 | Robles-Cruz, Sandra, Melgarejo, Joan, Galí, Salvador, Escayola, Monica (2012) Major- and Trace-Element Compositions of Indicator Minerals that Occur as Macro- and Megacrysts, and of Xenoliths, from Kimberlites in Northeastern Angola. Minerals, 2 (4) 318-337 doi:10.3390/min2040318 | Journal (article/letter/editorial) | | of Xenoliths, from Kimberlites in Northeastern Angola Sandra E. Robles-Cruz 1,*, Joan Carles Melgarejo...in the Lucapa area, northeastern Angola: Tchiuzo, Anomaly 116, Catoca, Alto Cuilo-4, Alto Cuilo-63 and...petrogenetic evolution of the kimberlites in northeastern Angola and have important implications for diamond exploration...exploration. Minerals 2012, 2 319 Keywords: Angola; kimberlite; olivine; garnet; clinopyroxene; diamond;...xenoliths; REE; Sm/Nd isotopes 1. Introduction In Angola, more than 700 occurrences of kimberlite are distributed |  | Robles-Cruz, Sandra E., Escayola, Monica, Jackson, Simon, Galí, Salvador, Pervov, Vladimir, Watangua, Manuel, Gonçalves, Antonio, Melgarejo, Joan Carles (2012) U–Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration. Chemical Geology, 310. 137-147 doi:10.1016/j.chemgeo.2012.04.001 | Journal (article/letter/editorial) | | SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration...0E8, Canada d Sociedade Mineira de Catoca, Catoca, Lunda Sul, Angola e Departamento de Geologia, Universidade...Agostinho Neto, Av. 4 de Fevereiro 7, 815 Luanda, Angola b c a r t i c l e i n f o Article history: Received...U–Pb dating SHRIMP Geochronology Zircon Diamond Catoca kimberlite a b s t r a c t We present the first...zircon from the diamondiferous Catoca kimberlite in northeastern Angola, the fourth largest kimberlite |  | | Journal (article/letter/editorial) | | of Saint Petersburg, Russia c Catoca Geological-Mining Community, Angola Ac ce p te d M an us cr...age of upper mantle eclogite xenoliths from the Catoca and Cat-115 (Kasai Craton) pipes are presented...ratios. an The Nb/Ta and Nb/La ratios in the Catoca eclogites range from chondritic to superchondritic...and forming inclusions in diamonds. Because the Catoca kimberlite pipe is one of the richest diamond-bearing...on eclogite xenoliths from the Catoca and CAT-115 (Kasai Craton, Angola) kimberlite pipes, which are common |  | | Journal (article/letter/editorial) | | carat Lesotho Promise, recovered from the Letseng Mine in 2006, help to drive a multi-billion dollar diamond...countries, Botswana, Russia, Canada, South Africa and Angola account for 83% by value and 65% by weight of annual...quarter of 2008 with most work carried out in Canada, Angola, Democratic Republic of the Congo (DRC) and Botswana...2006 from Gem Diamonds Limited's Letseng le Terai Mine in the north eastern highlands of the Kingdom of...pdf Botswana, Russia, Canada, South Africa and Angola (in this order) were the top five diamond producing |  | Ashchepkov, I.V., Vladykin, N.V., Ntaflos, T., Downes, H., Mitchell, R., Smelov, A.P., Alymova, N.V., Kostrovitsky, S.I., Rotman, A. Ya, Smarov, G.P., Makovchuk, I.V., Stegnitsky, Yu.B., Nigmatulina, E.N., Khmelnikova, O.S. (2013) Regularities and mechanism of formation of the mantle lithosphere structure beneath the Siberian Craton in comparison with other cratons. Gondwana Research, 23 (1) 4-24 doi:10.1016/j.gr.2012.03.009 | Journal (article/letter/editorial) | | pipes (Ashchepkov et al., 2012b) pipes and for Catoca pipe (Ashchepkov et al., in press). New diagrams...V—Hapchan; VI—Birekte; VII–XII—Aldan–Stanovoy province: VII—Olekma, VIII—Central Aldan, IX—East