Diamond nucleation and growth by reduction of carbonate melts under high-pressure and high-temperature conditions

Research Article| August 01, 2002 Diamond nucleation and growth by reduction of carbonate melts under high-pressure and high-temperature conditions Makoto Arima; Makoto Arima 1Geological Institute, Yokohama National University 79-7, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan Search for other works by this author on: GSW Google Scholar Yusuke Kozai; Yusuke Kozai 1Geological Institute, Yokohama National University 79-7, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan Search for other works by this author on: GSW Google Scholar Minoru Akaishi Minoru Akaishi 2Advanced Materials Laboratory, National Institute for Materials Science 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan Search for other works by this author on: GSW Google Scholar Geology (2002) 30 (8): 691–694. https://doi.org/10.1130/0091-7613(2002)030<0691:DNAGBR>2.0.CO;2 Article history received: 04 Feb 2002 rev-recd: 02 Apr 2002 accepted: 12 Apr 2002 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Makoto Arima, Yusuke Kozai, Minoru Akaishi; Diamond nucleation and growth by reduction of carbonate melts under high-pressure and high-temperature conditions. Geology 2002;; 30 (8): 691–694. doi: https://doi.org/10.1130/0091-7613(2002)030<0691:DNAGBR>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract We report for the first time experimental evidence for the nucleation and growth of diamonds from carbonatitic melts by reduction in reactions with silicon metal or silicon carbide. Experiments were carried out in the CaMg(CO3)2-Si and CaMg(CO3)2-SiC systems at 7.7 GPa and temperatures of 1500–1800 °C. No graphite was added to the run powder as a carbon source; the carbonate-bearing melts supply the carbon for diamond formation. Diamond grows spontaneously from the carbonatitic melt by reducing reactions: CaMg(CO3)2 + 2Si = CaMgSi2O6 + 2C in the CaMg(CO3)2-Si system, and CaMg(CO3)2 + 2SiC = CaMgSi2O6 + 4C in the CaMg(CO3)2-SiC system. Our results provide strong experimental support for the view that some natural diamonds crystallized from carbonatitic melts by metasomatic reducing reactions with mantle solid phases. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.