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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Central Asia
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Kazakhstan
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Kokchetav Kazakhstan
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Kokchetav Massif (3)
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Siberian Platform (1)
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Yakutia Russian Federation
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Udachnaya Pipe (1)
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Commonwealth of Independent States
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Kazakhstan
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Kokchetav Kazakhstan
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Kokchetav Massif (3)
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Russian Federation
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Siberian Platform (1)
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Yakutia Russian Federation
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Udachnaya Pipe (1)
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Europe
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Alps
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Piedmont Alps
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Dora Maira Massif (1)
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Western Alps
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Cottian Alps
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Dora Maira Massif (1)
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Southern Europe
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Italy
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Piemonte Italy
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Dora Maira Massif (1)
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Western Europe
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Cottian Alps
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Dora Maira Massif (1)
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South America
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Brazil
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Mato Grosso Brazil (1)
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commodities
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diamond deposits (1)
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placers (1)
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elements, isotopes
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carbon
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C-13/C-12 (1)
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isotope ratios (1)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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metals
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alkaline earth metals
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calcium (1)
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titanium (1)
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nitrogen (2)
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igneous rocks
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igneous rocks
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carbonatites (1)
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kimberlite (1)
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plutonic rocks
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ultramafics
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peridotites (2)
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metamorphic rocks
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metamorphic rocks
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eclogite (2)
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gneisses (1)
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minerals
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native elements
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diamond (5)
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silicates
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chain silicates
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pyroxene group
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clinopyroxene (1)
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orthosilicates
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nesosilicates
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garnet group (3)
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merwinite (1)
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zircon group
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zircon (1)
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sorosilicates
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epidote group
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clinozoisite (1)
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sheet silicates
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mica group
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biotite (1)
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Primary terms
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Asia
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Central Asia
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Kazakhstan
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Kokchetav Kazakhstan
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Kokchetav Massif (3)
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Siberian Platform (1)
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Yakutia Russian Federation
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Udachnaya Pipe (1)
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carbon
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C-13/C-12 (1)
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crystal chemistry (2)
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crystal growth (2)
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diamond deposits (1)
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Europe
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Alps
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Piedmont Alps
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Dora Maira Massif (1)
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Western Alps
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Cottian Alps
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Dora Maira Massif (1)
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Southern Europe
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Italy
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Piemonte Italy
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Dora Maira Massif (1)
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Western Europe
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Cottian Alps
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Dora Maira Massif (1)
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igneous rocks
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carbonatites (1)
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kimberlite (1)
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plutonic rocks
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ultramafics
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peridotites (2)
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inclusions (3)
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intrusions (1)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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mantle (2)
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metals
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alkaline earth metals
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calcium (1)
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titanium (1)
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metamorphic rocks
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eclogite (2)
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gneisses (1)
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metamorphism (2)
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nitrogen (2)
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paragenesis (1)
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placers (1)
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sediments
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clastic sediments
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alluvium (1)
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South America
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Brazil
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Mato Grosso Brazil (1)
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X-ray analysis (1)
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sediments
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sediments
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clastic sediments
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alluvium (1)
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Carbon isotopes and nitrogen contents in placer diamonds from the NE Siberian craton: implications for diamond origins
Merwinite in diamond from São Luiz, Brazil: A new mineral of the Ca-rich mantle environment
Distribution of OK1, N3 and NU1 defects in diamond crystals of different habits
UHP-metamorphic rocks from Dora Maira/Western Alps and Kokchetav/Kazakhstan : New insights using cathodoluminescence petrography
Abstract The recognition of abundant microdiamonds included along with coesite in primary rock-forming minerals and zircons of metamorphic rocks from the Kokchetav massif, Northern Kazakhstan ( Sobolev & Shatsky, 1990 ; Shatsky et al. , 1991 ; Sobolev et al. , 1991 ) indicates that crustal segments reached pressures of the order of at least 40 kbar (4 GPa), implying their subduction to depths greater than 100 km. The Kokchetav massif became internationally recognised as the type locality of diamondiferous metamorphic rocks; the petrological study of diamondiferous ultrahigh pressure (UHP) rocks provides a unique insight into the formation of diamond in crustal rocks at very high pressures. Along with the finding of coesite ( Chopin, 1984 ) the discovery of diamond in supracrustal rocks has drastically changed the current ideas concerning the limits of UHP metamorphism of supracrustal rocks. The specific features and significance of such unique ultrahigh pressure metamorphism have been extensively discussed in different works ( e.g. Coleman & Wang, 1995 ) and in numerous subsequent publications ( Ernst & Liou, 2000 ). However, some workers preferred a hypothesis of a metastable diamond growth at low P–T parameters ( Ekimova et al. , 1994 ). The most recent collection of papers devoted specifically to petrotectonic characteristics of the Kokchetav massif is published as a special issue of island Arc ( Liou & Banno, 2000 ). The significance of metamorphic processes at the origin of a new type of diamond has been extensively discussed ( e.g. Haggerty, 1999 ). it is important to note that the Kumdy-Kol microdiamond deposit covers only a small portion of a more than 200 square km large area in which diamondiferous rocks are distributed in the Kokchetav massif ( Shatsky et al. , 1991 ; Dobretsov et al. , 1999a ). The proven microdiamond reserves of this deposit exceed 3 billion carats ( e.g. Haggerty, 1999 ), making it an absolutely unique phenomenon worldwide. Apart from the Kokchetav massif, occurrences of microdiamonds in other UHP metamorphic terranes elsewhere are less well documented because of the need of bulk extraction and the lack of an unambiguous confirmation of microdiamond in situ ( Xu et al. , 1992 ; Dobrzhinetskaya et al. , 1995 ). Another microdiamond locality in gneisses, confirmed by direct observations of thin sections, is from Erzgebirge, Germany, which has been suggested to be similar to the type locality of the Kokchetav massif ( Massonne, 1999 ; Stöckhert et al. , 2001 ).