Implications of paleobotany of Pennsylvanian-age coal of the central Appalachian basin for climate and coal-bed development
Implications of paleobotany of Pennsylvanian-age coal of the central Appalachian basin for climate and coal-bed development
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阿巴拉契亚盆地中部宾夕法尼亚时代煤炭的古植物学对气候和煤层开发的影响
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发表时间：
1990
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通讯作者：
R. Winston
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作者：
R. Winston
煤中石松足类丰度被用来估计阿巴拉契亚盆地中部宾夕法尼亚期的气候“湿度”。植物被确定从他们的解剖学使用蚀刻，抛光煤，而不是使用permineralized泥炭，压缩/印象，或孢粉。数据表明，两个干燥的间隔发生：一个在威斯特伐利亚B（中间的卡纳瓦组），另一个在早期Stephanian（Conemaugh组）。这两个干燥的间隔已被确认在伊利诺伊州盆地，但只有第二个已被确认在阿巴拉契亚盆地在9个18个地点，石松类丰度下降向上煤层内，而在其他9个地方，没有统计学上的显著趋势石松类丰度观察。石足类丰度的向上减少暗示了在圆顶状泥炭沼泽的中心区域形成的煤，但没有证明泥炭圆顶的形成。在煤层中，蕨类植物在分裂或含有丰富矿物质的样品中最丰富。
Lycopod abundance in coal is used to estimate climatic "wetness" during the Pennsylvanian period in the central Appalachian basin. Plants were identified from their anatomy using etched, polished coal rather than using permineralized peat, compressions/impressions, or palynology. The data indicate that two drier intervals occurred: one in the Westphalian B (middle of the Kanawha Formation), the other in the early Stephanian (Conemaugh Formation). Both drier intervals have been previously recognized in the Illinois basin, but only the second has been previously recognized in the Appalachian basin In 9 of 18 localities, lycopod abundance decreases upward within coal beds, whereas at the other nine localities, no statistically significant trends in lycopod abundance were observed. An upward decrease in lycopod abundance is suggestive of coal that formed in the central region of a domed peat swamp, but peat-dome formation is not demonstrated. Within coal beds, pteridosperms are most abundant in samples which are split or contain abundant mineral matter.