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Elements; March 2005; v. 1; no. 2; p. 91-96; DOI: 10.2113/gselements.1.2.91
© 2005 Mineralogical Society of America
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Microdiamonds in Ultrahigh-Pressure Metamorphic Rocks

Yoshihide Ogasawara1

1 Department of Earth Sciences, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo 169-8050, Japan
E-mail: yoshi777{at}waseda.jp

Since the first report of microdiamonds of metamorphic origin in crustal rocks of the Kokchetav Massif, northern Kazakhstan, diamonds have been described from several other ultrahigh-pressure (UHP) metamorphic terranes. In situ diamond is the best indicator of ultrahigh-pressure conditions (>4 GPa), and testifies to subduction of continental crust to depths within the diamond stability field followed by relatively rapid exhumation. In contrast to other UHP terranes, the Kokchetav Massif contains rocks with unusually abundant diamonds, particularly in the Kumdy-Kol region. Kumdy-Kol diamonds exhibit diverse morphologies, dependent upon the host rock. Raman and cathodoluminescence spectra and carbon isotope compositions differ between core and rim, indicating two distinct growth stages.

KEYWORDS: microdiamond, ultrahigh-pressure metamorphism, continental collision, Kokchetav




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