 | Kaminsky, F. V., Zakharchenko, O. D., Griffin, W. L., Channer, D. M. DeR., Khachatryan-Blinova, G. K. (2000) DIAMOND FROM THE GUANIAMO AREA, VENEZUELA. The Canadian Mineralogist, 38 (6) 1347-1370 doi:10.2113/gscanmin.38.6.1347 | Journal (article/letter/editorial) | | 1347-1370 (2000) DIAMOND FROM THE GUANIAMO AREA, VENEZUELA* FELIX V. KAMINSKY§ KM Diamond Exploration Ltd... NSW 2109, Australia DOMINIC M. DeR. CHANNER Guaniamo Mining Company, Centro Gerencial Mohedano, Cruce...Cruce Av. Mohedano, Urb. La Castellana, Caracas, Venezuela GALINA K. KHACHATRYAN-BLINOVA Institute of Diamonds...5,000 diamond crystals (or fragments) from kimberlite sills and placer deposits in the Guaniamo area of...of Venezuela have been characterized in terms of morphology, internal structure, carbon isotopic composition |  | | Journal (article/letter/editorial) | | western Guyana Shield, Venezuela: Evidence from diamonds and xenocrysts in Guaniamo kimberlites Daniel J...V8W 3P6 c Guaniamo Mining Company, Centro Gerencial Mohedano, La Castellana, Caracas, Venezuela d KM Diamond...Abstract Mantle xenoliths and xenocrysts from Guaniamo, Venezuela kimberlites record equilibration conditions...Meso-proterozoic Cuchivero Province (host to the Guaniamo kimberlites) is underlain by depleted and ultra-depleted...abundant Guaniamo eclogite-suite diamonds that have ocean-floor geochemical signatures. Although diamond-indicative |  | | Journal (article/letter/editorial) | | paired pattern of radiohaloes on a diamond crystal from Guaniamo (Venezuela) Daniel J. Schulze, Lutz Nasdala...paired pattern of radiohaloes on a diamond crystal from Guaniamo (Venezuela), LITHOS (2016), doi:10.1016/j...radiohaloes on a diamond a NU MA Daniel J. Schulze a, Lutz Nasdala b,* SC crystal from Guaniamo (Venezuela)...nasdala@univie.ac.at (L. Nasdala). Keywords: Diamond Radiation damage Radiocolouration Raman spectroscopy...2 ABSTRACT T An octahedral diamond crystal from Guaniamo, Venezuela, shows a multitude of round RI |  | Schulze, Daniel J., Valley, John W., Spicuzza, Michael J., Channer, Dominic M. DeR. (2003) Oxygen Isotope Composition of Eclogitic and Peridotitic Garnet Xenocrysts from the La Ceniza Kimberlite, Guaniamo, Venezuela. International Geology Review, 45 (11) 968-975 doi:10.2747/0020-6814.45.11.968 | Journal (article/letter/editorial) | | Xenocrysts from the La Ceniza Kimberlite, Guaniamo, Venezuela Daniel J. Schulze , John W. Valley , Michael...Xenocrysts from the La Ceniza Kimberlite, Guaniamo, Venezuela, International Geology Review, 45:11, 968-975...Xenocrysts from the La Ceniza Kimberlite, Guaniamo, Venezuela DANIEL J. SCHULZE,1 Department of Geology...CHANNER Guaniamo Mining Company, Centro Gerencial Mohedano, 9D Urb. La Castellana, Caracas, Venezuela Abstract...Although diamonds from kimberlites in the Guaniamo region of Venezuela overwhelmingly belong to the eclogite |  | Kaminsky, F. V., Zakharchenko, O. D., Khachatryan, G. K., Griffin, W. L., Channer, D. M. DeR. (2006) DIAMOND FROM THE LOS COQUITOS AREA, BOLIVAR STATE, VENEZUELA. The Canadian Mineralogist, 44 (2) 323-340 doi:10.2113/gscanmin.44.2.323 | Journal (article/letter/editorial) | | pp. 323-340 (2006) DIAMOND FROM THE LOS COQUITOS AREA, BOLIVAR STATE, VENEZUELA Felix V. KAMINSKY§,...Olga D. ZAKHARCHENKO and Galina K. KHACHATRYAN KM Diamond Exploration Ltd., 2446 Shadbolt Lane, West Vancouver... NSW 2113, Australia Dominic M. DeR. CHANNER Guaniamo Mining Company, Centro Gerencial Mohedano, Office...Caracas, Venezuela Abstract A set of 77 diamond crystals from the Los Coquitos placer on the Guaniamo River...State, Venezuela, has been comprehensively studied and compared to previously studied diamond from the |  | | Journal (article/letter/editorial) | | Neoproterozoic ‘anomalous’ kimberlites of Guaniamo, Venezuela: mica kimberlites of ‘isotopic transitional’...Sablukova a, Dominic M.DeR. Channer b a b KM Diamond Exploration Ltd., 2446 Shadbolt Lane, West Vancouver...Vancouver, British Columbia, Canada V7S 3J1 Guaniamo Mining Company, Centro Gerencial Mohedano, Office 9D...9D, La Castellana, Caracas, Venezuela Received 27 June 2003; accepted 17 February 2004 Available online...2004 Abstract In