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微生物-矿物相互作用实验和密度函数理论计算揭示了有机成分对石表面的多洛米化产生加速效应

Xiao Gao¹, Zuozhen Han¹, Yanyang Zhao¹

¹Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China; Laboratory for Marine Mineral Resources, Center for Isotope Geochemistry and Geochronology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.

The Science of the total environment

|January 11, 2024

概括

微生物和有机化合物显著增强融入石,促进多洛米特的形成. 这项研究阐明了微生物在多洛米化中的作用,为研究矿物与微生物相互作用开辟了新的途径.

科学领域:

地质化学地质化学
生物地质化学生物地质化学
矿物学是什么?矿物学是什么?

背景情况:

碳酸盐岩石在地球地中至关重要,与微生物活动有关.
富含的碳酸盐如多洛米特的形成机制仍在争论中.
了解有机物和微生物在dolomitization中的作用是必不可少的.

研究的目的:

研究有机成分和微生物对离子沉的特定影响.
阐明在有机物和微生物的存在下,多洛米特形成背后的机制.

主要方法:

进行了各种设置的多洛米化实验,包括八种氨基酸和微生物.
使用密度函数理论 (DFT) 计算了Mg[6(H₂O) ]²⁺脱水和有机复合体 (OMC) 的吉布斯自由能量.
使用了先进的分析技术:XRD,SEM-EDS,TEM,XPS,FTIR和HRTEM用于材料表征.

主要成果:

在与有机溶液 (OMS) 反应时,离子被纳入石晶格.
在微生物的存在下,在石灰岩表面观察到多洛米特岩石的形成.
DFT的计算显示,与直接的Mg[6(H₂O) ]²⁺脱水相比,氨基酸和OMC结合的Gibbs自由能量障碍较低,表明降水增加.

结论:

有机成分和微生物共同增强离子沉,促进多洛米化.
实验和理论发现强调了微生物与矿物相互作用在多洛米特形成中的关键作用.
这项研究建立了一个新的研究方向,专注于dolomitization的生物地球化学过程.

关键词:

杜洛米提化 (Dolomitization) 是一个多罗米提化过程.离子沉降水情况微生物-矿物相互作用有机复合物有机复合物

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