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首页> 美国卫生研究院文献>Scientific Reports >Hydrocarbons in phlogopite from Kasenyi kamafugitic rocks (SW Uganda): cross-correlated AFM confocal microscopy and Raman imaging
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Hydrocarbons in phlogopite from Kasenyi kamafugitic rocks (SW Uganda): cross-correlated AFM confocal microscopy and Raman imaging

机译：来自Kasenyi kamafugitic岩石（乌干达西南部）的金云母中的碳氢化合物：互相关AFM共聚焦显微镜和拉曼成像

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This study presents a cross-correlated surface and near surface investigation of two phlogopite polytypes from Kasenyi kamafugitic rocks (SW Uganda) by means of advanced Atomic Force Microscopy (AFM), confocal microscopy and Raman micro-spectroscopy. AFM revealed comparable nanomorphology and electrostatic surface potential for the two mica polytypes. A widespread presence of nano-protrusions located on the mica flake surface was also observed, with an aspect ratio (maximum height/maximum width) from 0.01 to 0.09. Confocal microscopy showed these features to range from few nm to several μm in dimension, and shapes from perfectly circular to ellipsoidic and strongly elongated. Raman spectra collected across the bubbles showed an intense and convolute absorption in the range 3000–2800 cm−1, associated with weaker bands at 1655, 1438 and 1297 cm−1, indicating the presence of fluid inclusions consisting of aliphatic hydrocarbons, alkanes and cycloalkanes, with minor amounts of oxygenated compounds, such as carboxylic acids. High-resolution Raman images provided evidence that these hydrocarbons are confined within the bubbles. This work represents the first direct evidence that phlogopite, a common rock-forming mineral, may be a possible reservoir for hydrocarbons.
机译：这项研究通过先进的原子力显微镜（AFM），共聚焦显微镜和拉曼显微光谱技术，对来自Kasenyi kamafugitic岩石（SW乌干达）的两种金云母多态性进行了相互关联的表面和近表面研究。原子力显微镜显示两种云母多型可比的纳米形态和静电表面电势。还观察到了位于云母薄片表面上的纳米突起的广泛存在，其长宽比（最大高度/最大宽度）为0.01至0.09。共聚焦显微镜显示这些特征的尺寸范围从几纳米到几微米不等，形状从完美的圆形到椭圆形，并且强烈拉长。在气泡上收集的拉曼光谱显示出在3000–2800 cm -1 范围内强烈而回旋的吸收，与1655、1438和1297 cm -1 的较弱谱带相关，表明存在由脂肪族烃，烷烃和环烷烃以及少量含氧化合物（例如羧酸）组成的流体包裹体。高分辨率拉曼图像提供了这些碳氢化合物被限制在气泡内的证据。这项工作代表了金云母（一种常见的成岩矿物）可能是碳氢化合物的潜在储层的第一个直接证据。

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