| 基于红外光谱-拉曼光谱研究山东郯城砂矿的金刚石及包裹体类型 |
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| 关键词:diamond FTIR Raman spectroscopy inclusions coesite Tancheng in Shandong |
| 基金项目:山东省地质矿产勘查开发局局控项目(编号: 202012);山东省第七地质矿产勘查院科技性创新项目(编号: QDKY202005);山东省重大科技创新工程项目(编号: 2017CXGC1607) |
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| A Study of Types of Diamonds and Inclusions in Tancheng Placer of Shandong Province Based on Infrared and Raman Spectroscopy |
| The test results of Fourier infrared spectroscopy and micro laser Raman spectroscopy of diamond in Tancheng of Shandong Province show that the intrinsic peak of C–C can be seen in infrared spectra of both methods. The absorption peaks of most visible nitrogen include the absorption peaks of diazonium, polymerized nitrogen and nitrogen wafer. Some hydrogen absorption peaks are visible: the absorption peaks of C–H, C–N and H2O. Tancheng diamonds are mainly type Ia diamonds, including type IaA, IaB, IaAB, and type IIa only possesses one grain; nitrogen types include dinitrogen (A center), polymeric nitrogen (B center) and nitrogen platelet (B' center), indicating that the solitary nitrogen (C center) in diamond has been converted into diatomic nitrogen, but some atomic nitrogen has not completed further aggregation. The diamond Raman peak is concentrated at 1131 cm–1, and the Raman displacement drift is small, indicating that the internal stress of diamond has changed slightly. Coesite inclusions were found for the first time in Tancheng diamond, whose Raman test peaks were 139 cm–1, 152 cm–1, 212 cm–1, 272 cm–1, 328 cm–1, 356 cm–1, 428 cm–1 and 529 cm–1. There are more than ten coesite inclusions in a single diamond, with diameters ranging from several μm to dozens of μm, exhibiting various shapes such as needle-shaped, dumbbell-shaped, round and short column-shaped forms. The presence of coesite inclusions in Tancheng diamonds may be a reliable indicator of the presence of eclogite-type diamonds in the Tancheng area, and also suggests that the origin of some of these diamonds must have been related to oceanic circulation or subduction processes. The black graphite spots on the inclusions of magnesium olivine have similar characteristics to those of different kinds of inclusions in diamonds from Mengyin of Shandong, Liaoning and Hunan. It is inferred that these graphite spots were caused by the change of temperature and pressure conditions of external environment after the formation of crystal inclusions. |
| LÜ Qing,JIAO Yong-xin,GE Yue-jin,XIAO Bing-jian,CHU Zhi-yuan,LIU Shu-zhen.2021.A Study of Types of Diamonds and Inclusions in Tancheng Placer of Shandong Province Based on Infrared and Raman Spectroscopy[J].Acta Geoscientica Sinica,42(6):895-906. |
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