基于多种光谱学分析技术的地质样品宏微观组构特征研究——以钦杭成矿带南段金山银金矿床岩石样品为例

发布时间：2019-01-27 19:45

【摘要】：地质过程的复杂性造就了地质样品宏观和微观特征的不均一性,这些地质样品的不均一特征可以通过光谱学分析技术予以有效的揭示。研究以钦杭成矿带南段金山银金矿床的矿石与围岩样品为例,开展了基于X射线荧光光谱(XRF)和等离子体质谱(ICP-MS)分析技术的宏观地球化学特征和基于拉曼光谱(Raman)分析的微区特征分析。宏观地球化学分析结果表明,矿石与围岩的主量元素组成差别较大,但稀土元素配分模式和微量元素分布模式基本相似,这反映微量元素和稀土元素在成矿作用过程中表现出了较高的地球化学稳定性。关于石英的拉曼分析结果显示,矿石的石英存在507cm-1附近的峰位,而围岩样品均没有出现,这应该反映了二者结晶过程中具有不同的温度和压力等条件并导致石英结构存在差异,该拉曼位移的存在与否构成了成矿过程相关地质作用的判别标志。矿石与围岩中石英463cm-1附近拉曼位移的半高宽(FWHM)及拟合峰积分强度比对结果显示,矿石样品中石英结晶程度与有序度明显优于围岩样品中石英,这反映了成矿过程中热液活动对石英微观结构的改造。围岩中石英受后期热液影响大,部分成矿物质源于热液从围岩中带出,且成矿流体存在多期性,不同阶段矿物结晶程度不同,从而造成了特征拉曼位移FWHM值的不同。
[Abstract]:The complexity of geological process leads to the heterogeneity of macroscopic and microscopic characteristics of geological samples, which can be effectively revealed by spectroscopic analysis. Taking the samples of the Jinshan silver-gold deposit in the southern part of the Qinghang metallogenic belt as an example, The macroscopic geochemical characteristics based on X-ray fluorescence spectroscopy (XRF) and plasma mass spectrometry (ICP-MS) and the microregional characteristics based on Raman spectrum (Raman) have been analyzed. The results of macroscopic geochemical analysis show that the main element composition of ore and surrounding rock is quite different, but the distribution pattern of rare earth elements and trace elements are basically similar. This indicates that trace elements and rare earth elements show high geochemical stability during mineralization. The results of Raman analysis of quartz show that the quartz of the ore has a peak near 507cm-1, but the samples of surrounding rock do not appear. This should reflect the different conditions of temperature and pressure in the crystallization process and lead to the difference of quartz structure. The existence or not of the Raman shift constitutes the criterion of the geological process related to the metallogenic process. The results of (FWHM) and fitting peak intensity comparison of Raman shift near 463cm-1 of quartz in ore and surrounding rock show that the degree of crystal and order of quartz in ore sample is obviously better than that in sample of surrounding rock. This reflects the transformation of quartz microstructure by hydrothermal activity during mineralization. The quartz in the surrounding rock is greatly affected by the late hydrothermal solution, and some of the ore-forming materials originate from the hydrothermal fluid coming out from the surrounding rock, and the ore-forming fluid has multi-period property, and the mineral crystallization degree is different in different stages, which results in the difference of the characteristic Raman shift FWHM value.
【作者单位】：中山大学地球科学与地质工程学院/国家超级计算广州中心;广东省地质过程与矿产资源探查重点实验室;贵州财经大学资源与环境管理学院;
【基金】：国家重点研发项目(2016YFB1000302) 国家自然科学基金项目(41303025)资助
【分类号】：P624

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