Aldan...the melt feeders because the largest pipes like Catoca have much higher sub-calcic garnets (Ashchepkov...studied pipes. The Mesozoic mantle geotherms from NE Angola (Fig. 13A), Congo (Batumike et al., 2009) (Fig...al. / Gondwana Research 23 (2013) 4–24 A 0 0 Catoca 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 |  | Klöcking, M., Hoggard, M.J., Rodríguez Tribaldos, V., Richards, F.D., Guimarães, A.R., Maclennan, J., White, N.J. (2020) A tale of two domes: Neogene to recent volcanism and dynamic uplift of northeast Brazil and southwest Africa. Earth and Planetary Science Letters, 547. 116464pp. doi:10.1016/j.epsl.2020.116464 | Journal (article/letter/editorial) | | contribution from metasomatised lithospheric mantle. In Angola, melting of metasomatised lithosphere is probably...100 km beneath Angola and could be as thin as 60 km in the Borborema Province. For Angola, thermobarometry...topographic domes in northeast Brazil (BP; Borborema Province) and southwest Africa (AD; Angolan dome). (b)...(Ma); grey lines = geological province boundaries; BP = Borborema Province; F = Fortaleza; FN = Fernando...southwest Africa. 2. Geological setting The Borborema Province of northeast Brazil is a Precambrian domain that |  | | Journal (article/letter/editorial) | | extensive alteration and possibility includes enstatite. Type 4 Mn-rich ilmenite is produced before the...the older ilmenite generations from the Catoca pipe (Angola). Those authors also demonstrated that polycrystalline...relatively rich in Fe3+. This ferric character occurs in Catoca (Robles-Cruz et al. 2009) and in the Indian kimberlites...Megacrysts from the Grib kimberlite pipe (Arkhangelsk Province, Russia). Lithos 77:511–523 Kostrovitsky SI, Alymova...various diamondiferous fields of the Yakutian province. Dokl Earth Sci 406:19–23 Mitchell RH (2013) Paragenesis |  | Ashchepkov, Igor, Logvinova, Alla, Spetsius, Zdislav, Downes, Hilary, Ntaflos, Theodoros, Ivanov, Alexandr, Zinchenko, Vladimir, Kostrovitsky, Sergey, Ovchinnikov, Yury (2022) Eclogite Varieties and Their Positions in the Cratonic Mantle Lithosphere beneath Siberian Craton and Archean Cratons Worldwide. Minerals, 12 (11) 1353 doi:10.3390/min12111353 | Journal (article/letter/editorial) | | Russia CATOCA Mining Society, Av. Talatona, N/N, Quarter GU-01, Luanda 10257-10398, Angola Correspondence:...part of the Dharwar craton in India [69,83,84], Angola [85–87], and several localities from South Africa...(A) 0 T oC Fe# Ol in equilibrium with Cpx, Gar Catoca cluster 1 2 1 2 Gr Hi-Mg GrA2 3 45 mw/m2...Dharwar craton; Catoca cluster kimberlites. Symbols the same as for Figure 3. (B) Catoca cluster kimberlites...Roberts Victor pipe, Kaapvaal Craton, Africa 5.4. Catoca pipe, Craton, Africa This Congo pipe, Kasai the |  | | Journal (article/letter/editorial) | | northeastern Angola, which hosts most of the kimberlites of the Congo Craton including Catoca, the world's...alluvial diamonds of the Kasai River, Katanga Province, Democratic Republic of the Congo (DRC), whose...of the cratonic mantle underpinning northeastern Angola. In the fifth paper of the category, Rudloff-Grund...peridotitic paragenesis (rutile + forsterite + enstatite + Cr-diopside + Cr-pyrope) preserved in diamond |  | | Journal (article/letter/editorial) | | 93 kimberlite pipes and veins in the Yakutian province (more than 7500 major component analyses), the...Olenekskaya provinces in the Yakutian kimberlite province was GEOCHEMISTRY INTERNATIONAL Vol. 50 No. 12...for the exam ined portion of the diamondiferous province (Table 6). This model for unaltered kimberlites...of the lithos phere in the Yakutian kimberlite province decreases from south to north, the distribution...fields in a seismic map of the diamondiferous province [21]: the data points of the fields swarm at |  | Kostrovitsky, S.I., Yakovlev, D.A., Soltys, A., Ivanov, A.S., Matsyuk, S.S., Robles-Cruz, S.E. (2020) A genetic relationship between magnesian ilmenite and kimberlites of the Yakutian diamond fields. Ore Geology Reviews, 120. 