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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Aliphatic and aromatic biomarkers from Carboniferous coal deposits at Dunbar (East Lothian, Scotland): Palaeobotanical and palaeoenvironmental significance
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Aliphatic and aromatic biomarkers from Carboniferous coal deposits at Dunbar (East Lothian, Scotland): Palaeobotanical and palaeoenvironmental significance

机译：Dunbar（苏格兰东洛锡安）石炭纪煤沉积物中的脂肪族和芳香族生物标志物：古植物学和古环境意义

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摘要

Carboniferous (Viséan) coals from Dunbar, East Lothian, Scotland, contain well-preserved miospore and megaspore assemblages suggesting a lycopod-dominated forest ecosystem with some ferns, sphenopsids and pteridosperms. The low rank of the coals and the well defined microflora permit assessment of the palaeoenvironmental significance of lipid biomarkers during the Early Carboniferous. Rock-Eval, petrographic, and lipid analyses indicate a fully terrestrial depositional environment. Although we also present and discuss a wide diversity of other lipid biomarkers (alkanes, hopanoids, steroids), we focus on the terrestrial-derived biomarkers. Combustion-derived PAHs pyrene, fluoranthene, benzo[a]anthracene, chrysene and triphenylene indicate the occurrence of forest fires in the study areas during Early Carboniferous times. Alkyldibenzofurans are considered to derive from lichen-biomass. Retene, cadalene, simonellite, tetrahydroretene and kaurane are poorly specific and can derive from a variety of early Palaeozoic land plants. Abietane, phyllocladane, ent-beyerane and 4β(H)-eudesmane, as well as bisnorsimonellite, diaromatic totarane, diaromatic sempervirane and 2-methylretene, however, as yet had only been reported from conifers, which do not appear in the fossil record until the Late Carboniferous. Within the lower Carboniferous forest ecosystem, arborescent lycopsids and pteridosperms are proposed as alternative sources for these compounds.
机译：来自苏格兰东洛锡安邓巴的石炭（维塞安）煤包含保存完好的微孔和大孢子组合，表明以番茄科植物为主的森林生态系统中有一些蕨类，蝶类和蕨类植物。煤的低等级和明确的微生物区系允许评估石炭纪早期脂质生物标志物的古环境意义。岩石评估，岩相学和脂质分析显示出完全的陆地沉积环境。尽管我们也提出并讨论了多种其他脂质生物标志物（烷烃，类胡酚碱，类固醇），但我们还是着眼于陆生生物标志物。燃烧衍生的多环芳烃pyr，荧蒽，苯并[a]蒽，和联苯表明在石炭纪早期发生了森林大火。烷基二苯并呋喃被认为衍生自地衣生物质。视黄醛，卡达琳烯，堇青石，四氢视黄烯和金刚烷的特异性较差，可以源自多种早期的古生代陆地植物。然而，松柏油，叶金刚烷，对羟基苯丙醚和4β（H）-eudesmane以及双norsimonellite，重芳金属戊烷，重芳金属戊烯和2-甲基retene尚未被报道，但直到化石记录才出现。晚石炭纪。在石炭纪下层森林生态系统内，提出了树状的番茄红素和蕨类植物作为这些化合物的替代来源。

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