(Barchi-Kol)
Diamond ore bodies, hosted in metasedimentary rocks intercalated with metavolcanic rocks within an ultra-high pressure (UHP) metamorphic terrane (Kokshetau massif), formed during a Palaeozoic continental collision.
The ore bodies consist of feldspathic gneisses and quartz-rich rocks intercalated with calc-silicate rocks, marbles, and layered garnet pyroxenites with enclosed lenses of eclogite. The diamonds are typically 1-80 µm in diameter and occur as inclusions in virtually all rock-forming minerals, even though some of these minerals are unstable under the conditions of diamond formation. Diamonds are also preserved in chlorite-sericite aggregates that replace garnet, and it is found in sericite pseudomorphs after plagioclase in garnet-biotite and garnet-two-mica gneisses. They show no connection with the eclogites. Instead, the diamond ore bodies occur within ductile and semi-ductile shear zones that cut the eclogite facies rocks at acute angles.
Located about 17 km west of Lake Kumdykol.
External Links
- European Journal of Mineralogy 14(5):915-928.
- Dobrzhinetskaya, L.F., Green, H.W., Bozhilov, K.N., Mitchell, T.E., and Dickerson, R.M. (2003): Crystallization environment of Kazakhstan microdiamond: evidence from nanometric inclusions and mineral associations. Journal of Metamorphic Geology 21, 425-437.
- Pechnikov, V.A. & Kaminsky, F.V. (2011): Structural and microstructural regularities of the distribution of diamond in metamorphic rocks of the Kumdy-Kol and Barchi-Kol deposits, Kokchetav Massif, Northern Kazakhstan. Canadian Mineralogist. 49, 673-690
Mineral List
10 entries listed. 6 valid minerals.
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