|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 Geological Institute, Yokohama National University 79-7, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
2 Advanced Materials Laboratory, National Institute for Materials Science 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan
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.
Key Words: diamond formation • moissanite • metasomatic reducing reaction • carbonatitic melts
This article has been cited by other articles:
|
|
 |
|
  A. V. Spivak, Y. A. Litvin, A. V. Shushkanova, V. Yu. Litvin, and A. A. Shiryaev Diamond formation in carbonate-silicate-sulfide-carbon melts: Raman- and IR-microspectroscopy European Journal of Mineralogy, June 1, 2008; 20(3): 341 - 347. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Arima and Y. Kozai Diamond dissolution rates in kimberlitic melts at 1300-1500 {degrees}C in the graphite stability field European Journal of Mineralogy, June 1, 2008; 20(3): 357 - 364. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Y. N. Palyanov, V. S. Shatsky, N. V. Sobolev, and A. G. Sokol High-Pressure Geoscience Special Feature: The role of mantle ultrapotassic fluids in diamond formation PNAS, May 29, 2007; 104(22): 9122 - 9127. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Y. A. Litvin High-pressure mineralogy of diamond genesis Geological Society of America Special Papers, January 1, 2007; 421(0): 83 - 103. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. C. Gunn and R. W. Luth Carbonate reduction by Fe-S-O melts at high pressure and high temperature American Mineralogist, July 1, 2006; 91(7): 1110 - 1116. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. Kozai and M. Arima Experimental study on diamond dissolution in kimberlitic and lamproitic melts at 1300-1420 {degrees}C and 1 GPa with controlled oxygen partial pressure American Mineralogist, November 1, 2005; 90(11-12): 1759 - 1766. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. N. Ducea, J. Saleeby, J. Morrison, and V. A. Valencia Subducted carbonates, metasomatism of mantle wedges, and possible connections to diamond formation: An example from California American Mineralogist, May 1, 2005; 90(5-6): 864 - 870. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. N. PAL'YANOV, A. G. SOKOL, A. A. TOMILENKO, and N. V. SOBOLEV Conditions of diamond formation through carbonate-silicate interaction European Journal of Mineralogy, April 1, 2005; 17(2): 207 - 214. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 D. A. Zedgenizov, D. A. Zedgenizov, H. Kagi, V. S. Shatsky, and N. V. Sobolev Carbonatitic melts in cuboid diamonds from Udachnaya kimberlite pipe (Yakutia): evidence from vibrational spectroscopy Mineralogical Magazine, February 1, 2004; 68(1): 61 - 73. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
