谱学分析在造山带硅质岩中的应用及其地质意义

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英文篇名：Application of Analytical Techniques of Spectroscopy on Cherts in Orogenic Belt and Its Geological Significances 作者：陈铄 ; 苏志华 ; 周永章 ; 杨志军 ; 李红中 ; 周维丽 ; 张彦龙 英文作者：CHEN Shuo;SU Zhi-hua;ZHOU Yong-zhang;YANG Zhi-jun;LI Hong-zhong;ZHOU Wei-li;ZHANG Yan-long;School of Earth Science and Geological Engineering, Sun Yat-sen University;Guangdong Provincial Key Laboratory of Geological Processes and Mineral Resource Survey;Research Center for Earth Environment & Resources, Sun Yat-sen University;School of Resource & Environmental Management, Guizhou University of Finance and Economics; 关键词：秦岭造山带 ; 硅质岩 ; 微组构 ; 流体 ; 重结晶作用 英文关键词：Qinling orogenic belt;;Cherts;;Microfabric features;;Fluids;;Recrystallization 中文刊名：GUAN 英文刊名：Spectroscopy and Spectral Analysis 机构：中山大学地球科学与工程学院;广东省地质过程与矿产资源探查重点实验室;中山大学地球环境与地球资源研究中心;贵州财经大学资源与环境管理学院; 出版日期：2019-04-15 出版单位：光谱学与光谱分析 年：2019 期：v.39 基金：国家自然科学基金项目(41273040);; 高校基本科研业务费中山大学科研助手资助计划联合资助 语种：中文; 页：GUAN201904026 页数：8 CN：04 ISSN：11-2200/O4 分类号：138-145

摘要

南秦岭造山带旬阳盆地吕河地区发育有泥盆系硅质岩剖面,该剖面中的硅质岩以谱学特征为基础的微区特征清晰的记录了硅质岩的形成及后期演变信息。以南秦岭造山带旬阳盆地吕河硅质岩样品为对象,借助XRF、拉曼光谱、红外光谱和X射线粉晶衍射分析结果表明:该硅质岩内矿物主要为低温石英并包含极少量的碳酸盐矿物。XRD分析结果进一步证实该碳酸盐矿物为白云石。在吕河硅质岩内, SiO_2结构463 cm~(-1)附近拉曼特征峰经高斯拟合后的峰面积和FWHM值证实发生了低温石英的重结晶作用,该过程中伴随了流体作用引发的有序度变化和石英颗粒的自身有序度变化。在重结晶过程中,石英颗粒的自身重结晶伴随了有序度随时间推移而逐渐增高。流体作用对硅质岩的改造表现为硅质岩内碳酸盐脉体的穿插,该过程还导致低温石英有序度提升,其中越靠近矿物边缘处的SiO_2结构有序度越高。造山带演化过程对硅质岩进行的改造主要体现在两个方面:一方面,构造应力破坏了岩石的连续性并为后期热液流体的运移穿插提供了空间;另一方面,后期流体作用的参与促进了石英颗粒重结晶的进程。红外光谱可以系统的识别硅质岩内矿物的结构类型,拉曼光谱分析可以揭示原位(in situ)微组构特征, XRD在硅质岩内微量杂质矿物的识别优势明显,这些谱学手段为研究硅质岩的成岩演化提供了重要示范。
        The Devonian cherts profile was developed in Lvhe area, Xunyang basin of southern Qinling orogenic belt, and the microfabric features based on spectroscopy characteristics clearly recorded information of diagenesis and later stage evolution of the cherts. Cherts in Lvhe area, Xunyang basin of southern Qinling orogenic belt were taken as object, by means of Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray powder diffraction, and the results of this study showed that: low temperature quartz and a small quantity of carbonate minerals were the two main mineral phases of the cherts, and XRD analysis further proved the carbonate minerals were dolomites. Within the cherts in Lvhe area, Gauss fitting FWHM and Area values of the 463 cm~(-1) Raman shift of SiO_2 texture confirmed that recrystallization had occurred in the SiO_2 minerals. Alone with this process, variations of degree of order were triggered by fluid effects as well as the quartz itself. During the recrystallization process of the quartz, degree of order went up. The cherts were altered by later fluids, apart from the intersected late vein, the alteration reflected in that the closer to the edge of the fluids in the quartz, the higher the crystallinity and degree of order. In this study, alteration of cherts made by orogeny mainly reflected in two aspects: on the one hand, tectonic stress destroyed the continuity of the cherts and provides space for migration and intersection of later stage hydrothermal fluids; On the other hand, participation of the late fluids accelerated the recrystallization of quartz. In this study, infrared spectroscopy is capable of identifying mineral structure type systematically, and Raman spectrum analysis can reveal in situ microfabric characteristics, and XRD shows significant advantage in discriminating trace impurity minerals in cherts. These spectroscopy methods provide important demonstrations in studying the diagenetic evolution of the cherts.

引文

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