103419 doi:10.1016/j.oregeorev.2020.103419 | Journal (article/letter/editorial) | | diamondiferous kimberlite fields in the Yakutian province. This combined data set includes 10,874 analyses...diamondiferous kimberlite fields in the Yakutian province. The pipes locations with each field, are reported...in the diamond fields of the Yakutian kimberlite province (YKP). Mineralogical assessment of these intrusions...different diamondiferous fields of the Yakutian province (in parentheses - the number of analyses). TiO2...diamond-bearing kimberlite fields of the Yakutian province: A Mirninsky; B - Daldynsky; C - Alakit-Marhinsky; |  | | Journal (article/letter/editorial) | | of the Daldyn field in the Yakutian kimberlite province. The representativity of the ilmenites sampled...of the Daldyn field in the Yakutian kimberlite province. Mg-bearing ilmenite (Ilm) is one of the most...different pipes in various fields of the Yakutian province. Academician N.V. Sobolev (1977, 1980 and 1984)...lithodemic units of kimberlite volcanism are: province, field, cluster, pipe, dyke and sill. These units...within the Daldyn field of Yakutian kimberlite province. This field is an ideal object of research, since |  | Ashchepkov, I. V., Alymova, N. V., Logvinova, A. M., Vladykin, N. V., Kuligin, S. S., Mityukhin, S. I., Downes, H., Stegnitsky, Yu. B., Prokopiev, S. A., Salikhov, R. F., Palessky, V. S., Khmel'nikova, O. S. (2014) Picroilmenites in Yakutian kimberlites: variations and genetic models. Solid Earth, 5 (2). 915-938 doi:10.5194/se-5-915-2014 | Journal (article/letter/editorial) | | compositions from different regions Yakutian kimberlite province (Daldyn, Alakit and Malo-Botuobinsky fields)....from different regions within Yakutian kimberlite province (Nakyn, Upper Muna and Anabar fields). 1. Ilmenites...the Mg-rich and Fe-rich varieties, for example in Angola (Robles-Cruz et al., 2009; Ashchepkov et al., 2012)...ilmenite-bearing association form kimberlites of Yakutian province, Ph.D. dissertation thesis, Irkutsk, Institute...mantle beneath kimberlite pipes from the Catoca cluster, Angola, Tectonophysics, 530–531, 128–151, 2012 |  | | Journal (article/letter/editorial) | | central part of the Arkhangelsk diamondiferous 16 province (ADP). Based on the concentrations of Cr2O3, CaO...mantle beneath the Arkhangelsk diamondiferous province (ADP) is one 71 of the most poorly characterized...setting and samples The Arkhangelsk diamondiferous province (ADP) is located in the northern part of the ...beneath kimberlite pipes from the 491 Catoca cluster, Angola. Tectonophysics 530–531, 128–151 492 ...Posuhova T.V., 1999. Arkhangelsk diamondiferous 500 province. Moscow State University, 521p (in Russian). |  | | Journal (issue) | | Afghan beryls from pegmatites at Ghursalak in Konar Province (aquamarine, morganite) and from the Panjshir...the Nilaw, Mawi and Kurghal regions of Laghman Province from cavities in pegmatite veins (Figure 1). ...Beryl samples from pegmatites of Ghursalak (Konar Province) and Panjshir Valley in NE Afghanistan