CN114965343A - Method for analyzing olivine components based on thermal infrared spectroscopy technology and application - Google Patents

Method for analyzing olivine components based on thermal infrared spectroscopy technology and application Download PDF

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CN114965343A
CN114965343A CN202210520365.1A CN202210520365A CN114965343A CN 114965343 A CN114965343 A CN 114965343A CN 202210520365 A CN202210520365 A CN 202210520365A CN 114965343 A CN114965343 A CN 114965343A
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olivine
thermal infrared
mass percentage
percentage content
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杨瀚文
李士杰
何海洋
王博
郝子琼
孙旭
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Xi'an Mineral Resources Survey Center Of China Geological Survey
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Abstract

本发明公开了一种基于热红外光谱技术对橄榄石成分进行分析的方法及应用,解决了利用现场取样结合实验室内电子探针技术对橄榄石成分进行分析时存在的操作复杂繁琐费时费力,以及应用成本高的问题。该方法的主要实现步骤是:1、从开源光谱数据库中提取多组橄榄石样本数据,分别获取橄榄石在热红外波段主吸收谷对应的波长值与橄榄石中FeO质量百分比含量、MgO质量百分比含量之间的线性关系;2、将两个线性关系分别输入至热红外波谱仪中;3、采用热红外波谱仪对待分析橄榄石样本进行检测,分别获取待分析橄榄石样本主吸收谷波长值对应的MgO和FeO质量百分比含量;4、计算出待分析橄榄石样本的Fe/Mg摩尔比。

Figure 202210520365

The invention discloses a method and application for analyzing olivine components based on thermal infrared spectroscopy technology, and solves the complicated, time-consuming and laborious operations that exist when the olivine components are analyzed by on-site sampling combined with the electronic probe technology in the laboratory. And the problem of high application cost. The main implementation steps of the method are: 1. Extract multiple sets of olivine sample data from the open source spectral database, and obtain the wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band, the FeO mass percentage content and the MgO mass percentage in the olivine respectively. The linear relationship between the contents; 2. Input the two linear relationships into the thermal infrared spectrometer respectively; 3. Use the thermal infrared spectrometer to detect the olivine sample to be analyzed, and obtain the wavelength value of the main absorption valley of the olivine sample to be analyzed. 4. Calculate the Fe/Mg molar ratio of the olivine sample to be analyzed.

Figure 202210520365

Description

基于热红外光谱技术对橄榄石成分进行分析的方法及应用Method and application of olivine composition analysis based on thermal infrared spectroscopy

技术领域technical field

本发明属于矿物化学成分鉴定技术领域,具体涉及一种基于热红外光谱技术对橄榄石成分进行分析的方法及应用。The invention belongs to the technical field of mineral chemical composition identification, in particular to a method and application for analyzing olivine composition based on thermal infrared spectroscopy technology.

背景技术Background technique

橄榄石,天然宝石,化学式为(Mgx,Fe2-x)SiO4,其母岩是地幔最主要的造岩矿物,是一种镁与铁的硅酸盐。其主要成分是铁、镁、硅,同时可含有锰、镍、钴等元素。晶体呈现粒状,在岩石中呈分散颗粒或粒状集合体。属于岛状硅酸盐。橄榄石可蚀变形成蛇纹石或菱镁矿,可以作为耐火材料。Olivine, a natural gemstone, has a chemical formula of (Mg x , Fe 2-x )SiO 4 . Its parent rock is the most important rock-forming mineral in the mantle, a silicate of magnesium and iron. Its main components are iron, magnesium, silicon, and can also contain elements such as manganese, nickel, and cobalt. The crystals are granular, and are dispersed particles or granular aggregates in rocks. Belongs to island silicate. Olivine can be altered to form serpentine or magnesite, which can be used as refractory materials.

