Advanced mineral characterization and petrographic analysis by -EDXRF, LIBS, HSI and hyperspectral data merging
Advanced mineral characterization and petrographic analysis by -EDXRF, LIBS, HSI and hyperspectral data merging
复制标题
DOI：
10.1007/s00710-019-00657-z
复制
发表时间：
2019-06-01
影响因子：
1.8
通讯作者：
Schodlok, Martin C.
中科院分区：
文献类型：
--
作者：
Nikonow, Wilhelm;Rammlmair, Dieter;Schodlok, Martin C.
岩石学和矿物学是理解各种地球科学领域过程的基础。深成岩的命名是以矿物组成为基础的。因此，矿物的识别和定量是深部岩体分类的关键。为了实现这一目标，仪器的新进展，如能量色散x射线荧光映射（-EDXRF）或高光谱成像（HSI）提供了快速和非破坏性的空间分辨和大规模化学信息。这项工作描述了一种综合方法，将化学、矿物学和结构信息从-EDXRF、激光诱导击穿光谱（LIBS）和HSI结合起来，用于深部岩石的岩石学分析。利用光谱信息的监督分类，获得了用于图像分析的矿物分布图，包括每个颗粒的几何数据，如粒度、晶粒取向和颗粒位置，以便后续的针对性分析，并在20块岩板的qapf图中获得了用于深部岩石分类的矿物学模态。三种制图技术的结合可以在每种技术的空间分辨率或元素灵敏度等限制内提供有价值的信息，但样品制备和测量所需的时间很少。总的来说，它是一种客观的、可重复的、可量化的模态矿物学和岩石学图像分析方法。
Petrography and mineralogy are fundamental for understanding processes in various geoscientific fields. Plutonic rock nomenclature is based on mineralogical composition. Therefore, identifying and quantifying minerals is a key for plutonic rock classification. To accomplish this, novel advancements in instrumentations, such as energy dispersive x-ray fluorescence mapping (-EDXRF) or hyperspectral imaging (HSI) provide fast and non-destructively spatially resolved and large-scale chemical information. This work describes a comprehensive approach to combine chemical, mineralogical and textural information from -EDXRF, Laser Induced Breakdown Spectroscopy (LIBS) and HSI for petrographic analysis of plutonic rocks. Using supervised classification of spectral information, mineral distribution maps are obtained for image analysis including geometrical data of each grain, such as grain size, grain orientation and grain location for subsequent targeted analysis and the modal mineralogy for plutonic rock classification in a QAPF-diagram for 20 rock slabs. The combination of the three mapping techniques can provide valuable information within the limit of each technique such as of spatial resolution or element sensitivity, but with little time needed for sample preparation and measurement. In general, it is an objective, repeatable and quantifiable way for modal mineralogy and petrographic image analysis.