基于多種光譜學分析技術(shù)的地質(zhì)樣品宏微觀組構(gòu)特征研究——以欽杭成礦帶南段金山銀金礦床巖石樣品為例
[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.
【作者單位】: 中山大學地球科學與地質(zhì)工程學院/國家超級計算廣州中心;廣東省地質(zhì)過程與礦產(chǎn)資源探查重點實驗室;貴州財經(jīng)大學資源與環(huán)境管理學院;
【基金】:國家重點研發(fā)項目(2016YFB1000302) 國家自然科學基金項目(41303025)資助
【分類號】:P624
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