投稿时间：2018-11-21
修订日期：2019-10-20
网络发布日期：2020-02-26
中文摘要:拉曼光谱是一种快速无损的分析手段，它既可观察样品的显微结构构造，也可分析样品的成分和结构。为了丰富多金属结核的岩石矿物学特征，文章对西太平洋某海山区的多金属结核样品进行了X射线粉末衍射分析和拉曼光谱分析。X射线分析结果显示该区域样品主要含有水羟锰矿、钡镁锰矿、斜长石、钙十字沸石和石英，显微构造主要有纹层状构造、柱状构造、树枝状构造、充填构造等。通过分析对比潮湿样品和烘干样品铁锰质矿物的拉曼特征谱峰，得出结核中水羟锰矿的特征谱峰位于490 cm-1、570 cm-1和626 cm-1附近，钡镁锰矿的特征谱峰则位于640 cm-1附近，与陆地上对应矿物的特征拉曼谱峰不同。结核中的钡镁锰矿结构不稳定，经过风干或者抛磨后部分产生相变，不同显微结构中，相变情况不同。经与RRUFF数据库比对，识别出钙十字沸石、斜长石等自形晶，多分布于结核最内层，往结核外层总体减少。矿物微晶多见铁锰质矿物微晶和钙十字沸石微晶，铁锰质矿物绕其向外生长。
Abstract:Raman spectroscopy is a fast and non-destructive analytical method. It can observe the microstructure of the sample as well as the mineral composition and structure of the mineral. In order to enrich the mineralogical characteristics of polymetallic nodules, the authors analyzed the nodule samples by X-ray powder diffraction and Raman spectroscopy in a seamount of the Western Pacific Ocean. The polymetallic nodules mainly contain vernadite, todorokite, anorthite, phillipsite and quartz. Their microstructures include laminar structure, columnar structure, dendroid structure, fill structure, etc. A comparison of the Raman characteristics peaks of the ferromanganese minerals in the wet samples and in the dried samples shows that the characteristic peaks of vernadite appear at nearly 490 cm-1, 570 cm-1 and 626 cm-1. Raman peaks of todorokite appear at nearly 640 cm-1. It is different from the Raman peaks of the vernadite and todorokite from land. The structure of todorokite is unstable, phase transformation occurs after air drying or polishing. The degree of phase transformation is different in different microstructures. Based on a comparison with the RRUFF database, the authors identified euhedral crystals such as phillipsite and anorthite, which are mostly distributed in the innermost layer and decrease in quantity in the outer layer. The crystallites are mainly ferromanganese minerals and phillipsite. The ferromanganese minerals often grow around the crystallites.
文章编号：
中图分类号：
文献标志码：
基金项目:本文得到国际海域资源调查与开发“十三五”课题（编号：DY135-R2-1-05）、南方海洋科学与工程广东省实验室（广州）人才团队引进重大专项（编号：GML2019ZD0106）和中国地质调查局项目（编号：DD20191009）资助
引用文本：
赖佩欣,任江波,邓剑锋.2020.大洋多金属结核中铁锰质矿物拉曼光谱特征初探[J].矿床地质,39(1):126~134LAI PeiXin,REN JiangBo,DENG JianFeng.2020.A preliminary study of Raman spectroscopy of ferromanganese minerals in oceanic polymetallic nodules[J].Mineral Deposits39(1):126~134
图/表