橄榄石的组成,主要是由Mg2[SiO4]和Fe2[SiO4]两个端员组分形成的完全类质同象混晶体,有时还可含较多的Ca2+而成复盐CaMg[SiO4]-CaFe[SiO4]完全类质同象系列,与上述镁橄榄石-铁橄榄石完全类质同象系列间很少有类质同象发生。The composition of olivine is mainly composed of two end-member components Mg 2 [SiO 4 ] and Fe 2 [SiO 4 ]. It is a completely isomorphic mixed crystal, and sometimes it can also contain more Ca 2+ to form a complex crystal. The complete isomorphic series of salt CaMg[SiO 4 ]-CaFe[SiO 4 ] and the above-mentioned complete isomorphic series of forsterite-fayalite rarely have isomorphism.

长期以来,橄榄石作为地幔橄榄岩最主要的组成矿物和岩浆最早期结晶的矿物,一直是探究岩浆过程、地幔热状态及地幔端元组成等问题的主要研究对象,其微量元素含量可以提供关于地幔部分熔融和岩浆早期结晶过程、地幔交代作用的有效信息。For a long time, olivine, as the main constituent mineral of mantle peridotite and the earliest crystallized mineral of magma, has been the main research object for exploring magmatic process, mantle thermal state and mantle endmember composition. Effective information on partial melting of the mantle and early crystallization of magma, and mantle metasomatism.

当利用橄榄石进行地质研究时,传统做法是在待研究的地区进行橄榄石采样,并将橄榄石样本带回实验室,并将橄榄石样本研磨成粉末状,之后利用电子探针技术进行成分分析。When using olivine for geological research, the traditional practice is to sample the olivine in the area to be studied and bring the olivine sample back to the laboratory where the olivine sample is ground into powder and then compositionally determined using electron probe technology. analyze.

这种方法的弊端是:其一,实验操作过程复杂繁琐,费时费力;其二:电子探针技术的应用成本高。The disadvantages of this method are: firstly, the experimental operation process is complicated and time-consuming; secondly, the application cost of electronic probe technology is high.

发明内容SUMMARY OF THE INVENTION

为了解决利用现场取样结合实验室内电子探针技术对橄榄石成分进行分析时存在的操作复杂繁琐费时费力,以及应用成本高的问题。In order to solve the problems of complicated, time-consuming and laborious operation and high application cost when analyzing olivine components by on-site sampling combined with electronic probe technology in the laboratory.

本发明第一方面提供了一种基于热红外光谱技术对橄榄石成分进行分析的方法,该方法的实施步骤如下:A first aspect of the present invention provides a method for analyzing olivine components based on thermal infrared spectroscopy, and the implementation steps of the method are as follows:

步骤1:从开源光谱数据库中提取多组橄榄石样本数据,从多组橄榄石样本数据中获取橄榄石在热红外波段主吸收谷对应的波长值与橄榄石中FeO质量百分比含量之间的线性关系,同时在多组橄榄石样本数据中获取橄榄石在热红外波段主吸收谷对应的波长值与橄榄石中MgO质量百分比含量之间的线性关系;Step 1: Extract multiple sets of olivine sample data from the open source spectral database, and obtain the linearity between the wavelength value corresponding to the main absorption valley of olivine in the thermal infrared band and the mass percentage content of FeO in olivine from the multiple sets of olivine sample data At the same time, the linear relationship between the wavelength value corresponding to the main absorption valley of olivine in the thermal infrared band and the mass percentage content of MgO in olivine was obtained from multiple sets of olivine sample data;

步骤2:将橄榄石在主吸收谷对应的波长值与橄榄石中FeO质量百分比含量之间的线性关系,以及橄榄石在主吸收谷对应的波长值与橄榄石中MgO质量百分比含量之间的线性关系分别输入至热红外波谱仪中;Step 2: The linear relationship between the wavelength value corresponding to the main absorption valley of olivine and the mass percentage content of FeO in olivine, and the wavelength value corresponding to the main absorption valley of olivine and the mass percentage content of MgO in olivine The linear relationship is respectively input into the thermal infrared spectrometer;

步骤3:采用步骤2的热红外波谱仪对待分析橄榄石样本进行检测,分别获取待分析橄榄石样本主吸收谷波长值在10-11μm内待分析橄榄石样本中MgO和FeO质量百分比含量;Step 3: use the thermal infrared spectrometer of step 2 to detect the olivine sample to be analyzed, and obtain the mass percentage content of MgO and FeO in the olivine sample to be analyzed that the wavelength value of the main absorption valley of the olivine sample to be analyzed is within 10-11 μm;

