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在围绕Kedr-1泥火山,贝加尔湖的沉积物中的微生物多样性和authigenic siderite调解

Anna V Lomakina¹, Sergei V Bukin¹, Tatyana V Pogodaeva¹

¹Limnological Institute, SB RAS, Irkutsk, Russia.

|September 12, 2023

概括

贝加尔湖的含气酸盐的泥火山产出富含重碳同位素的 siderite 矿物质. 微生物群落分析揭示了与沉积物深度的 siderite 形成相关的独特集群和代谢潜力.

科学领域:

地质化学地质化学
微生物学微生物学
沉积物学的沉积物学

背景情况:

贝加尔湖的含气酸盐的泥火山Kedr-1位于Oligocene-Miocene煤炭载体沉积物附近,是天然气和液体的潜在来源.
矿石矿物 (FeCO3) 从湖底下327厘米深处收集到 (cmblf).
这些 siderite 样本在重13C同位素 (+33.3‰ VPDB) 中表现出极端的丰富.

研究的目的:

为了研究贝加尔湖沉积物中 siderite 矿物质的形成.
了解微生物群落在 siderite 沉中的作用.
用综合的地化学和分子数据建模地下 siderite 形成过程.

主要方法:

对 siderite 的矿物学和元素组成分析.
对 siderite (δ13C) 和在孔水中溶解的无机碳 (δ13C-DIC) 的碳同位素分析.
16S rRNA基因测序用于微生物社区分析和遗传学推断.

主要成果:

在 siderite δ13C,形态,元素组成和孔水 δ13C-DIC 的变化表明至少有两代 siderite 形成.
根据分类学,关键分类 (细菌和古生物) 和环境参数,确定了三个不同的微生物社区集群.
微生物的多样性和丰富性随着沉积物深度的下降而减少;深沉积物群体显示出潜在的有机化发酵,而甲基生物和甲基化物则在整个过程中存在.

结论:

发生了多个 siderite 形成事件,受不同的微生物群落和地化学条件的影响.
微生物代谢,包括有机性发酵和甲基生成/甲性,在 siderite 沉中起着重要作用.
综合数据支持开发贝加尔湖地下 siderite 形成模型.

关键词:

mcrAA 在线观看 16S rRNA 基因是16S 的基因.贝加尔湖是贝加尔湖的一个.微生物群落中的微生物群落.下一代测序 (NGS) 是指下一代的测序.这里有 siderites 和 siderites 的结论.

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