Petrology and organic geochemistry of the Middle Devonian cutinitic liptobioliths from Luquan region, Yunnan Province, China

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Daofu Song , Tieguan Wang , Hao Wang , Honghe Xu , Zhengang Lu , Yue Liu
{"title":"Petrology and organic geochemistry of the Middle Devonian cutinitic liptobioliths from Luquan region, Yunnan Province, China","authors":"Daofu Song ,&nbsp;Tieguan Wang ,&nbsp;Hao Wang ,&nbsp;Honghe Xu ,&nbsp;Zhengang Lu ,&nbsp;Yue Liu","doi":"10.1016/j.coal.2024.104507","DOIUrl":null,"url":null,"abstract":"<div><p>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, <em>Orestovia</em> and <em>Spongiophyton</em>. 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.</p><p>Cutinitic liptobiolith appears to have been exclusive to the Middle Devonian period, especially during the Givetian. The emergence of this distinct coal type is likely due to the unique structure of Devonian land plants. Specifically, the combination of well-developed cuticles and less developed woody tissues in these early land plants might have played a key role in the formation of cutinitic liptobioliths.</p></div>","PeriodicalId":13864,"journal":{"name":"International Journal of Coal Geology","volume":"286 ","pages":"Article 104507"},"PeriodicalIF":5.6000,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Coal Geology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0166516224000648","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0

Abstract

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, Orestovia and Spongiophyton. 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.

Cutinitic liptobiolith appears to have been exclusive to the Middle Devonian period, especially during the Givetian. The emergence of this distinct coal type is likely due to the unique structure of Devonian land plants. Specifically, the combination of well-developed cuticles and less developed woody tissues in these early land plants might have played a key role in the formation of cutinitic liptobioliths.

中国云南省禄劝地区中泥盆统切屑岩岩体的岩石学和有机地球化学研究
来自中国禄劝地区吴井(WJ)、大莫(DM)和巴塘(BT)地区的大部分中泥盆世煤炭样本中的切晶石含量超过 50%,属于典型的切晶质薄片岩。这些煤炭的显著特点是其薄层质地,很容易裂成叶状层状。不过,这些地区的煤炭在宏观、微观和地球化学方面都有明显的特征。WJ 煤和 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 煤的煤层为不规则的小碎片,呈金黄色或棕色。相应地,WJ 煤中的角闪石主要为厚壁型,DM 煤主要为中壁型,而 BT 煤则为薄壁型。此外,BT 煤中还含有丰富的孢粉,其中一些被归类为富含孢粉的杜拉因或孢粉岩。在所有煤炭提取物的麦芽烯部分都检测到了丰富的四环二萜。这些二萜类化合物的浓度和组成受到煤中角闪石含量和类型的影响。在早期的陆地植物中,已经出现了以贝叶烷、阿蒂烷和考拉烷为骨架的四环二萜类化合物。这意味着这些化合物的前体很可能是早期陆生植物角质层的重要组成部分,或者至少与植物角质层共存。煤炭中的孢子组合和角闪石的显微特征表明,禄劝角闪石脂质体的成煤植物是早期陆生植物,主要是草本的狼尾草科、菱形草科、Orestovia 和 Spongiophyton。不过,值得注意的是,这些成煤植物的具体类型可能因地区而异。这种差异导致了在不同地区的煤炭中观察到的独特的宏观和微观特征。切屑岩褐煤似乎是中泥盆纪独有的,尤其是在给统时期。这种独特煤炭类型的出现可能是由于泥盆纪陆生植物的独特结构。具体来说,这些早期陆生植物中发达的角质层和不发达的木质组织的结合可能在角质岩浆岩的形成过程中起到了关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信