步骤4:热红外波谱仪利用步骤3获取的待分析橄榄石样本中MgO和FeO质量百分比含量,计算出待分析橄榄石样本的Fe/Mg摩尔比。Step 4: The thermal infrared spectrometer uses the mass percentage content of MgO and FeO in the olivine sample to be analyzed obtained in step 3 to calculate the Fe/Mg molar ratio of the olivine sample to be analyzed.

本发明通过存储有橄榄石在主吸收谷对应的波长值与橄榄石中FeO、MgO质量百分比含量之间的线性关系,可实时计算出待分析橄榄石样本的Fe/Mg摩尔比,从而快速的实现了对橄榄石成分分析,与现有的检测方法相比检测效率大幅提升,并且也不会对样本本身造成损坏。By storing the linear relationship between the wavelength value corresponding to the olivine in the main absorption valley and the mass percentage content of FeO and MgO in the olivine, the present invention can calculate the Fe/Mg molar ratio of the olivine sample to be analyzed in real time, thereby rapidly Compared with the existing detection methods, the analysis of olivine components is realized, and the detection efficiency is greatly improved, and the sample itself will not be damaged.

具体地,上述步骤1中橄榄石在热红外波段主吸收谷对应的波长值与橄榄石中FeO质量百分比含量之间的线性关系为:Specifically, in the above step 1, the linear relationship between the wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band and the FeO mass percentage content in the olivine is:

wtFeO=120.5512*λ-1232.0665;wt FeO = 120.5512*λ-1232.0665;

其中,wtFeO为FeO的质量百分比含量,λ为橄榄石在热红外波段主吸收谷对应的波长值,单位为微米。Among them, wt FeO is the mass percentage content of FeO, λ is the wavelength value corresponding to the main absorption valley of olivine in the thermal infrared band, and the unit is micrometer.

具体地,上述步骤1中所述步骤1中橄榄石在热红外波段主吸收谷对应的波长值与橄榄石中MgO质量百分比含量之间的线性关系为:Specifically, in the step 1 described in the above step 1, the linear relationship between the wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band and the MgO mass percentage content in the olivine is:

wtMgO=-101.1970*λ+1091.9951; wtMgO =-101.1970*λ+1091.9951;

其中,wtFeO为MgO的质量百分比含量,λ为橄榄石在热红外波段主吸收谷对应的波长值,单位为微米。Among them, wt FeO is the mass percentage content of MgO, λ is the wavelength value corresponding to the main absorption valley of olivine in the thermal infrared band, and the unit is micrometer.

具体地,上述步骤4中橄榄石样本的Fe/Mg摩尔比的具体计算公式为:mol(Fe/Mg)=wtFeO/wtMgO*40.3044/71.8444;Specifically, the specific calculation formula of the Fe/Mg molar ratio of the olivine sample in the above step 4 is: mol(Fe/Mg)=wt FeO /wt MgO *40.3044/71.8444;

其中,40.3044为MgO分子量,71.8444为FeO分子量。Among them, 40.3044 is the molecular weight of MgO, and 71.8444 is the molecular weight of FeO.

具体地,上述步骤1中从多组橄榄石样本数据中获取橄榄石在热红外波段主吸收谷对应的波长值与橄榄石中FeO质量百分比含量之间的线性关系的具体过程为:Specifically, the specific process of obtaining the linear relationship between the wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band and the FeO mass percentage content in the olivine from the multiple groups of olivine sample data in the above step 1 is:

步骤S1:在开源光谱数据库中筛选出同时具有热红外光谱数据和矿物电子探针分析数据的多个橄榄石样本数据;Step S1: screen out a plurality of olivine sample data with both thermal infrared spectral data and mineral electron probe analysis data in the open source spectral database;

步骤S2:在多个橄榄石样本数据分别对应的热红外光谱数据中提取热红外波段主吸收谷对应的波长值;Step S2: extracting the wavelength value corresponding to the main absorption valley of the thermal infrared band from the thermal infrared spectral data corresponding to the multiple olivine sample data respectively;

