Study on the Micro-FTIR and Raman Spectra of the Alluvial Diamonds from Yangtze Craton and Their Geological Significances
ZENG Xiang-qing1, ZHENG Yun-long1, YANG Zhi-jun1，2*, AI Qun1, HU Piao-ye1
1. Department of Geoscience, Sun Yat-Sen University, Guangzhou 510275, China 2. Guangdong Provincial Key Laboratory of Mineral Resource Exploration & Geological Processes, Guangzhou 510275, China
Abstract：The FTIR and Raman spectra of 10 diamonds from Yuanshui, Hunan province show that the alluvial diamonds from this area are mostly IaAB type, with a significant character that the A-center is enriched relatively; the nitrogen concentration in the diamonds is between 38.20 and 840.67 μg·g-1, which has a tremendous distinction in different crystal. The residence time of the diamonds in the mantle are between 0.043 and 3.315 Ga, which is also has a great difference in different diamond grains. The remotest residence time (3.315 Ga) of one diamond is older than the most aged rock (3.285 Ga) in Xiang-E-Qian-Gui contiguous zone. A remarkable environment change had took place during the process of diamonds formation. The formation depth of dodecahedral diamonds is deeper than that of the octahedral ones.
Key words：Alluvial diamonds;FTIR;Raman;Nitrogen;Residence time
曾祥清1，郑云龙1，杨志军1，2*，艾 群1，胡飘野1 . 湖南扬子地台砂矿金刚石的红外、拉曼特征及指示意义 [J]. 光谱学与光谱分析, 2013, 33(10): 2694-2699.
ZENG Xiang-qing1, ZHENG Yun-long1, YANG Zhi-jun1，2*, AI Qun1, HU Piao-ye1 . Study on the Micro-FTIR and Raman Spectra of the Alluvial Diamonds from Yangtze Craton and Their Geological Significances . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(10): 2694-2699.
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