【摘要】 通过对淮南煤田张集煤矿9个煤层的33个煤样稳定有机碳同位素的分析,研究了碳同位素值(δ13C)在煤层中的分布特征和变化趋势。研究表明:张集煤矿煤的δ13C值范围为-23.44‰～-25.37‰,平均-24.18‰,不同煤层的δ13C值范围不同,为煤层识别和对比提供了新的依据;自下而上由4-1煤至11-2煤层碳同位素均值呈波动变化,在6煤和9-1煤处分别达到极小值和极大值,这种差异反应了不同煤层的成煤植物生长时期古环境的变化,特别是大气中CO2和温度的变化,与沉积环境也存在着相关性。更多还原

【Abstract】 Based on stable organic carbon isotopic analysis for 33 coal samples from 9 coal seams in the Zhangji coalmine,Huainan coalfield,have studied distribution characteristics and variation trend of the carbon isotope ratio(δ13C).The study shows: the δ13C range in the coalmine is from-23.44‰~25.37‰,average-24.18‰.The ratio range is different in different coal seams,thus provides another basis for coal seams correlation.From bottom to top,average δ13C in coal seams 4-1 to 11-2 presents undulated variation,while in coal 6 and coal 9-1 arrives at minimum and maximum respectively,such difference reflects paleoenvironment variation during coal plant growing period of different coal seams,especially CO2 and temperature variations of atmosphere,also correlativity with sedimentary environment is in existence.更多还原