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| Study on Spectroscopy and Locality Characteristics of the Tremolite Jade in Hanyaozi Grassland |
| YU Xuan1, LIU Ji-fu1, YANG Ming-xing1, 2* |
1. Gemmological Institute, China University of Geosciences (Wuhan), Wuhan 430074, China
2. China University of Geosciences (Wuhan) Jewelry Testing Center, Wuhan 430074, China
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Abstract The Hanyaozi Grassland Jade Mine site was excavated and surveyed in 2014, yielding pottery shards, stone tools, and jade materials, which possess significant gemological and archaeological value. To enrich the database of Chinese nephrite and provide more accurate data support for future studies on the analysis of unearthed jade artifacts, this paper takes 38 pieces of tremolite jade collected in Hanyaozi grassland as the research object. Conventional gemological tests, as well as infrared and Raman spectroscopy, were conducted on the samples. Infrared and Raman spectroscopy instruments can rapidly determine the samples' chemical composition and impurity minerals. The results indicate that the samples are standard tremolite, with impurity minerals including sphene and amorphous carbon. Qualitative and quantitative analyses of the samples' major and trace elements were conducted using Laser Ablation-Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). The samples' rare earth element (REE) data were standardized using reported data from chondritic meteorites, resulting in a series of parameters. The ∑REE values ranged from 0.40 to 14.28, with a mean of 3.46, indicating an overall low abundance of rare earth elements. The LREE/HREE values ranged from 0.21 to 17.91, with a mean of 2.69, suggesting a slight enrichment of light rare earth elements. The REE distribution pattern exhibited a relatively flat “seagull-shaped” trend. The δEu values ranged from 0 to 3.3, with a mean of 0.58, indicating a negative Eu anomaly. Ce showed no significant anomalies. The tremolite jade from Hanjiaozi exhibited characteristic differences in REE distribution patterns compared to tremolite jade from other origins. Combining the spiderweb diagrams of trace elements of tremolite jade from the northwest mining area can further differentiate them. The uranium enrichment level (U) in Hanyaozi tremolite jade is significantly higher than in other origins. Finally, employing discriminant analysis methods in SPSS software, the trace elements of the tremolite jade in the northwest mining area were used to establish a discriminant model of origin. The results demonstrated a 100% accuracy rate in discrimination, with cross-validation rates of 98.3% respectively, affirming the distinctiveness of Hanyaozi Grassland tremolite jade from other origins. The established origin discrimination model can be utilized in subsequent provenance studies of unearthed jade artifacts.
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Received: 2024-03-20
Accepted: 2024-09-06
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Corresponding Authors:
YANG Ming-xing
E-mail: yangc@cug.edu.cn
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