Specific spectroscopic features of yellow cuboid diamonds from placers in the north-eastern Siberian Platform

Journal of Geosciences

article

Rudolf I. Mashkovtsev¹  Marianna I. Rakhmanova²  Dmitry A. Zedgenizov¹ 

[1] Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences;Nikolaev Institute of Inorganic Chemistry Siberian Branch Russian Academy of Sciences;Zavaritsky Institute of Geology and Geochemistry Ural Branch Russian Academy of Sciences

关键词: diamond;    cuboid;    defects;    nitrogen;    Siberian platform;   

DOI  :  10.3190/jgeosci.323

学科分类：自动化工程

来源: Ceska Geologicka Spolecnost / Czech Geological Society

【 摘 要 】

A series of yellow cuboid diamonds from alluvial placers in the north-eastern Siberian platform have been examined withFourier-transform infrared (FTIR) absorption spectroscopy, photoluminescence (PL) and electron paramagnetic resonance(EPR). All crystals having characteristic FTIR spectra with predominantly C and A centres belong to mixed type IaA/Ibwith small total nitrogen content (up to 330 ppm). PL is characterized by many bands with two bands related to the NV0and NV– centres common to all the samples. The FTIR spectra are also characterized by deformation-induced ‘amber’centers. Some of the yellow diamonds studied show new bands at 4272, 4548, and 5960 cm–1 instead of the bands at4060 and 4170 cm–1 common for ‘amber’ centres. An EPR study has revealed the presence of OK1 centres associatedwith titanium impurity. The plastic deformation of the studied diamonds is expressed as a ‘tatami’ strain pattern in thefeatures of their internal structure.

【 授权许可】

CC BY