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Influence of the fluid composition on diamond dissolution forms in carbonate melts
-
Alexander F. Khokhryakov
und
Yuri N. Pal’yanov
Veröffentlicht/Copyright:
2. April 2015
Abstract
The influence of СО2 and Н2О on the morphology of diamond dissolution in carbonate melts was studied experimentally at pressure 5.7-7.0 GPa and temperature 1400-1750 °С, using a BARS multi-anvil apparatus. It has been established that diamond dissolution in fluid-free carbonate melts starts with the development of positive trigons on the {111} diamond faces, followed by truncation of crystal edges by trigon-trioctahedral surfaces, and finally by the transformation of diamond into spherical dodecahedroid-like morphology. Diamond dissolution in СО2-bearing carbonate melts also begins with the formation of positive trigons on the {111} faces and development trigon-trioctahedron surfaces on the edges. Dissolution form changes from trigon-trioctahedron to dodecahedroid with increasing loss of initial weight. Addition of more than 8 wt% of Н2О into the carbonate medium changes the orientation of the trigons and the secondary morphology of diamond. At the beginning of the process, negative trigons and ditrigonal (shield-shaped) dissolution layers developed on the {111} faces. Dissolution form of diamond in water-bearing melts is tetrahexahedroid, which is most similar to rounded natural diamonds. The results obtained allow us to regard the morphology of trigons and dissolution forms as an indicator of the composition of the diamond dissolution medium. The experiments suggest that the morphology of diamond during dissolution is controlled by the presence of water in a system. Our data show that the СО2/(СО2+Н2О) ratio by weight value was <0.81 during natural diamond dissolution.
Received: 2009-11-6
Accepted: 2010-6-14
Published Online: 2015-4-2
Published in Print: 2010-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
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