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首页> 外文期刊>Marine and Petroleum Geology >Characterization of compounds in unresolved complex mixtures (UCM) of a Mesoproterzoic shale by using GC x GC-TOFMS
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Characterization of compounds in unresolved complex mixtures (UCM) of a Mesoproterzoic shale by using GC x GC-TOFMS

机译：使用GC x GC-TOFMS表征中元古代页岩的未解析复杂混合物（UCM）中的化合物

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Unresolved complex mixtures (UCM) in shales have important implications for organic matter formation and diagenesis. However, their origin is not well understood, one important reason for this is lacking the knowledge of their molecular compositions. Here, using the comprehensive two-dimensional gas chromatography (GC x GC) coupled with time-of-flight mass spectrometry (TOFMS), we conduct a pilot study based on a Mesoproterozoic black shale from North China. Detailed identification of compounds was made and a possible new origin was suggested. Results show that the separation of UCM hydrocarbons by a reversed-phase column system (polaron-polar) is efficient for the identification of molecular composition of UCM. The UCM in the shale is composed mainly of C-11-C-27 compounds, including paraffin hydrocarbons, cycloalkanes and aromatics, in particular 1-3 cyclic paraffins with a short-chain alkyl group, multi-branched isoparaffins and their homologous series, which are indicative of isomerization of molecules intensively. This implies that the origin of the UCM might include the isomerization of organic molecules in addition to the commonly-thought microbial activities. This study improves the understanding of the geochemical compositions and origin of UCM in shales. (C) 2015 Elsevier Ltd. All rights reserved.
机译：页岩中未解决的复杂混合物（UCM）对有机质形成和成岩作用具有重要意义。然而，它们的起源尚未得到很好的理解，其重要原因之一是其分子组成的知识不足。在这里，我们使用全面的二维气相色谱（GC x GC）和飞行时间质谱（TOFMS），基于来自中国北方的中元古代黑色页岩进行了一项初步研究。详细鉴定了化合物，并提出了可能的新来源。结果表明，通过反相柱系统（极性/非极性）分离UCM烃对于识别UCM的分子组成是有效的。页岩中的UCM主要由C-11-C-27化合物组成，包括链烷烃，环烷烃和芳烃，尤其是带有短链烷基的1-3个环状链烷烃，多支链异链烷烃及其同源序列，指示了分子的强烈异构化。这意味着，UCM的起源除了通常认为的微生物活性外，还可能包括有机分子的异构化。这项研究提高了对页岩中UCM的地球化学组成和成因的理解。 （C）2015 Elsevier Ltd.保留所有权利。

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