were provided...of emerald occur in the Panjshir Valley (Kapisa Province). The Nilaw-Kolum Pegmatite Field (35°12' N and...Ghursalak (Gursalak) Pegmatite Field in Konar Province (about 34°57' N and 70°43' to 70°44' E) has yielded |  | | Journal (article/letter/editorial) | | 80 Note: W, Wesselton Mine; RSA; R, Roberts Victor Mine, RSA; L, Louwrencia Mine, Namibia. experiment...diopside is also slower than diffusion of Eu2+ in enstatite at temperatures less than 1200°C. The analogy...that for Al in spinel (Suzuki et al. 2008) and enstatite by approximately one order of magnitude. In addition...Diamond Ridge Temperature (°C) Alss(Opx) Grey Eagle Mine Alss(Opx) Del Puerto Canyon 1000 Alss(Cpx) Burro...Alss(Cpx) Black Diamond Ridge Alss(Cpx) Grey Eagle Mine Alss(Cpx) Del Puerto Canyon 800 Crss(Cpx) Burro |  | Ashchepkov, I.V., Kuligin, S.S., Vladykin, N.V., Downes, H., Vavilov, M.A., Nigmatulina, E.N., Babushkina, S.A., Tychkov, N.S., Khmelnikova, O.S. (2016) Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts. Geoscience Frontiers, 7 (4) 639-662 doi:10.1016/j.gsf.2015.06.004 | Journal (article/letter/editorial) | | in the central part of the Yakutian kimberlite province. This is supported by geophysical mantle profiles...VeKhapchan, VIeBirekte, VIIeXII: AldaneStanovoy province; VIIeOlekma, VIIIeCentral Aldan, IXeEast Aldan...concentrate, as it was determined for kimberlites from Angola (Ashchepkov et al., 2012). The concentrate from...hundred kilometers to the north-west in the Meimecha Province (Arndt et al., 1995; Kogarko and Ryabchikov, 2000)...mantle beneath kimberlite pipes from the Catoca cluster, Angola. Tectonophysics 530e531, 128e151. Ashchepkov |  | | Journal (issue) | | from India • Emerald mining techniques at the Kagem mine, Zambia • Yellow grossular from Tanzania • An unusual...studies of retail colored stone demand, to provide a mine-to-market analysis of corundum over the last quarter...or difficult to interpret, even when coming from mine owners or official government sources. For example...Pakistani side of Kashmir (Kane, 1997, 1998). The mine, situated in extremely remote and rugged mountainous...g (85 ct; Kane, 1997, 1998). It is believed the mine was still operat- GEMS & GEMOLOGY WINTER 2009 |  | Faithfull, John W., , , Dempster, Tim J., MacDonald, John M., Reilly, Monica (2018) Metasomatism and the crystallization of zircon megacrysts in Archaean peridotites from the Lewisian complex, NW Scotland. Contributions to Mineralogy and Petrology, 173 (12) doi:10.1007/s00410-018-1527-5 | Journal (article/letter/editorial) | | granite at 30 kb producing abundant phlogopite and enstatite. The zoned structure of the veins with low variance...Scourie dyke swarm: A long-lived large igneous province with implications for the Paleoproterozoic evolution...metaperidotites: enstatite—magnesite and anthophyllite—magnesite assemblages from the Grenville province. Canad...SHRIMP geochronology of zircon from the Catoca kimberlites, Angola: implications for diamond exploration |  | | Book | | of the eastern margin of the Atlantic (Namibia, Angola) or the western African kimberlites do not fulfil...individual chapters: i) the carbonatitic-alkaline province outcropping on the Kenya-Uganda border which have...Petrogenesis of the volcanic rocks of the Karoo Province edited by ERLANK (1984). In addition, a review...review paper related to this volcanic province appeared in the book devoted to the Flood Basalts Provinces...138 139 142 146 146 5 The Mesozoic Tholeiitic Province of Northwest Africa: