Rapid, direct and non-destructive assessment of fossil organic matter via microRaman spectroscopy
Rapid, direct and non-destructive assessment of fossil organic matter via microRaman spectroscopy
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DOI：
10.1016/j.carbon.2016.07.039
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发表时间：
2016-11-01
期刊：
影响因子：
10.9
通讯作者：
Summons, Roger E.
中科院分区：
文献类型：
--
作者：
Ferralis, Nicola;Matys, Emily D.;Summons, Roger E.
拉曼光谱被广泛用于评估地球最古老的岩石和矿物中碳质物质的性质和潜在来源。它也是下一个远程探索火星表面的飞行器上用于有机探测的工具。在这里，我们提出了，第一次，一种新的定量方法，其中以前被忽视的拉曼光谱特征直接相关，线性，并具有良好的精度，通过元素H：C比的碳质材料的微观化学，无论污染。我们显示这种方法的适用性和预测能力，在太古代和III型干酪根在0.01和0.65之间的H：C比率进行评估。我们展示了它的应用化学显微拉曼映射的统计分析750马微体化石及其周围的沉积物。拉曼衍生的H：C数据也可以用来估计干酪根C同位素数据由于变质作用而从其原始值偏移的程度。这种新方法直接和非侵入性地提供了对任何地质保存的陆地或地球外样本中有机物保存和微尺度化学多样性的空间分辨评估，包括在技术应用中使用有机物。(C)2016爱思唯尔有限公司版权所有。
Raman spectroscopy is widely used to evaluate the nature and potential origins of carbonaceous matter in Earth's oldest rocks and minerals. It is also the tool that will be used for organic detection on the next vehicles to remotely explore the surface of Mars. Here we present, for the first time, a novel quantitative method in which previously neglected Raman spectral features are correlated directly, linearly, and with excellent accuracy, to the microchemistry of carbonaceous materials through the elemental H:C ratio, regardless of contamination. We show applicability and predictive capabilities of this methodology in evaluating H:C ratios between 0.01 and 0.65 in Archean and type III kerogens. We demonstrate its application to chemical microRaman mapping by statistical analysis of a 750Ma microfossil and its encompassing sediments. Raman-derived H:C data can also be used to estimate the degree to which kerogen C-isotopic data has been shifted from its original values due to the effects of metamorphism. The new methodology directly and non-invasively affords spatially resolved assessments of organic matter preservation and microscale chemical diversity within any geologically preserved terrestrial or extraterrestrial sample, including in the use of organic matter in technological applications. (C) 2016 Elsevier Ltd. All rights reserved.