白色-浅灰色高山石与昌化石产地鉴别谱学初探

doi:10.3964/j.issn.1000-0593(2019)09-2746-05

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Abstract China has a long history enjoying in the Seal Stones. Both Shoushan Stone and Changhua Stone are famous Seal Stones in China. But their prices are different. Gaoshan Stone is a main variety of Shoushan Stones, which has high market share. In order to preliminarily study the origin identification of Seal Stone, this paper chooses white-light gray Gaoshan Stone and Changhua Stone as study objects that can avoid disturbance of color minerals and color elements to the identification of origin. Infrared spectrum (FTIR), Raman spectrum (LRM) and laser ablation-plasma mass spectrum (LA-ICP-MS) were used to study mineral compositions and trace chemical compositions of white-light gray Gaoshan Stone and Changhua Stone. Combined with physical properties of them, differences and identification methods have been discussed in the two origins. The color of white-light gray Gaoshan Stone is more uniform than that of Changhua Stone. The transparency of Gaoshan Stone is better. They have similar density and refractive index. According to the absorbance peaks of IR in the fingerprint area, the main mineral compositions of white-light gray Gaoshan Stone and Changhua Stone are kaolin-group minerals. Because the different occupied site of hydroxyl in kaolin-group minerals, the forms and amounts of absorbance peaks of stretching vibration of hydroxyl are different. According to the results of the forms and amounts of absorbance peaks of functional area in IR spectrum, the main mineral composition of Gaoshan Stone is ordered dickite, but Changhua Stone has disordered dickite. However, both of them can contain a minor amount of kaolinite. Raman spectrum was used to study impurity minerals on the site of pricker- and soft-spot areas. It is found that Gaoshan Stone has simple impurity minerals. The dark pricker-spot is pyrite, and the soft-spot is quartz. However, Changhua stone has relative complex impurity minerals, such as hematite, rutile, anatase, quartz and barite. Comparing the LA-ICP-MS data of dickite, we found that Gaoshan Stone contains relative high Ge element, while Changhua Stone contains relative higher V and Zn. According to the value of Ge/Zn, which is larger than 0.2 for Gaoshan Stone, but is smaller than 0.2 for Changhua Stone. And according to the value of Ge/V, which is smaller than 0.1 for most of Changhua stone, but which is between 0~1.0 for Gaoshan Stone. The distributions of splashes of Ge/V-Ge/Zn values of the two origins are different. The distinction degree can be larger than 90%. Color, density and refractive index are similar for white-light gray Gaoshan Stone and Changhua Stone. It is difficult to distinguish them only by the appearance characters and physical properties. However, their varieties and contents are different. The test and analysis can be used to identify their origins. On the other hand, they are different in the amount of trace elements, which also can be used to identify the origin by Ge/V-Ge/Zn scatter diagram.

Key words：Gaoshan Stone; Changhua Stone; Origin identification; Infrared spectrum; Raman spectrum; Laser ablation-plasma mass spectrum

Received: 2018-08-25 Accepted: 2019-01-12

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P578.964

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2019)09-2746-05 OR https://www.gpxygpfx.com/EN/Y2019/V39/I09/2746