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European Journal of Mineralogy; May, June 2003; v. 15; no. 3; p. 503-511; DOI: 10.1127/0935-1221/2003/0015-0503
© 2003 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Metal-sulfur-COH-silicate fluid mediated diamond nucleation in Kokchetav ultrahigh-pressure gneiss

Shyh-Lung HWANG1, Pouyan SHEN2,*, Tzen-Fu YUI3 and Hao-Tsu CHU4

1 Department of Materials Science and Engineering, National Dong Hwa University, Hualien, Taiwan, ROC
2 Institute of Materials Science and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
3 Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, ROC
4 Central Geological Survey, P.O. Box 968, Taipei, Taiwan, ROC

* To whom correspondence should be addressed. E-mail: pshen{at}mail.nsysu.edu.tw

Submicron metal sulfides, randomly oriented microdiamonds and phlogopite have been identified as multiphase inclusions in garnet of a garnet-clinopyroxene-quartz crustal rock from the Kokchetav Massif in Kazakhstan. Analytical electron microscopy shows that metal sulfides are entrapped among diamond aggregates away from infiltration cracks and do not exhibit any specific crystallographic relationship with associated microdiamonds, thus implying a possible syngenetic nucleation of microdiamonds from a precursive fluid containing dissolved metal sulfides. The diamonds increased in size via a spiral growth mechanism, as manifested by dislocations radiating from nuclei toward faceted surface outcrops.

Key-words: diamond, fluid, metal sulfides, inclusions in garnet, ultrahigh-pressure, metamorphism.




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