步骤S3:在多个橄榄石样本数据分别对应的矿物电子探针分析数据中提取橄榄石样本中FeO质量百分比含量;Step S3: extracting the FeO mass percentage content in the olivine sample from the mineral electron probe analysis data corresponding to the data of the multiple olivine samples respectively;

步骤S4:对步骤S2和步骤S3中提取的波长值和质量百分比含量进行线性回归拟合,得到波长值和质量百分比含量之间的线性关系。Step S4: Perform linear regression fitting on the wavelength value and the mass percentage content extracted in steps S2 and S3 to obtain a linear relationship between the wavelength value and the mass percentage content.

具体地,上述步骤1中从多组橄榄石样本数据中获取橄榄石在热红外波段主吸收谷对应的波长值与橄榄石中MgO质量百分比含量之间的线性关系的具体过程为:Specifically, the specific process of obtaining the linear relationship between the wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band and the MgO mass percentage content in the olivine from the multiple groups of olivine sample data in the above step 1 is:

步骤S1:在开源光谱数据库中筛选出同时具有热红外光谱数据和矿物电子探针分析数据的多个橄榄石样本数据;Step S1: screen out a plurality of olivine sample data with both thermal infrared spectral data and mineral electron probe analysis data in the open source spectral database;

步骤S2:在多个橄榄石样本数据分别对应的热红外光谱数据中提取热红外波段主吸收谷对应的波长值;Step S2: extracting the wavelength value corresponding to the main absorption valley of the thermal infrared band from the thermal infrared spectral data corresponding to the multiple olivine sample data respectively;

步骤S3:在多个橄榄石样本数据分别对应的矿物电子探针分析数据中提取橄榄石样本中MgO质量百分比含量;Step S3: extracting the MgO mass percentage content in the olivine sample from the mineral electron probe analysis data corresponding to the data of the multiple olivine samples respectively;

步骤S4:对步骤S2和步骤S3中提取的波长值和质量百分比含量进行线性回归拟合,得到波长值和质量百分比含量之间的线性关系。Step S4: Perform linear regression fitting on the wavelength value and the mass percentage content extracted in steps S2 and S3 to obtain a linear relationship between the wavelength value and the mass percentage content.

具体地,上述述开源光谱数据库为NASAECOSTRESS波谱库或者USGS波谱库。Specifically, the above-mentioned open source spectral database is the NASAECOSTRESS spectral library or the USGS spectral library.

具体地,上述述步骤3中所述热红外波谱仪的光谱范围包含8-12μm,波谱分辨率优于25nm。Specifically, the spectral range of the thermal infrared spectrometer in the above-mentioned step 3 includes 8-12 μm, and the spectral resolution is better than 25 nm.

本发明第二方面提供了一种采用上述橄榄石成分进行分析的方法在地质研究方面的应用。The second aspect of the present invention provides an application of the method for analyzing the above olivine components in geological research.

本发明第二方面提供了一种采用上述橄榄石成分进行分析的方法在珠宝鉴定方面的应用。The second aspect of the present invention provides an application of the method for analyzing the above-mentioned olivine components in jewelry identification.

本发明的有益效果为:The beneficial effects of the present invention are:

1、本发明巧妙地利用了橄榄石在10-11μm间的主吸收谷对应的波长值与橄榄石中MgO和FeO质量百分比含量之间的线性关系,在此基础上提出了利用热红外光谱测量技术对橄榄石的Fe/Mg比进行测量,与传统现场取样结合实验室内电子探针技术的方法相比,本发明的方法可在地质现场短时间内快速、准确、经济地确定橄榄石Fe/Mg摩尔比,对于地质研究,地球化学示踪、以及珠宝鉴定等方面均具有积极应用价值。1. The present invention skillfully utilizes the linear relationship between the wavelength value corresponding to the main absorption valley of olivine between 10-11 μm and the mass percentage content of MgO and FeO in olivine. The Fe/Mg ratio of olivine is measured by the technology, and compared with the method of traditional field sampling combined with the electronic probe technology in the laboratory, the method of the present invention can quickly, accurately and economically determine Fe of olivine in a short time on the geological site. The molar ratio of /Mg has positive application value for geological research, geochemical tracing, and jewelry identification.