Venezuela, kimberlites have so far only been found in the Guaniamo region, where they |  | | Journal (article/letter/editorial) | | 361 ZINCOCHROMITE FROM THE GUANIAMO RIVER DIAMONDIFEROUS PLACERS, VENEZUELA: EVIDENCE OF ITS METASOMATIC...Grande placer deposit in the Guaniamo River diamondiferous district, Venezuela. It occurs in subhedral to...formula of the zincochromite richest in Zn from Guaniamo can be written: (Zn6.499Fe2+0.613Mn2+0.511Mg0...worldwide scale, the occurrence of zincochromite at Guaniamo points to its use as a mineral indicator of kimberlites...concentrates, kimberlites, lamproites, Guaniamo, Quebrada Grande placer, Venezuela. Sommaire La zincochromite associée |  | | Journal (article/letter/editorial) | | subduction and crust–mantle mixing from a single diamond Daniel J. Schulze a,*, Ben Harte b, John W. Valley...USA d Guaniamo Mining Company, Centro Gerencial Mohedano, 9D Urb. La Castellana, Caracas, Venezuela Received...sections of a diamond from the Guaniamo region of Venezuela suggests a history of the diamond involving two...location in the stone. An early-formed garnet in the diamond core has higher Ca/(Ca + Mg) and lower Mg/(Mg +...later garnets associated with the second period of diamond growth. This variation conforms to an extensive |  | | Journal (article/letter/editorial) | | primarysourceof alluvialdiamondsin the GuyanaShieldof Venezuela,Guyana,and Brazilhasbeenthe subjectof controversy...diamonds in the Guyana Shieldis responsiblefor the diamond-bearing alluvialdepositsin the Guaniamodistrictof...1985), andthusdiamondsin alluvialdeposits (e.g., Venezuela,Russia,Brazil, and Australia)will reflectthisorigin...the RoraimaGroup, Venezuela(Meyer and Boyd,1968, 197œ),andthe Guaniamo region,Venezuela (Baptistaand Svisero...worldwide localities. Alluvial dia- monds,whether in Venezuela or elsewhere,will ini- tially havereachedthe |  | | | | 193–200 Diffusion in diamond. I. Carbon isotope mapping of natural diamond J. A. CRAVEN1, B. HARTE1...whole of a polished plate of a natural diamond from Guaniamo, Venezuela. The resultant map of C isotope variation...cathodoluminescence image of the growth structure of the diamond and, therefore, indicates an extremely limited...scale of diffusion of C atoms since the time of diamond formation. This result is compatible with the limited...state of the diamond. Inclusions in the diamond are eclogitic, in common with many Guaniamo diamonds with |  | | Journal (article/letter/editorial) | | pyrochlore-group minerals from the Guaniamo kimberlites, Venezuela Victor V. Sharygin a,⁎, Nikolai V....Sciences, Koptyuga pr. 3, 630090 Novosibirsk, Russia Guaniamo Mining Company, Centro Gerencial Mohedano, Office...Office 9D, La Castellana, Caracas, Venezuela a r t i c l e i n f o Article history: Received 23 September...Pyrochlore Betafite Perovskite Kimberlite Carbonatite Venezuela a b s t r a c t Oscillatory-zoned crystals of...La Ceniza diamondiferous kimberlites, Guaniamo region, Venezuela. This is the first known occurrence of |  | | Journal (article/letter/editorial) | | IMPURITIES IN DIAMOND, AS REVEALED BY INFRARED ABSORPTION DATA FELIX V. KAMINSKY§ KM Diamond Exploration...Litovskii Boulevard, Moscow, 117593, Russia ABSTRACT Diamond crystals from Siberian, Arkhangelsk, South African...state of nitrogen aggregation were established in diamond crystals from different areas and deposits. On...low-nitrogen, highly-aggregated-nitrogen diamond, (2) intermediate diamond crystals, and (3) high-nitrogen, ...poorly-aggregated-nitrogen diamond (occasionally with high concentrations of hydrogen and “platelets”) |  | | Journal (article/letter/editorial) | | metasomatic origin in kimberlitic rocks from Venezuela PETER H. NIXON AND ERIC CONDLIFFE Department of...Precambrian kimberlitic sill in the Guaniamo District of Bolivar Province, Venezuela. The paragenesis is similar...spinel. In the Venezuela rocks the spinels are of the type occurring both as diamond inclusions and as...as a component of diamond-related Cr-rich garnet harzburgite mantle xenoliths. Yimengite contains significant...metasomatism generated by K- and Ba-rich fluids. In Venezuela, metasomatism of this type would appear to