 | Masago, H., Rumble, D., Ernst, W. G., Parkinson, C. D., Maruyama, S. (2003) Low delta18O eclogites from the Kokchetav massif, northern Kazakhstan. Journal of Metamorphic Geology, 21 (6) 579-587 doi:10.1046/j.1525-1314.2003.00465.x | Journal (article/letter/editorial) | | 579–587 Low d18O eclogites from the Kokchetav massif, northern Kazakhstan H. MASAGO,1,* D. RUMBLE,2 W. G....silicates in eclogites and whiteschists from the Kokchetav massif were analyzed by whole-grain CO2-laser fluorination...and UHP metamorphism. Key words: eclogite; Kokchetav massif; low d18O; whiteschist. INTRODUCTION Since...1990), the Kokchetav massif has attracted the interest of geoscientists worldwide. Kokchetav metamorphic...features of the complex. The significance of the Kokchetav massif and the much greater depths of burial indicated |  | Dobrzhinetskaya, L. F., Green, H. W., Bozhilov, K. N., Mitchell, T. E., Dickerson, R. M. (2003) Crystallization environment of Kazakhstan microdiamond: evidence from nanometric inclusions and mineral associations. Journal of Metamorphic Geology, 21 (5) 425-437 doi:10.1046/j.1525-1314.2003.00452.x | Journal (article/letter/editorial) | | 21, 425–437 Crystallization environment of Kazakhstan microdiamond: evidence from nanometric inclusions...and zircon from felsic gneiss of the Kokchetav massif, Kazakhstan, have been examined utilizing electron...of 1–3 diamond crystals intergrown with quartz, phengite, phlogopite, albite, K-feldspar, rutile, apatite...essentially the same stoichiometry suggests that the Kokchetav diamond crystallized from a fluid containing variable...originate from the mantle. It is concluded that Kokchetav diamond most likely crystallized from a COH-rich |  | | Journal (article/letter/editorial) | | from diamond-bearing marble in the Kokchetav massif, northern Kazakhstan IKUO KATAYAMA1,*, MASAHITO OHTA2...of deeply subducted impure marble from the Kokchetav massif, we investigated mineral inclusions in zircon...reaction. Matrix diopsides contain abundant exsolved phengite lamellae, whereas the exsolution is absent in...matrix (0.14 wt% and 2.1 mol%, respectively). Thus, phengite exsolution occurs in matrix pyroxene with low...decompression resulted in the phengite exsolution in diopside. A trace of hydroxyl in phengite needles was perhaps |  | | Journal (article/letter/editorial) | | Diamond-Grade Eclogite from the Kokchetav Massif, Northern Kazakhstan a b c Kazuaki Okamoto , Ikuo...Diamond-Grade Eclogite from the Kokchetav Massif, Northern Kazakhstan, International Geology Review, 48:10...Diamond-Grade Eclogite from the Kokchetav Massif, Northern Kazakhstan KAZUAKI OKAMOTO,1 Institute of Earth...understand the dehydration process related to phengite decomposition during subduction of crust into...inclusions in zircons from Kokchetav diamond-grade eclogites. In the eclogites, phengite is absent from the matrix |  | | Journal (article/letter/editorial) | | partial melting in the Kumdy-Kol region (Kokchetav Massif, Northern Kazakhstan) Alexey L. Ragozin a,⁎, Juhn...U/Pb Zircon Kokchetav UHP metamorphism partial melting A B S T R A C T The Kokchetav Massif of northern...northern Kazakhstan is the best-known metamorphic diamond locality among numerous ultrahigh-pressure (UHP)...the Kumdy-Kol region was performed to constrain the age of partial melting of the Kokchetav UHP metamorphic...metamorphic terranes including the Kokchetav Massif of northern Kazakhstan (Sobolev and Shatsky, 1990), Dabie-Sulu |  | Yui, Tzen-Fu, Chu, Hao-Tsu, Hwang, Shyh-Lung, Shen, Pouyan, Wu, Tsai-Way, Liou, J.G., Sobolev, Nikolay V. (2010) Geochemistry of garnetiferous Ti–clinohumite rock and talc–kyanite–phengite–almandine schist from the Kokchetav UHP terrane, Kazakhstan: An insight to possible origins of some chemically unusual UHP rocks. Lithos, 118 (1) 131-144 doi:10.1016/j.lithos.2010.04.005 | Journal (article/letter/editorial) | | and talc–kyanite–phengite– almandine schist from the Kokchetav UHP terrane, Kazakhstan: An insight to possible...Ti–clinohumite rock Whiteschist Talc–kyanite–phengite–almandine schist Kokchetav UHP terrane a b s t r a c t Major-element...from the Kumdy Kol area, as well as talc–kyanite–phengite–almandine schists (previously named as whiteschists)...whiteschists) and eclogites from