煤的显微组分定义与分类(ICCP system 1994)解析Ⅲ:腐植体

An in-depth interpretation of definition and classification of macerals in coal(ICCP system 1994)for Chinese Researchers,Ⅲ:Huminite

国际煤地质学杂志(International Journal of Coal Geology)在2005年发表了褐煤腐植体显微组分的分类方案。由于我国没有低阶煤中腐植体的显微组分分类方案,因此“ICCP System 1994”中关于腐植体的显微组分的定义和分类方案对我国学者更具有特殊的意义。该显微组分分类方案(ICCP system 1994)在原分类方案的基础上,对腐植体显微组分的分类进行了修订,以便能够使其与其他显微组分,特别是镜质体分类中的相关术语更相匹配。该分类方案将腐植体显微组分为3个亚组,分别是结构腐植体亚组、碎屑腐植体亚组、凝胶腐植体亚组;每个显微组分亚组又分为2个显微组分,显微组分可以进一步分为显微亚组分以至显微组分种。虽然本分类方案主要针对的褐煤(指腐植体平均随机反射率低于0.4%的低阶煤,或称之木质褐煤),但适合于褐煤和亚烟煤,主要是因为镜质体和腐植体,以及次级的显微组分亚组之间具有对应的关系,因此,“ICCP system 1994”分类方案的腐植体和镜质体2种分类体系可以并行使用。目前,在显微组分以及细化的分类方面,研究者可根据低阶煤的性质和分析目的,选择腐植体和镜质体2个分类体系中的其中一种使用。这与新的ISO煤的分类方法一致。在ISO分类中,也涵盖了低阶煤,并且提出,对于低阶煤可联合使用腐植体和镜质体2种分类方法。

The huminite classification system of lignite was published in 2005 by International Journal of Coal Geology.The definition and classification of huminite of the“ICCP System 1994”are of special significance for the Chinese researchers because there is no Chinese national standards of maceral classification for the low-rank coal.In the classification“ICCP system 1994”,the huminite has been revised from the previous classification to accommodate the nomenclature to changes in the other maceral groups,especially the changes in the vitrinite classification.The huminite in the classification system is subdivided into three maceral subgroups,telohuminite,detrohuminite and gelohuminite;each of the maceral subgroup is divided into two macerals,which are further subdivided into submacerals and even maceral variety.Although this classification system is mainly for lignite(low-rank coals with huminite reflectance less than 0.4%),it is practically applicable to lignite and subbituminous,because the vitrinite and huminite classification of“ICCP system 1994”have been correlated so that down to the level of sub-maceral groups.Therefore,the two classifications can be used in parallel.At the level of macerals and for finer classifications,the analyst now has,according to the nature of the coal and the purpose of the analysis,a choice of using either of two classification systems for huminite and vitrinite.This accordance with the new ISO Coal Classification that covers low-rank coals as well and allows for the simultaneous use of the huminite and vitrinite nomenclature for low-rank coals.