest that a slightly different maturation pathway may have been followed by these coals and by others that were altered rapidly by intrusion. (C) 2009 Elsevier B.V. All rights reserved.