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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Diamondoids and molecular biomarkers generated from modern sediments in the absence and presence of minerals during hydrous pyrolysis
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Diamondoids and molecular biomarkers generated from modern sediments in the absence and presence of minerals during hydrous pyrolysis

机译：在水热解过程中不存在矿物质和不存在矿物质的情况下，现代沉积物生成的类金刚石和分子生物标记

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Experimental work involving artificial maturation of modern sediments was carried out to determine if diamondoids can be generated from biosynthetic precursors abundant in modern sediments. Mineral catalysts of distinctive properties, including montmorillonite K10, acidic aluminosilicate and CaCO3 were used in the hydrous pyrolysis of organic-rich modern sediments to examine which type of catalyst is active and effective in the production of diamondoids. Our results show that diamondoids are absent from modern sediments lacking petroleum contamination. Hydrous pyrolysis at 340 degrees C indicates that they are created coincidently with the formation of biomarkers, as the artificial maturation of organic matter proceeds. The generation of diamondoids is more significant in the presence of montmorillonite K10 and acidic aluminosilicate. This suggests that these clay minerals have a significant catalytic effect on the formation of diamondoids, and may catalyze diamondoid synthesis via carbonium ion mechanisms resulting from Lewis acid sites available on their surface. In contrast, CaCO3 has an inhibitive effect on the generation of diamondoids as well as on published diamondoid maturity parameters such as MAI and MDI. The formation of 3,4-dimethyldiamantane (DMD), 4,8-DMD, and 4,9-DMD is demonstrated to be source related. The sediment mineralogy can change the composition and distribution of both triterpanes and steranes by either catalyzing isomerization of biomarkers or cracking of side chains. Source biomarker parameters (e.g., C(24)Tet/C23TT, C-30(*)/C29Ts, C-27:C-28:C-29 steranes) are more sensitive to the addition of minerals including montmorillonite K10, acidic aluminosilicate and CaCO3 than are maturity indicators. Our results also suggest that CaCO3 has a remarkable effect on the isomerization of hopanes at the ring system. Isomerization of steranes is probably not clay-mediated, as indicated by only minor variations in isomerization ratios, including C-29 stigmastane beta beta/(beta beta + alpha alpha) and C-29 alpha alpha alpha-sterane 20S/(20S + 20R) observed in the presence of clay minerals. (c) 2006 Elsevier Ltd. All rights reserved.
机译：进行了涉及现代沉积物人工成熟的实验工作，以确定类金刚石是否可以由现代沉积物中丰富的生物合成前体产生。具有矿物特性的矿物催化剂，包括蒙脱石K10，酸性铝硅酸盐和CaCO3，用于富含有机物的现代沉积物的水热解中，以检查哪种类型的催化剂在生产类金刚石时是有效的和有效的。我们的结果表明，缺乏石油污染的现代沉积物中没有类金刚石。 340℃下的含水热解表明，随着有机物的人工成熟，它们的生成与生物标记的形成同时发生。在蒙脱石K10和酸性铝硅酸盐的存在下，类金刚石的生成更为重要。这表明这些粘土矿物对类固醇的形成具有显着的催化作用，并可能通过其表面上可用的路易斯酸位点产生的碳离子机制催化类固醇的合成。相反，CaCO3对类金刚石的生成以及已发布的类金刚石成熟度参数（例如MAI和MDI）具有抑制作用。 3,4-二甲基二金刚烷（DMD），4,8-DMD和4,9-DMD的形成与来源有关。沉积物的矿物学可以通过催化生物标志物的异构化或侧链的断裂来改变三萜烷和甾烷的组成和分布。来源生物标志物参数（例如C（24）Tet / C23TT，C-30（*）/ C29Ts，C-27：C-28：C-29甾烷）对添加矿物（包括蒙脱石K10，酸性硅铝酸盐）更敏感和碳酸钙比是成熟度指标。我们的结果还表明，CaCO3对环体系中of烷的异构化具有显着影响。甾烷的异构化可能不是由粘土介导的，正如异构化比率的微小变化所表明的那样，包括C-29柱头烷β-β/（β-β+α-α）和C-29-α-αα-甾烷20S /（20S + 20R） ）在粘土矿物存在下观察到。 （c）2006 Elsevier Ltd.保留所有权利。

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