the Kulet area of the Kokchetav ultrahigh-pressure (UHP) terrane, to explore their...garnetiferous Ti–clinohumite rocks and talc–kyanite– phengite–almandine schists are possibly genetically related |  | | Journal (article/letter/editorial) | | P-T paths within the Barchi-Kol UHP terrain (Kokchetav Complex): Implications for subduction and exhumation...ultrahigh-pressure (UHP) metamorphism within the Kokchetav metamorphic belt. We provide a detailed and systematic...decompression of this rock resulted in the breakdown of phengite associated with a pervasive recrystallization...but they were exhumed along a cooler path where phengite remained stable. In these rocks, major and trace...from metamorphism of other UHP rocks within the Kokchetav metamorphic belt. Therefore, the assembly of rocks |  | | Journal (article/letter/editorial) | | thermodynamic calculations: examples from the Kokchetav Massif, Kazakhstan and the Sulu terrane, China HANS-JOACHIM...siliceous calcite-dolomite marble from the Kokchetav Massif, Kazakhstan and a dolomite marble from the UHP unit...these assemblages at P 3.5 GPa (T < 9008C). If phengite is additionally present its Si content can contribute...rocks (Sulu terrane: 3.5–1.0 GPa around 6008C; Kokchetav Massif: 7 GPa—11008C to 0.65 GPa—7008C) are compatible...marble; subduction zone; H2O-CO2 fluid; garnet; phengite; ultrahigh pressure metamorphism; thermodynamic |  | | Journal (article/letter/editorial) | | (UHPM) terranes (Erzgebirge Massif, Germany; Kokchetav Massif, Northern Kazakhstan; Rhodope Metamorphic Province... Keywords: Diamond, Raman, UHP metamorphism, Kokchetav, Erzgebirge, Rhodope Metamorphic Province introduCtion...from metamorphic rocks from the Kokchetav Massif, Northern Kazakhstan, microdiamonds have been identified...photomicrograph for each (Fig. 1). Kokchetav Massif, Northern Kazakhstan Diamond-bearing samples were selected...located about 17 km to the west (Kokchetav Massif, Northern Kazakhstan). Details of geologic and petrologic |  | | Journal (article/letter/editorial) | | garnet-clinopyroxene rock from the Kokchetav Massif, northern Kazakhstan a Kunihiko Sakamaki & Yoshihide...garnet-clinopyroxene rock from the Kokchetav Massif, northern Kazakhstan, International Geology Review, DOI:...garnet-clinopyroxene rock from the Kokchetav Massif, northern Kazakhstan Kunihiko Sakamaki* and Yoshihide...garnet-clinopyroxene rock from the Kumdy-Kol area of the Kokchetav Massif were characterized using micro-FT-IR spectroscopy...supersilicic titanite contain exsolved K-feldspar and phengite lamellae and were classified into three types |  | | Journal (article/letter/editorial) | | ultrahigh-pressure pelitic schist in the Kokchetav massif, northern Kazakhstan Hideki Masago a,⁎, Soichi Omori...from the latest Precambrian Kokchetav ultrahigh-pressure massif, Kazakhstan, using compositional zoning...in the outer-core to mantle domains. In the rim region both ilmenite and rutile are present, although...similar to the metamorphic P–T gradient of the Kokchetav massif. This result contrasts markedly with the traditional...geothermal gradient than the metamorphic geotherm of the region. On the other hand, the first evidence for ultrahigh-pressure |  | | Journal (article/letter/editorial) | | subducted carbonate rocks from the Kokchetav massif (Northern Kazakhstan) recrystallised within the diamond...diamonds in metacarbonates from the Kokchetav massif (Northern Kazakhstan) revealed the presence of a fluid...subducted carbonate rocks from the Kokchetav massif (Northern Kazakhstan). We show with Laser Ablation ICP-MS...processes. 2. Geological setting The Kokchetav massif (Northern Kazakhstan) represents a slice of continental...tectonic setting and geochronological data for this region has been provided by [18,20,23–28]. The diamondiferous |  | | Journal (article/letter/editorial) | | ultrahigh-pressure anatexis: fractionation of elements in the Kokchetav gneisses during melting at diamond-facies conditions...Berlin Heidelberg 2014 Abstract The Kokchetav complex in Kazakhstan contains garnet-bearing gneisses that...most characteristic trace element feature of the Kokchetav UHP restites is a strong depletion in light rare...lowest U, Th and LREE contents, indicating that phengite retains some LILE