煤中惰质组在泥炭沼泽古环境研究中的应用  

Inertinite of Coal-Rocks and Its Application to the Paleoenvironment Reconstruction of Peat and Mire

作　　者：王岩[1] 李丽琴[2,3] 张筱青[2,3] 

机构地区：[1]西南石油大学地球科学与技术学院,成都610500 [2]中国科学院南京地质古生物研究所,南京210008 [3]中国科学院大学,北京100049

出　　处：《地质论评》2016年第2期375-380,共6页Geological Review

基　　金：国家重点基础研究发展计划(973)项目(编号:2012CB822003);中国科学院知识创新主要方向性项目(编号:KZCX-2-YW-154);中国科学院科技创新交叉与团队合作项目联合资助的成果;国家自然科学基金项目(编号:41272010;41572014)~~

摘　　要：惰质组是煤中一种常见的显微组分。它不仅能用来鉴别成煤前植物的木炭化程度,而且还是泥炭沼泽古环境恢复的有效途径。近年来,欧洲学者利用惰质组成功推算了地史时期三叠纪—侏罗纪之交(T—J)的古火灾温度及类型,并重建了古植被类型及泥炭沼泽古生态环境变化。与其它方法相比,利用煤中惰质组含量及其反射率进行古环境恢复的工作对于植物种类繁多、沉积岩层中夹杂的煤层或煤炭、尤其对于古气候环境波动较大的地质转折时期最为理想。因此,利用惰质组的部分参数对我国含煤沉积盆地的古生态恢复以及成煤环境的研究有积极的借鉴意义。Objectives： Inertinite of coal-rocks is a common micropetrological unit of coal and is transformed from fibrous tissue of woods. The inertinite not only identifies carbonization level of plants before forming coals, but also is an effective approach to reconstruct the paleoenvironment of peat and mire. In recent years, many European scientists have successfully used inertinite of coal-rocks to calculate the wildfire temperature across the Triassic-Jurassic （T-J） boundary in the geologic history, recover the vegetation type and discover the paleoenvironment changes of peat and mire. Methods：Coal and coal beds are ideal materials to study wildfire of ancient forests, and inertinite reflectance is used to determine the type of fire activities. Inertinite have connections with burning temperatures. The relevance between them can be described approximately in a linear equation, t = 184.10 ＋ 117.76Ro （R^2 = 0.91 ）. In this equation, t is burning temperature （ ℃）, Ro is inertinite reflectance and R is correlation coefficient. According to different burning temperatures, wildfire can be divided into 3 300℃）, surface fires （ about 600℃ ） and crown fires （ 800℃ reflectance, the grinded coal-rock samples are embedded in different types, including ground fires （about or more）. In order to measure the inertinite epoxy resin, then are polished and abraded, determined by monochromatic light. These results are drawn into a histogram, and then get the average inertinite reflectance through calculation. The auto-counter can spot the maceral and the mineral composition in the total of 500 samples, and form an arrow diagram with even space. The inertinite reflectance （Ro） can be calculated by counting the ratio of the maceral in the total volume of the samples. Results： Several researches have demonstrated that the inertinite reflectance increases when the fire temperature gets higher, for the aromatization in the process of carbonation. The burning temperatures can be calculated through

关 键 词：煤中惰质组 反射率 古火灾 泥炭沼泽 古环境 

分 类 号：P618.11[天文地球—矿床学]