2、本发明巧妙利用热红外光谱测量技术对橄榄石的Fe/Mg比进行测量,无需从橄榄石上取样并研磨成粉末后进行珠宝鉴定,避免了对珠宝不必要的浪费。2. The present invention skillfully utilizes thermal infrared spectrum measurement technology to measure the Fe/Mg ratio of olivine, and does not need to sample the olivine and grind it into powder for jewelry identification, thereby avoiding unnecessary waste of jewelry.

附图说明Description of drawings

图1为实施例中所用USGS波谱库15条橄榄石热红外波谱。Figure 1 shows 15 olivine thermal infrared spectra of the USGS spectral library used in the examples.

图2为实施例中所用NASAECOSTRESS波谱库15条橄榄石热红外波谱图。Fig. 2 is the 15 olivine thermal infrared spectrograms of the NASAECOSTRESS spectral library used in the embodiment.

图3为实施例中MgO含量与橄榄石10-11um区间主吸收谷波长线性关系。3 is a linear relationship between the MgO content and the wavelength of the main absorption valley in the 10-11um interval of olivine in the embodiment.

图4为实施例中FeO含量与橄榄石10-11um区间主吸收谷波长线性关系。Figure 4 is a linear relationship between FeO content and the wavelength of the main absorption valley in the olivine 10-11um interval in the embodiment.

具体实施方式Detailed ways

现在将参照附图来详细描述本发明的各种示例性实施例。应注意到:除非另外具体说明,否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise.

以下对至少一个示例性实施例的描述实际上仅仅是说明性的,决不作为对本发明及其应用或使用的任何限制。The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论,但在适当情况下,所述技术、方法和设备应当被视为说明书的一部分。Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

在这里示出和讨论的所有例子中,任何具体值应被解释为仅仅是示例性的,而不是作为限制。因此,示例性实施例的其它例子可以具有不同的值。In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other instances of the exemplary embodiment may have different values.

橄榄石作为主要的造岩矿物,在地质学中有广泛应用。在工业上,由于其拥有较高的熔点,富镁的橄榄石可用作耐火材料。大颗粒、高净度的橄榄石可作为宝石材料。As the main rock-forming mineral, olivine is widely used in geology. In industry, magnesium-rich olivine can be used as a refractory due to its high melting point. Large-grained, high-clarity peridot can be used as a gemstone material.

橄榄石在高压条件下可发生相变,形成似尖晶石结构的瓦兹利石(β-橄榄石)和尖晶石结构的林伍德石(γ-橄榄石),这两种矿物可作为超高压变质作用的指示矿物。对橄榄石的相变过程的研究对于认识地幔不连续面的成因,整个地幔的物质组成和演化、地幔对流、俯冲板片深源地震等地球深部动力学问题具有重要意义。同时,作为地幔岩捕掳体,对橄榄石的研究也是了解地幔物质组成的一个主要途径。而作为石陨石的主要组成矿物之一,研究橄榄石的特征,对宇宙中其他星球上类似地幔物质的起源也有指示作用。Olivine can undergo phase transformation under high pressure conditions to form wadsleyite (β-olivine) with a spinel-like structure and Ringwoodite (γ-olivine) with a spinel structure, which can be used as Indicator minerals for UHP metamorphism. The study of the phase transition process of olivine is of great significance for understanding the origin of the mantle discontinuity, the material composition and evolution of the entire mantle, mantle convection, and deep earthquakes in the subducting slab. At the same time, as a mantle rock capture body, the study of olivine is also a major way to understand the composition of mantle materials. As one of the main constituent minerals of stony meteorites, studying the characteristics of olivine can also indicate the origin of similar mantle materials on other planets in the universe.

