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Method for quantitatively discriminating nephrite production areas

A technology of origin and nephrite, applied in measurement devices, material excitation analysis, fluorescence/phosphorescence, etc., can solve problems such as research reports

Inactive Publication Date: 2015-12-23
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the LDA method has been used to identify the geological sources of certain single crystal gemstones, such as copper-bearing Paraiba tourmaline, ruby, sapphire, etc. research report

Method used

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  • Method for quantitatively discriminating nephrite production areas
  • Method for quantitatively discriminating nephrite production areas
  • Method for quantitatively discriminating nephrite production areas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0076] Embodiment 1 Binary iterative linear discriminant analysis (IB-LDA) method and distinguishing result

[0077] 1) The samples in the examples are a large number of nephrite samples collected on-the-spot by the research team of the inventor who went to various mining areas of marble-type nephrite in East Asia for many years. Taking the eight most common nephrite jade origins as the research objects, the origin discrimination model was established by using the IB-LDA method. The geographic location of the 8 origins is as follows: figure 2 shown. figure 2 The nephrite produced in the central Xinjiang area is divided into Xinjiang West and Xinjiang East, which is determined based on the significant differences in geological and metallogenic conditions between the two (Tang Yanling et al., 1994). Numbers 1-8 represent Xinjiang West (the ore sites in western Xinjiang, China, including the famous Hotan, Yecheng, and Moyu River areas, etc.), Xinjiang East (the ore sites in e...

Embodiment 2

[0099] The test of embodiment 2 unknown place of origin sample

[0100]In this example, the "sample to be tested" of unknown origin is tested, and the origin discriminant analysis is carried out on two nephrite samples that are said to come from the Xinjiang region (the origin of which has not been determined). As in step 2) of Example 1, first select a smooth and flat area of ​​the sample surface for LA-ICP-MS testing, test 3 points for each sample, and obtain 6 test points in total. The trace element content is brought into Step 4 of Example 1 in turn. IB-LDA is based on the classification function established by 8 production areas, which group has a higher score in the classification function, and which production area the "test sample" belongs to.

[0101] The result of the discrimination is that after 7 rounds of IB-LDA analysis, the classification function scores of these 6 test points all fall within the range of East Xinjiang. or7 Both are 89.6%.

Embodiment 3

[0102] Embodiment 3 traditional linear discriminant analysis (LDA) method producing area distinguishing result

[0103] This example is used to compare the distinguishing effect of traditional LDA and IB-LDA. In traditional LDA analysis, the samples and trace element contents used are the same as in Example 1, that is, statistical linear discriminant analysis is carried out on 480 sample test points from 8 production areas. The difference from IB-LDA is that traditional LDA regards samples from each origin as a group and conducts multiple comparisons at the same time. The discriminant result is the result of a round of discriminant analysis of 8 origins, and the discrimination probability of all origins is the same, while IB-LDA can give the maximum discriminant probability of each origin relative to other origins.

[0104] The specific analysis steps of traditional LDA are as follows:

[0105] Step 1: Each of the 8 production areas is regarded as an independent group, and t...

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Abstract

The invention provides a method for quantitatively discriminating nephrite production areas. The method includes the steps that firstly, nephrite samples of known production areas are prepared; secondly, the content of microelements of the samples is quantitatively tested, and test points are divided into a training group and a testing group; thirdly, the content of the microelements is subjected to significance level analysis to detect whether statistic differences exist between different production areas; fourthly, by means of the binary iteration linear discriminant analysis (IB-LDA) method, data of the training group are discriminated two by two, and feasibility of the method is tested through the testing group; fifthly, the production areas of the samples to be tested are predicted through the IB-LDA method. The method quantitatively discriminates the nephrite production areas on the basis of binary iteration linear discriminant analysis of the microelements, the mode that multiple traditional groups are compared at the same time is simplified into the mode that the groups are compared two by two, and the discrimination probability of each production area relative to other production area is obtained. Besides, the discrimination ability of a discrimination function is remarkably improved. Compared with the naked eye qualitative discrimination method and a traditional linear discriminant analysis method, the method has obvious advantages.

Description

technical field [0001] The invention belongs to the field of identification of origin, and in particular relates to a method for quantitatively identifying the origin of nephrite jade through quantitative measurement and statistical binary iterative linear discriminant analysis for the content of trace elements in a sample. Background technique [0002] East Asian countries, especially China, have always had a strong interest and love for nephrite since ancient times. The history of Chinese using nephrite can be traced back to the Neolithic Age (Wen and Jing, 1996; Tsienet et al., 1996; Wen, 2001; Harlow and Sorensen, 2005). In ancient times, nephrite was regarded as a symbol of the power and wealth of emperors and nobles. Represents the good character of a gentleman. Today, nephrite ornaments from China, Russia, South Korea and other places are still very popular in the Chinese jade market, and have become the key objects of scientific research on gemstones. Among them, t...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01N21/63G01N21/64G01N27/62G01N27/68G01N27/626
CPCG01N27/68G01N33/00G01N21/63G01N21/64G01N27/623
Inventor 罗泽敏沈锡田杨明星
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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