Mineralogical Characteristics of Aphanitic Cryptocrystalline in Yantongshan and Its Significance for Origin

By means of optical microscope, field emission scanning electron microscope, X-ray diffraction and laser Raman spectroscopy, the mineralogical characteristics of cryptocrystalline graphite in Yantongshan, Jilin Province and its indication significance for the genesis of the deposit are studied. The...

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Published inBeijing da xue xue bao Vol. 56; no. 2; pp. 242 - 252
Main Authors Cheng, Siyu, Chuan, Xiuyun, Yang, Yang, Lin, Chao, Chen, Siyu
Format Journal Article
LanguageChinese
Published Beijing Acta Scientiarum Naturalium Universitatis Pekinenis 20.03.2020
Subjects
Crystallization
Electron microscopes
Graphite
Mineralogy
Minerals
Raman spectroscopy
Scanning electron microscopy
X-ray diffraction
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Summary:By means of optical microscope, field emission scanning electron microscope, X-ray diffraction and laser Raman spectroscopy, the mineralogical characteristics of cryptocrystalline graphite in Yantongshan, Jilin Province and its indication significance for the genesis of the deposit are studied. The diameter of graphite microcrystals is La=59-175 nm, and the stacking height is Lc=32-93 nm. The graphitization degree value ranges from 0.573 to 1.000, and the interval (002) layers vary from 0.3352 to 0.3370 nm. The intensity ratio of Dļ peak and G peak arranges between 0.07 to 0.28. On the base above, the metamorphic temperature range was calculated as 526V to 622V, with the average is 561V, indicating that the metamorphic degree could reach the amphibolite facies in its formation. The graphitization degree varied greatly, and much higher near Fe bearing minerals, indicating that the crystallization process of graphite could be catalyzed with the different spots of one graphite ore slice by Fe containing compound
ISSN:0479-8023
DOI:10.13209/j.0479-8023.2019.126