本实施例提供了一种基于热红外光谱技术对橄榄石成分进行分析的方法,其主要实施流程如下:The present embodiment provides a method for analyzing olivine components based on thermal infrared spectroscopy, and its main implementation process is as follows:

1、选取一台光谱范围在8-12μm,波谱分辨率优于25nm的热红外波谱仪;1. Select a thermal infrared spectrometer with a spectral range of 8-12μm and a spectral resolution better than 25nm;

2、获取橄榄石在热红外波段主吸收谷对应的波长值与橄榄石中MgO质量百分比含量之间的线性关系,以及橄榄石在主吸收谷对应的波长值与橄榄石中FeO质量百分比含量之间的线性关系;2. Obtain the linear relationship between the wavelength value corresponding to the main absorption valley of olivine in the thermal infrared band and the mass percentage content of MgO in olivine, and the wavelength value corresponding to the main absorption valley of olivine and the mass percentage content of FeO in olivine. the linear relationship between;

为了确保获取的线性关系数据的可靠性和准确性,本实施例采用了两种开源光谱数据库,分别为:USGS波谱库和NASA的ECOSTRESSspectrallibrary波谱库;之所以选取主吸收谷获得线性关系的原因在:以上两种波谱库提供的是反射率测量数据,波峰易受光线等外部因素影响,并不是矿物的稳定鉴定特征,而选用波谱的谷形特征才能较好的反应出矿物的本征吸收特性;In order to ensure the reliability and accuracy of the obtained linear relationship data, two open source spectral databases are used in this embodiment, namely: USGS spectral library and NASA's ECOSTRESSspectrallibrary spectral library; the reason for selecting the main absorption valley to obtain the linear relationship is that : The above two spectral libraries provide reflectance measurement data. The peaks are easily affected by external factors such as light, and are not the stable identification features of minerals. The valley-shaped features of the spectrum can better reflect the intrinsic absorption characteristics of minerals. ;

具体获得线性关系的过程如下:The specific process of obtaining a linear relationship is as follows:

从USGS波谱库中筛选出由Nicolet测量光谱且附有电子探针分析数据的橄榄石矿物样本,共计15个,分别读取其在10-11μm光谱区间主吸收谷波长λ(图1)及其MgO、FeO质量百分比含量(表1);A total of 15 olivine mineral samples with spectra measured by Nicolet and electron probe analysis data were screened from the USGS spectral library, and their main absorption valley wavelengths λ in the spectral range of 10-11 μm were read (Fig. 1) and MgO, FeO mass percentage content (Table 1);

从NASA的ECOSTRESSspectrallibrary波谱库中筛选出测量类型为“Bidirectionalreflectance”且附有电子探针分析数据的橄榄石矿物样本,共计15个,分别读取其在10-11μm光谱区间主吸收谷波长λ(图2)及其MgO、FeO重量百分比含量(表2)。From NASA's ECOSTRESSspectrallibrary spectral library, a total of 15 olivine mineral samples with measurement type "Bidirectionalreflectance" and electron probe analysis data were screened, and their main absorption valley wavelengths λ in the 10-11μm spectral range were read (Fig. 2) and its MgO, FeO weight percentage content (Table 2).

表1Table 1

Figure BDA0003643101650000051
Figure BDA0003643101650000051

表2Table 2

Figure BDA0003643101650000052
Figure BDA0003643101650000052

Figure BDA0003643101650000061
Figure BDA0003643101650000061

将上表中FeO含量、MgO含量分别与主吸收谷波长做回归运算(通常采用最小二乘法),可得到橄榄石MgO、FeO含量与10-11um区间主吸收谷波长的强显著线性关系,具体参见图3和图4;Regressing the FeO content and MgO content in the above table with the wavelength of the main absorption valley respectively (usually using the least squares method), the strong and significant linear relationship between the content of olivine MgO and FeO and the wavelength of the main absorption valley in the 10-11um interval can be obtained. See Figures 3 and 4;

wtMgO=-101.1970*λ+1091.9951;(1)wt MgO = -101.1970*λ+1091.9951; (1)

