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Microbial mediation of textures and minerals – terrestrial or parent body processes?
Open Astronomy ( IF 0.7 ) Pub Date : 2019-01-01 , DOI: 10.1515/astro-2019-0004
Márta Polgári 1 , Ildikó Gyollai 2 , Szaniszló Bérczi 3 , Miklós Veres 4 , Arnold Gucsik 5 , Pál-Molnár Elemér 6
Affiliation  

Abstract Evolution of chondritic parent body is influenced by thermal, impact metamorphism and aqueous alteration, studied in Mező-Madaras, Knyahinya, Mócs and Nyírábrány in aspect of high resolution in situ textural, mineralogical and organic geochemical characteristics, using optical microscopy, FTIR-ATR and Raman spectroscopy. Our observations focused on Fe-containing opaque grains, glass, olivines and pyroxenes, which were well populated by micrometer-sized microbial filamentous elements in their boundary region within matrix and inside the minerals resembling mineralized microbially produced textures (MMPT), affecting 70-80 vol% of samples. In MMPT iron oxides (ferrihydrite, goethite), olivine, montmorillonite, kandite minerals and various hydrocarbon compounds were identified. (1) Data confirmed dense and invasive terrestrial microbially mediated contamination in the chondrites, supported by microtexture, micromineralogy and embedded organic compounds. As the classical transformation processes are supposed nowadays to have been happened on the parent bodies, a contradiction arose: how could it be that these classical products are manifested in microbially mediated texture? (2) Based on terrestrial analogies, microbial mediation is a sudden process comparing to geological times, very ancient, widespread and occur in various environments under determined conditions. It can consume previous and also produce new minerals. After formation, MMPT can survive billions of years proposing occurrence on parent bodies.

中文翻译:

质地和矿物质的微生物介导——陆地或母体过程?

摘要 在 Mező-Madaras、Knyahinya、Mócs 和 Nyírábrány 使用光学显微镜、FTIR-ATR 在高分辨率原位结构、矿物学和有机地球化学特征方面研究了球粒陨石母体的演化受热、冲击变质和水蚀变的影响和拉曼光谱。我们的观察集中在含铁的不透明颗粒、玻璃、橄榄石和辉石上,这些颗粒在基质内的边界区域和类似于矿化微生物产生的纹理 (MMPT) 的矿物内部充满微米级微生物丝状元素,影响 70-80样品的体积百分比。在 MMPT 氧化铁(水铁矿、针铁矿)中,鉴定出橄榄石、蒙脱石、康奈德矿物和各种碳氢化合物。(1) 数据证实了球粒陨石中密集和侵入性的陆地微生物介导的污染,得到了微观纹理、微观矿物学和嵌入有机化合物的支持。由于现在人们认为经典的转化过程已经发生在母体上,因此出现了一个矛盾:这些经典产品怎么会以微生物介导的质地表现出来?(2) 基于陆地类比,微生物介导与地质时代相比是一个突然的过程,非常古老、广泛,在确定的条件下发生在各种环境中。它可以消耗以前的矿物质,也可以产生新的矿物质。形成后,MMPT 可以存活数十亿年,建议在母体上发生。由于现在人们认为经典的转化过程已经发生在母体上,因此出现了一个矛盾:这些经典产品怎么会以微生物介导的质地表现出来?(2) 基于陆地类比,微生物介导与地质时代相比是一个突然的过程,非常古老、广泛,在确定的条件下发生在各种环境中。它可以消耗以前的矿物质,也可以产生新的矿物质。形成后,MMPT 可以存活数十亿年,建议在母体上发生。由于现在人们认为经典的转化过程已经发生在母体上,因此出现了一个矛盾:这些经典产品怎么会以微生物介导的质地表现出来?(2) 基于陆地类比,微生物介导与地质时代相比是一个突然的过程,非常古老、广泛,在确定的条件下发生在各种环境中。它可以消耗以前的矿物质,也可以产生新的矿物质。形成后,MMPT 可以存活数十亿年,建议在母体上发生。与地质时代相比,微生物介导是一个突然的过程,非常古老、广泛,并在确定条件下发生在各种环境中。它可以消耗以前的矿物质,也可以产生新的矿物质。形成后,MMPT 可以存活数十亿年,建议在母体上发生。与地质时代相比,微生物介导是一个突然的过程,非常古老、广泛,并在确定的条件下发生在各种环境中。它可以消耗以前的矿物质,也可以产生新的矿物质。形成后,MMPT 可以存活数十亿年,建议在母体上发生。
更新日期:2019-01-01
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