Study on the Micro-FTIR Spectra of the Euhedral Faceted Polycrystalline Diamonds (EFPCDs) from Western Yangtze Craton and Its Geological Significance
HU Piao-ye1, ZENG Liang-liang1, YANG Zhi-jun1, 2*, FU Hai-fu1, LIU Si-wei1, SHEN Wen-jie1, PENG Zhuo-lun1
1. School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou 510275, China 2. Guangdong Provincial Key Laboratory of Mineral Resource Exploration & Geological Processes, Guangzhou 510275, China
Abstract:The results of Micro-FTIR spectra analysis of the euhedral faceted polycrystalline diamonds(EFPCDs) from the Western Yangtze Craton show that the EFPCDs are mostly IaAB type, the concentration of nitrogen varies greatly from 25.70~358.35 μg·g-1. Different nitrogen content distributes in different diamond grains or position in same sample. The C Center was not found in the samples and the conversion from A center to B center is incomplete, in the meanwhile, B% value concentrated in 40%. Thus,polycrystalline diamonds are not formed in the stage of nucleation but gathered together after formation of the individual diamond grains during the residence time in the mantle. And its formation environment is more complex than the euhedral faceted polycrystalline diamonds from Mengyin kimberlite,the Eastern of North China Craton. The diamonds extremely possibly originated in the deep mantle from 160 to 180 km, reaching the depth of the core of the Yangtze Craton, at the same time it is close to the bottom of the lithosphere. The C—H bond of sp2 hybridization are conducive to the formation of platelets in diamonds. Meanwhile, its concentrations are generally higher than the C—H bond of sp3 hybridization in the samples.
胡飘野1,曾亮亮1,杨志军1, 2*,傅海福1,刘思微1,沈文杰1,彭卓伦1 . 扬子克拉通西部砂矿型刻面状金刚石多晶的显微红外光谱研究及意义 [J]. 光谱学与光谱分析, 2015, 35(06): 1534-1538.
HU Piao-ye1, ZENG Liang-liang1, YANG Zhi-jun1, 2*, FU Hai-fu1, LIU Si-wei1, SHEN Wen-jie1, PENG Zhuo-lun1 . Study on the Micro-FTIR Spectra of the Euhedral Faceted Polycrystalline Diamonds (EFPCDs) from Western Yangtze Craton and Its Geological Significance . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(06): 1534-1538.
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