in the residue. Some restites...protolith. This further suggests the presence of phengite, which, in contrast to rutile, preferentially |  | | Journal (article/letter/editorial) | | eclogites from the deep subducted crust in the Kokchetav, Kazakhstan, ultrahigh-pressure metamorphic terrane...Poli 1998; Ono 1998; Okamoto and Maruyama 1999). Phengite is also stable up to 330 km depth (Schmidt 1996;...returned to the surface. Among these, the Kokchetav massif, Kazakhstan, is considered to be the highest-pressure...the hydroxyl contents of clinopyroxenes in the Kokchetav UHP eclogites using infrared (IR) micro-spectroscopy...micro-spectroscopy. GEOLOGICAL SETTING The Kokchetav massif is situated in the central domain of the composite |  | Katayama, Ikuo, Parkinson, Christopher D., Okamoto, Kazuaki, Nakajima, Youichi, Maruyama, Shigenori (2000) Supersilicic clinopyroxene and silica exsolution in UHPM eclogite and pelitic gneiss from the Kokchetav massif, Kazakhstan. American Mineralogist, 85 (10) 1368-1374 doi:10.2138/am-2000-1004 | Journal (article/letter/editorial) | | eclogite and pelitic gneiss from the Kokchetav massif, Kazakhstan IKUO KATAYAMA,1,* CHRISTOPHER D. PARKINSON...matrix clinopyroxene of eclogite from the Kokchetav massif, Kazakhstan. These rocks are diamond-grade, ultrahigh-pressure...containing 2.6 wt% exsolved quartz from the Munchberg Massif, and derived a Ca-Na pyroxene with 10 mol% of the...from eclogites from the Kumdykol region of the Kokchetav massif, Kazakhstan. The eclogite is intercalated... diamonds have been identified in the Kumdykol region (Sobolev and Shatsky 1990; Katayama et al. 1998) |  | | Journal (article/letter/editorial) | | prograde zoning pattern in clinopyroxene from the Kokchetav diamond-grade metamorphic rocks: Missing part...melting Second critical end point UHPM history Kokchetav massif a b s t r a c t Despite extensive studies...studies of calc-silicate rocks of the Kokchetav massif, there is no satisfactory explanation of the origin...diamond-free UHP calc-silicate rocks of the Kokchetav massif. We believe that the crystallization of potassium-bearing...metamorphic (UHPM) rocks from the Kokchetav massif (Northern Kazakhstan) and particularly impure marbles |  | Hwang, Shyh-Lung, Shen, Pouyan, Chu, Hao-Tsu, Yui, Tzen-Fu (2006) A New Occurrence and New Data on Akdalaite, a Retrograde Mineral from UHP Whiteschist, Kokchetav Massif, Northern Kazakhstan. International Geology Review, 48 (8) 754-764 doi:10.2747/0020-6814.48.8.754 | Journal (article/letter/editorial) | | Retrograde Mineral from UHP Whiteschist, Kokchetav Massif, Northern Kazakhstan a b c Shyh-Lung Hwang , Pouyan...Retrograde Mineral from UHP Whiteschist, Kokchetav Massif, Northern Kazakhstan, International Geology Review, 48:8...Retrograde Mineral from UHP Whiteschist, Kokchetav Massif, Northern Kazakhstan SHYH-LUNG HWANG,1 Department of...whiteschist from the Kulet Kol region, Kokchetav Massif, northern Kazakhstan. The akdalaite crystals, ~0...at 17:55 28 December 2014 AKDALAITE, NORTHERN KAZAKHSTAN 755 FIG. 1. Optical micrograph under transmitted |  | | Journal (article/letter/editorial) | | microdiamond in UHP dolomite marble from Kokchetav Massif, Kazakhstan H. ISHIDA,1 Y. OGASAWARA,1 K. OHSUMI2...microdiamond in dolomite marble from Kumdy-kol in the Kokchetav Massif, are unusual; a previous study estimated the...distinct stages. Key words: dolomite marble; Kokchetav Massif; microdiamond; micro-Laue diffraction; ultrahigh-pressure...1999). The microdiamonds in the Kokchetav Massif, northern Kazakhstan are of crustal origin, formed during...in China (Xu et al., 1992), the Western Gneiss Region in Norway (Dobrzhinetskaya et al., 1995), Saxonian |  | | Journal (article/letter/editorial) | | kokchetavite in the polyphase mineral inclusions from Kokchetav UHP calc-silicate rocks: evidence from confocal...K-cymrite (KAlSi3O8H2O) in association with muscovite/phengite, lollingite, calcite and a-cristobalite in polyphase...metamorphic (UHPM) rocks from the Kokchetav Complex (northern Kazakhstan). Experiments have shown that K-cymrite...the calc-silicate rocks of the Kokchetav Complex (northern Kazakhstan) and discuss the mechanism of kokchetavite...inclusions consisting of quartz, siliceous glass, phengite, phlogopite titanite