The majority of Middle Devonian coal samples from Wujing (WJ), Damo (DM), and Batang (BT) areas in the Luquan region of China have cutinite content exceeding 50%, classifying them as typical cutinitic liptobioliths. These coals are notable for their thinly-bedded texture, which allows them to split readily into leaf-like laminae. However, coals from these areas display distinct macroscopic, microscopic, and geochemical features. The split laminae from WJ and DM coals are black and ribbon-like, with those from WJ being notably longer and wider. In contrast, BT coal laminae are irregular, small fragments with golden or brown hues. Correspondingly, the cutinite in WJ coals is predominantly thick-walled, DM coals primarily contain a medium-walled type, and BT coals are characterized by a thin-walled type. Additionally, BT coals are rich in sporinite, with some classified as sporinite-rich durain or sporinitic liptobiolith. Abundant tetracyclic diterpenoids were detected in the maltene fraction of all the coal extracts. The concentration and composition of these diterpenoids are influenced by the content and type of cutinite present in the coals. The presence of tetracyclic diterpenoids, with beyerane, atisane and kaurane skeletons, had already evolved in early land plants. This implies that the precursors of these compounds were likely significant components of the cuticles of early land plants or, at least coexisted alongside plant cuticles. The spore assemblages in coals and the microscopic features of cutinite suggest that the coal-forming plants of the Luquan cutinitic liptobioliths were early land plants, predominantly herbaceous lycopsids, rhyniopsids, and . However, it is important to note that the specific types of these coal-forming plants may vary by areas. This variation leads to the distinctive macroscopic and microscopic characteristics observed in coals from different locations.

中文翻译：

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云南禄劝地区中泥盆世角质脂生物岩的岩石学和有机地球化学

鹿泉地区吴泾、达摩、巴塘地区中泥盆统煤样的角质质含量大多超过50%，属于典型的角质质脂生物岩。这些煤炭以其薄层结构而闻名，这使得它们很容易分裂成叶状薄片。然而，这些地区的煤炭表现出独特的宏观、微观和地球化学特征。 WJ 和 DM 煤的裂片呈黑色、带状，其中 WJ 煤的裂片明显更长更宽。相比之下，BT 煤纹层是不规则的小碎片，呈金色或棕色。相应地，WJ煤中的角质体以厚壁型为主，DM煤以中壁型为主，BT煤以薄壁型为主。此外，BT煤富含孢子体，其中一些被归类为富含孢子体的硬石或孢子石脂生物石。在所有煤提取物的马耳他烯部分中均检测到丰富的四环二萜类化合物。这些二萜类化合物的浓度和组成受到煤中角质层的含量和类型的影响。具有拜尔烷、阿提烷和贝壳烷骨架的四环二萜类化合物已经在早期陆地植物中进化出来。这意味着这些化合物的前体可能是早期陆地植物角质层的重要组成部分，或者至少与植物角质层共存。煤中的孢子组合和角质体的微观特征表明鹿泉角质脂生物石的成煤植物是早期陆地植物，主要​​是草本石松类、菱形类和。然而，值得注意的是，这些燃煤电厂的具体类型可能因地区而异。这种变化导致在不同地点的煤炭中观察到独特的宏观和微观特征。