A Volcanotectonic Record |  | Ashchepkov, Igor, Medvedev, Nikolay, Vladykin, Nikolay, Ivanov, Alexander, Downes, Hilary (2020) Thermobarometry and Geochemistry of Mantle Xenoliths from Zapolyarnaya Pipe, Upper Muna Field, Yakutia: Implications for Mantle Layering, Interaction with Plume Melts and Diamond Grade. Minerals, 10 (9) 755 doi:10.3390/min10090755 | Journal (article/letter/editorial) | | pipes in the central part of Yakutian kimberlite province (YKP) [1] were exhausted and excavation in open...Rocks of the Kimberlite Formation of the Yakutia Province (in Russian); Institute of Geology of Diamond...Lateral Areals (Example, the Yakutian Diamondiferous Province) (in Russian); ART: Novosibirsk, Russia, 2008;...system MgO-SiO2-Al2 O3 : Solubility of Al2 O3 in enstatite for spinel and garnet peridotite compositions...Calibration and testing of a Cr-in-Cpx barometer and an enstatite-in-Cpx thermometer. Contrib. Mineral. Petrol. |  | Ashchepkov, I.V., Logvinova, A.M., Ntaflos, T., Vladykin, N.V., Kostrovitsky, S.I., Spetsius, Z., Mityukhin, S.I., Prokopyev, S.A., Medvedev, N.S., Downes, H. (2017) Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia?. Geoscience Frontiers, 8 (4) 671-692 doi:10.1016/j.gsf.2016.08.004 | Journal (article/letter/editorial) | | on age of kimberlites from Yakutian kimberlite province. Doklady RI PT Earth sciences RAN 399,95–99...mantle beneath kimberlite pipes from the Catoca cluster, Angola. Tectonophysics 530–531, 128-151. Ashchepkov...Kaapvaal mantle. A study of xenoliths from the Finsch mine, South Africa. Lithos 112, 913–923. ACCEPTED MANUSCRIPT...system MgO–Al2O3–SiO2: solubility of Al2O3 in enstatite for spinel and garnet–spinel compositions. American...Calibration and testing of a Cr-in-Cpx barometer and an enstatite-in-Cpx thermometer. Contributions to Mineralogy |  | Bataleva, Y.V., Palyanov, Y.N., Sokol, A.G., Borzdov, Y.M., Palyanova, G.A. (2012) Conditions for the origin of oxidized carbonate-silicate melts: Implications for mantle metasomatism and diamond formation. Lithos, 128. 113-125 doi:10.1016/j.lithos.2011.10.010 | Journal (article/letter/editorial) | | the analyses of melt phase were natural pyrope, enstatite, diopside, kyanite, rutile, ilmenite and magnesite...compositions and textures of ilmenite in the Catoca kimberlite, Angola, and implications in exploration for diamond |  | | Journal (issue) | | excitement along the chain from the discovery at the mine to the sorting” (M. Semple, pers. comm., 1998)....several localities. Early accounts cite the Kollur mine (and possibly other mines) along the Krishna River...little production at the Indian mines. The Premier mine in South Africa is now considered the most significant...pers. comm., 1998). The Premier Mine. Discovered in 1903, the Premier mine was initially worked by open-pit...England, Thomas Cullinan, then chairman of the Premier mine, presented his wife with a necklace that contained |  | | Journal (issue) | | were dumortierite in quartz, a beautiful green enstatite, and some diamond doublets set in a pin. Two items...The Changma Diamond District, Mengyin, Shandong Province, China Gemstone Carving in China: Winds of Change...Sapphires of Mingxi, Fujian Province, China Summer 1986 The Coscuez Mine: A Major Source of Colombian...Occurrence and Gemological Properties of Wessels Mine Sugilite Three Notable Fancy-Color Diamonds The...vie for Angola diamond rights. Several companies are negotiating with the government of Angola for rights |
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