calcite zircon in garnet |  | Hermann, Jörg, Rubatto, Daniela, Korsakov, Andrei, Shatsky, Vladislav S. (2001) Multiple zircon growth during fast exhumation of diamondiferous, deeply subducted continental crust (Kokchetav Massif, Kazakhstan) Contributions to Mineralogy and Petrology, 141 (1) 66-82 doi:10.1007/s004100000218 | Journal (article/letter/editorial) | | deeply subducted continental crust (Kokchetav Massif, Kazakhstan) Received: 15 August 2000 / Accepted:...Abstract Diamondiferous rocks from the Kokchetav Massif, Kazakhstan, represent deeply subducted continental...contains diamond, coesite, omphacite and titanian phengite inclusions providing evidence that it formed at...subducted continental crust is the Kokchetav Massif in Kazakhstan where diamond-bearing metamorphic rocks...rocks occur (Fig. 1). Previous dating of the Kokchetav rocks has provided some constraints on the age |  | | Journal (article/letter/editorial) | | titanite in UHP marble from the Kokchetav Massif, northern Kazakhstan YOSHIHIDE OGASAWARA,1,* KYOKA FUKASAWA...Kumdykol in the Kokchetav UHP (ultrahigh-pressure) metamorphic terrane, northern Kazakhstan. This impure...diopside + zoisite, with minor amount of titanite, phengite, and garnet. No diamond was found in the marble...of the UHP metamorphic unit. INTRODUCTION The Kokchetav terrane (Fig. 1) is well known for its ultrahigh-pressure...Kumdy-kol show the highest-pressure conditions in the Kokchetav terrane and are attracting much attention as examples |  | Katayama, Ikuo, Maruyama, Shigenori, Parkinson, Christopher D, Terada, Kentaro, Sano, Yuji (2001) Ion micro-probe U–Pb zircon geochronology of peak and retrograde stages of ultrahigh-pressure metamorphic rocks from the Kokchetav massif, northern Kazakhstan. Earth and Planetary Science Letters, 188 (1) 185-198 doi:10.1016/s0012-821x(01)00319-3 | Journal (article/letter/editorial) | | ultrahigh-pressure metamorphic rocks from the Kokchetav massif, northern Kazakhstan Ikuo Katayama a; *, Shigenori Maruyama...constrain the age and geodynamic significance of the Kokchetav ultrahigh-pressure (UHP) metamorphic rocks, which...Middle Proterozoic supracrustal protoliths of the Kokchetav UHP^HP rocks were subducted to mantle depths in...approximately 5 km/Ma. The rapid exhumation rate for the massif is in the same range as other UHP metamorphic terranes...Keywords: SHRIMP data; probe; U/Pb; zircon; Kokchetav Kazakhstan; mineral inclusions; polym metamorphism |  | | Journal (article/letter/editorial) | | Chagan-Uzun (Gorny Altai), Chara (East Kazakhstan), Kokchetav (North Kazakhstan), and Maksyutov (Southern Urals)...Carboniferous–Permian collision of the Siberian and Kazakhstan continents and represents a strike-slip zone...accretionary wedge at the margin of the Kazakhstan continent. The Kokchetav and Maksyutov foldbelts of, respectively...continent/island arc or microcontinent collision (the Kokchetav megamélange and the lower unit of the Maksyutov...Altai, West Sayan, Tuva (Russia), Kokchetav, and Chara (Kazakhstan) resulted from several collisional |  | | Journal (article/letter/editorial) | | UHP paragenesis consists of coesite, kyanite, phengite, clinopyroxene, and garnet in subducted continental...buffered by coexisting phases. The Si content of phengite and biotite increase with increasing pressure...path is situated within the stability field of phengite, i.e. if there is cooling during exhumation or...occurred at T <700 C. In contrast, break down of phengite and concomitant partial melting in terranes that...years ago when coesite was found in the Dora Maira Massif, Alps (Chopin 1984). This provides evidence that |  | | Journal (article/letter/editorial) | | UHP paragenesis consists of coesite, kyanite, phengite, clinopyroxene, and garnet in subducted continental...buffered by coexisting phases. The Si content of phengite and biotite increase with increasing pressure...path is situated within the stability field of phengite, i.e. if there is cooling during exhumation or...occurred at T <700 C. In contrast, break down of phengite and concomitant partial melting in terranes that...years ago when coesite was found in the Dora Maira Massif, Alps (Chopin 1984). This provides evidence that |
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