微区X射线荧光成像技术在岩心分析中的应用

微区X射线荧光（Micro-XRF）分析技术是通过微小的X射线光束照射样品，对样品进行原位成分观测的无损分析手段之一，具有灵敏度高、速度快和准确性高的特点。采用微区X射线荧光光谱仪（M6 JETSTREAM）对安徽铜陵冬瓜山铜矿床四段岩心样品进行面扫描，分析不同矿层共17种元素区域分布特征、空间分布规律及组合关系等，结果表明：（1）Cu和Fe两种成矿元素高值空间分布区域基本不重叠，S与Fe分布范围高度重叠，关系密切，微量元素Ni，Bi，Pb，Zn，Si，Na与Cu密切相关，而Ti，Al，K与Fe具有弱相关性；（2）垂向上，Fe元素含量随深度增加逐步增大，而Cu元素含量呈降低趋势，其他元素也随深度呈下降趋势；（3）元素分布受石炭纪中期海底喷流沉积成矿作用和岩浆热液成矿作用叠加改造作用明显；（4）该钻孔矿石矿物以磁黄铁矿、黄铜矿和黄铁矿为主，垂向上组合规律明显，脉石矿物以石英、石榴子石和透辉石为主。该技术通过分析元素空间分布规律、相关性以及矿物组合和分配关系等可对元素富集和运移以及对矿床的成矿机制、成因模式等地质环境和地质过程提供新认识和新证据。结合矿床地球化学特征的分布模式，微量元素可作为寻找主矿种的指示元素，为深部找矿提供依据。此外，该技术能作为预分析技术快速筛选出感兴趣的信息和位置，为后期各种更高精度的微区分析提供不同尺度、不同层次的元素分布信息。

Application of Micro X-Ray Fluorescence Imaging Technology in Core Analysis

Micro-XRF analysis technology is one of the non-destructive analysis methods that use tiny X-Ray beams to irradiate samples and then analyze fluorescence spectra and observe the components of the samples. It has the characteristics of high sensitivity, high efficiency and high accuracy. In this experiment, The Micro-XRF spectrometer (M6 JETSTREAM) was used to scan the core samples of the ZK3801 drilling in Dongguashan copper mine, Anhui province. It can analyze the distribution characteristics and combination relationships of 17 elements in different parts. The results show that (1)The high-value spatial distribution regions of Cu and Fe do not overlap basically, and the distribution ranges of S and Fe are highly overlapped, Ni, Bi, Pb, Zn, Si and Na are closely related to Cu, while Ti, Al and K have a weak correlation with Fe; (2)In the vertical direction, as increasing depth, the content of Fe increases gradually, while the content of Cu and other elements shows a decreasing trend; (3) The element distribution is modified by the middle Carboniferous submarine jet sedimentation and mineralization and magmatic-hydrothermal mineralization;(4) The ore minerals of the drill hole are mainly pyrrhotite, chalcopyrite and pyrite, with a certain combination law in the vertical direction. The gangue minerals are mainly quartz, garnet and diopside; Analyzing the spatial distribution of elements, correlations, and mineral combinations and distribution relationships can provide new understanding and new evidence for the enrichment and migration of elements, mineralization mechanisms, genetic models, and environmental, geological processes. Moreover, combined with the distribution pattern of the geochemical halo of the deposit, trace elements can be used as indicator elements to find the main mineral species and provide a basis for deep prospecting. Additionally, it can filter out the information and location that we are interested in quickly. It can provide powerful technical support for different scales and different levels of requirements for screening various fine parameters in the later stage.