Table of Contents
SRX Geosciences
Volume 2010 (2010), Article ID 504243, 5 pages
http://dx.doi.org/10.3814/2010/504243
Research Article

Metastable Nanosized Diamond Formation from Fluid Phase

1Geological Department, St. Petersburg University, 7/9 Universitetskaya Nab., St. Petersburg, 199034, Russia
2Fedorovskiy All Russian Mineral Research Institute, Moscow 119017, Russia
3Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka 142432, Russia
4Lebedev Physics Institute, Russian Academy of Sciences, Moscow 117924, Russia

Received 28 July 2009; Revised 28 August 2009; Accepted 22 September 2009

Copyright © 2010 S. K. Simakov et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

There is evidence that part of kimberlitic microdiamonds was formed at low P-T parameters corresponding to graphite stability. Microdiamonds were also discovered in ultramafic, volcanic, and different metamorphic crust rocks formed at low P-T parameters. The formation of these diamonds is probably caused by introduction of metasomatic fluids at metastable P-T parameters. In our experiments nanosized (70–80 nm) diamonds were synthesized at earth crust P-T parameters from fluid phase. Their presence was confirmed by Raman spectroscopy and electronic microscopy methods.