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| Study on the CL and FTIR Spectra of the Alluvial Diamond from Western Yangtze Craton and Its Significance in the Growth Rate Analysis of the Diamond |
| YANG Zhi-jun1, 2, ZHOU Wen-xiu1, ZENG Xuan1, HUANG Shan-shan1, LI Xiao-xiao1, CHEN Yao-ming1 |
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 |
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Abstract In order to provide scientific clues for reconstructing effectively the process of natural diamond growth, the diamond sample from the western Yangtze Craton is studied with CL and FTIR spectra. In the paper, the micro-section of growth of the sample was defined with CL spectra, while the growth time of each diamond section was determined with FTIR spectra; besides, the growth rate of the diamond section was calculated. The results of CL and FTIR spectra analysis of the sample show that there are early CL growth zonings which are terrace and jagged straight zonings and late CLre-growth zonings in the diamond. The concentration of nitrogen varies greatly from 47.88~321.89 μg·g-1 in the diamond which is type IaAB. The minimal crystalline temperature of the sample is 1 490 K. The residence time of the diamond section in the mantle depending on the positions varies greatly from 0.264~4.6 Ga. The growth rate of the diamond section depending on the positions is 9.26~5 218.18 μm·Ga-1. Furthermore, the growth of the different diamond section is heterogeneous with preferential direction.
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Received: 2016-01-04
Accepted: 2016-05-12
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