Deciphering the Nature of 'Graphite' in Geological Samples with the Use of Laser Raman Microprobe Spectroscopy

虽然拉曼光谱学在材料分析中已经被认识很久， 科学和固体物理学作为研究的有力工具 碳质材料（CM），它几乎没有被用来研究 “石墨”在地质利益的样品。 总目标 评价激光拉曼微探针（LRM）的实用性 光谱学来表征天然存在的CM。 为 LRM分析的目的，几套渐进的 已经获得了变质的CM，其中大部分已经具有 进行其他分析，例如通过X射线衍射（XRD）和 透射电子显微镜（TEM）。目的是 开发常规LRM方法1）提供相对快速的 “石墨”的结晶度的评价及其 与纯碳的组成偏差和2）作为 尽可能地量化碳的种类。 研究结果对于了解 含碳岩石

Although Raman spectroscopy long has been recognized in material science and solid state physics as a powerful tool for the study of carbonaceous materials (CM), it has barely been used to study "graphite" in samples of geological interest. The overall goal is to evaluate the usefulness of laser Raman microprobe (LRM) spectroscopy to characterize naturally occuring CM. For the purpose of LRM analysis, several suites of progressively metamorphosed CM have been obtained, most of which already have undergone other analyses, such as by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The intention is to develop a routine LRM methodogy 1) to provide relatively rapid evaluation of the degree of crystallinity of "graphite" and its compositional deviations from pure carbon and 2) to be as quantitative as possible in characterizing the kind of carbon. The results will be important in understanding the history of carbon-bearing rock.