其中,wtFeO为MgO的质量百分比含量,λ为橄榄石在热红外波段主吸收谷对应的波长值,单位为微米;Among them, wt FeO is the mass percentage content of MgO, λ is the wavelength value corresponding to the main absorption valley of olivine in the thermal infrared band, and the unit is micron;

wtFeO=120.5512*λ-1232.0665;(2)wt FeO = 120.5512*λ-1232.0665; (2)

其中,wtFeO为FeO的质量百分比含量,λ为橄榄石在热红外波段主吸收谷对应的波长值,单位为微米;Among them, wt FeO is the mass percentage content of FeO, λ is the wavelength value corresponding to the main absorption valley of olivine in the thermal infrared band, and the unit is micron;

3、将以上获取的线性关系公式(1)和(2)输入至提前准备的热红外波谱仪中,使用热红外波谱仪采集待分析橄榄石样本的热红外波谱,并提取其10-11um区间主吸收谷波长,利用线性关系公式(1)和(2),计算出待分析橄榄石样本的FeO、MgO质量百分比含量;4、利用获取的待分析橄榄石样本中FeO、MgO的质量百分比含量,计算出待分析橄榄石样本的Fe/Mg摩尔比;3. Input the linear relationship formulas (1) and (2) obtained above into the thermal infrared spectrometer prepared in advance, use the thermal infrared spectrometer to collect the thermal infrared spectrum of the olivine sample to be analyzed, and extract its 10-11um range The wavelength of the main absorption valley, using the linear relationship formulas (1) and (2), to calculate the mass percentage content of FeO and MgO in the olivine sample to be analyzed; 4. Using the obtained mass percentage content of FeO and MgO in the olivine sample to be analyzed , calculate the Fe/Mg molar ratio of the olivine sample to be analyzed;

5、由于橄榄石的化学式为(Mgx,Fe2-x)SiO4,其中X是待定的,所以当获得了待分析橄榄石样本的Fe/Mg摩尔比,也就等于得到了待分析橄榄石样本的化学成分。5. Since the chemical formula of olivine is (Mg x , Fe 2-x )SiO 4 , where X is to be determined, when the Fe/Mg molar ratio of the olivine sample to be analyzed is obtained, it is equivalent to the obtained olivine to be analyzed. Chemical composition of stone samples.

将以上分析方法应用于地质勘探时,可采用一台便捷式热红外波谱仪,在勘探现场即可获得快速获得多个不同区域橄榄石的成分,无需将现场橄榄石带回实验室进行,大大提升了效率。When the above analysis methods are applied to geological exploration, a portable thermal infrared spectrometer can be used to quickly obtain the composition of olivine in multiple different areas at the exploration site, without the need to bring the site olivine back to the laboratory. Efficiency is improved.

将以上分析方法应用于珠宝鉴定时,只需利用热红外波谱仪对橄榄石进行检测即可获得该橄榄石的成分,相较现有方法除了检测效率高之外,也无需对橄榄石本身造成破坏。When the above analysis method is applied to jewelry identification, the composition of the olivine can be obtained only by using the thermal infrared spectrometer to detect the olivine. Compared with the existing method, in addition to the high detection efficiency, it does not need to cause any damage to the olivine itself. destroy.

Claims (10)

1. A method for analyzing the components of olivine based on thermal infrared spectroscopy is characterized by comprising the following steps:
step 1: extracting a plurality of groups of olivine sample data from the open-source spectrum database, acquiring a linear relation between a wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band and the mass percentage content of FeO in the olivine from the plurality of groups of olivine sample data, and acquiring a linear relation between a wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band and the mass percentage content of MgO in the olivine from the plurality of groups of olivine sample data;
step 2: respectively inputting the linear relation between the wavelength value corresponding to the olivine in the main absorption valley and the mass percentage content of FeO in the olivine, and the linear relation between the wavelength value corresponding to the olivine in the main absorption valley and the mass percentage content of MgO in the olivine into a thermal infrared spectrometer;
and step 3: detecting the olivine sample to be analyzed by adopting the thermal infrared spectrometer in the step 2, and respectively obtaining the mass percentage contents of MgO and FeO in the olivine sample to be analyzed, wherein the main absorption valley wavelength value of the olivine sample to be analyzed is within 10-11 mu m;
and 4, step 4: and 3, calculating the Fe/Mg molar ratio of the olivine sample to be analyzed according to the mass percentage content of MgO and FeO in the olivine sample to be analyzed, which is obtained in the step 3.
2. The method for the analysis of olivine components according to claim 1, based on thermal infrared spectroscopy, characterized in that: in the step 1, the linear relation between the corresponding wavelength value of the olivine in the main absorption valley of the thermal infrared band and the FeO content in the olivine by mass percentage is as follows:
wtFeO=120.5512*λ-1232.0665;
wherein wtFeO is the mass percentage content of FeO, and lambda is the wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band, and the unit is micrometer.
3. The method for the analysis of olivine components according to claim 2, characterized in that it comprises: in the step 1, the linear relation between the corresponding wavelength value of the main absorption valley of the olivine in the thermal infrared band in the step 1 and the MgO mass percentage content in the olivine is as follows:
wtMgO=-101.1970*λ+1091.9951;
wherein wtFeO is the mass percentage content of MgO, and lambda is the wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band, and the unit is micrometer.
4. A method for the analysis of olivine constituents based on thermal infrared spectroscopy techniques according to claim 3, characterized in that: the specific calculation formula of the Fe/Mg molar ratio of the olivine sample in the step 4 is as follows:
mol(Fe/Mg)=wtFeO/wtMgO*40.3044/71.8444;
wherein 40.3044 is the MgO molecular weight and 71.8444 is the FeO molecular weight.
5. A method for the analysis of the olivine composition according to any of claims 1 to 4, based on thermal infrared spectroscopy, characterized in that: the specific process of acquiring the linear relation between the wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band and the mass percentage content of FeO in the olivine from the multiple sets of olivine sample data in the step 1 is as follows:
step S1: screening a plurality of olivine sample data which simultaneously have thermal infrared spectrum data and mineral electronic probe analysis data from an open source spectrum database;
step S2: extracting wavelength values corresponding to main absorption valleys of thermal infrared bands from thermal infrared spectrum data respectively corresponding to a plurality of olivine sample data;
step S3: extracting the mass percentage content of FeO in the olivine sample from the mineral electronic probe analysis data respectively corresponding to the plurality of olivine sample data;
step S4: linear regression fitting is performed on the wavelength value and the mass percentage content extracted in step S2 and step S3 to obtain a linear relationship between the wavelength value and the mass percentage content.
6. A method for the analysis of the olivine composition according to any of claims 1 to 4, based on thermal infrared spectroscopy, characterized in that:
the specific process of acquiring the linear relation between the wavelength value corresponding to the main absorption valley of the olivine in the thermal infrared band and the MgO mass percentage content in the olivine from the multiple sets of olivine sample data in the step 1 is as follows:
step S1: screening a plurality of olivine sample data which simultaneously have thermal infrared spectrum data and mineral electronic probe analysis data in an open source spectrum database;
step S2: extracting wavelength values corresponding to main absorption valleys of thermal infrared bands from thermal infrared spectrum data respectively corresponding to a plurality of olivine sample data;
step S3: extracting the MgO mass percentage content in the olivine sample from the mineral electronic probe analysis data respectively corresponding to the plurality of olivine sample data;
step S4: linear regression fitting is performed on the wavelength value and the mass percentage content extracted in step S2 and step S3 to obtain a linear relationship between the wavelength value and the mass percentage content.
7. The method for the analysis of olivine constituents based on thermal infrared spectroscopy according to claim 1, wherein: the open source spectrum database is a NASAECOSTRES spectrum database or a USGS spectrum database.
8. The method for the analysis of olivine components according to claim 1, based on thermal infrared spectroscopy, characterized in that: the spectral range of the thermal infrared spectrometer in the step 3 comprises 8-12 μm, and the spectral resolution is better than 25 nm.
9. Use of the method for the analysis of olivine components according to claim 1 based on thermal infrared spectroscopy for geological research.
10. Use of the method for the analysis of olivine components according to claim 1 based on thermal infrared spectroscopy for the identification of jewelry.
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