be |  | | Journal (article/letter/editorial) | | early 18th century and that Brazil was the main diamond producer in the world until 1870, the knowledge...Tompkins, 1994). These discoveries show that primary diamond sources exist in Brazil, but so far their small...placer deposits, and perhaps additional primary diamond deposits may be found in Brazil. If they exist...inclusions. Considering the extent of alluvial diamond sources in Brazil, previous studies of this type...Brazil have been published. One exception is the diamond suite from the Juina area, which includes the original |  | | Journal (article/letter/editorial) | | kimberlite/diamond indicator mineral F.V. Kaminsky a,*, E.A. Belousova b a b KM Diamond Exploration...0.63–2.49 wt.% (up to 11 wt.% in inclusions in diamond) and an elevated vanadium admixture (V2O3 = 0.21–0...composition, Mn-ilmenite megacrysts and inclusions in diamond are almost identical. The concentrations of trace...included in diamond. This confirms that Mn-ilmenite in kimberlites is genetically related to diamond. The finds...ilmenite may be considered as another kimberlite/diamond indicator mineral. © 2009, IGM, Siberian Branch |  | | Journal (article/letter/editorial) | | Mantle geochemistry Rodinia breakup Brazilian diamond sources a b s t r a c t The diamondiferous Brauna...older “anomalous” mica kimberlites from Guaniamo in Venezuela (712 ± 6 Ma). This may suggest that both...Earth's inner structure and composition. Although diamond-rich sediments of Phanerozoic and Precambrian age...America since the 19th century, there is hitherto no diamond production from primary kimberlite and/or lamproite...South America, with the 712 ± 6 Ma Guaniamo kimberlite in Venezuela being one of the best investigated |  | Rege, S., Griffin, W.L., Pearson, N.J., Araujo, D., Zedgenizov, D., O'Reilly, S.Y. (2010) Trace-element patterns of fibrous and monocrystalline diamonds: Insights into mantle fluids. Lithos, 118 (3) 313-337 doi:10.1016/j.lithos.2010.05.007 | Journal (article/letter/editorial) | | Keywords: Fibrous diamonds Diamond paragenesis Diamond trace elements Mantle fluids Diamond origin a b s t r a...metasomatised rocks. However, fluids trapped in diamond offer another and more direct approach to understanding...consensus that diamond formation in the SCLM involves fluid transport, making diamond deposition part...of metasomatic processes. Detailed studies of diamond-bearing xenoliths, especially eclogites, show that...growth of the diamond. The small size of the inclusions, coupled with the high strength of diamond, has allowed |  | Sobolev, Nikolai V., Sobolev, Vladimir N., Snyder, Gregory A., Yefimova, Emiliya S., Taylor, Lawrence A. (1999) Significance of Eclogitic and Related Parageneses of Natural Diamonds. International Geology Review, 41 (2) 129-140 doi:10.1080/00206819909465135 | Journal (article/letter/editorial) | | suite in diamonds, and was detected in about 15 diamond occurrences worldwide. It rep resents from 15%...composition of the mantle environment appropriate to the diamond P-T stability field is different from the composition...dominates over the eclogitic (Etype) environment for diamond formation (Meyer and Boyd, 1972; Sobolev, 1974;...paragenetic varia tions also is typical for several diamond occur rences characterized by E-type diamonds...from Argyle, West Australia; Guaniamo, Venezuela; and alluvial diamond occurrences of the Urals and the |  | | Journal (article/letter/editorial) | | 2010 Available online 28 April 2010 Keywords: Diamond Kimberlite Eclogite Lithosphere Trace elements...In order to further investigate the protolith/diamond relationship, garnets and (in some cases) clinopyroxene...156–168 157 It is likely that prior to and during diamond crystallisation, the major and particularly the...inclusions record conditions of protolith evolution and diamond crystallisation up to the time of encapsulation...later metasomatic modification of the high-pressure diamond host rock by transiting melts, fluids, and the carrier |  | Pokhilenko, N.P., Sobolev, N.V., Reutsky, V.N., Hall, A.E., Taylor, L.A. (2004) Crystalline inclusions and C isotope ratios in diamonds from the Snap Lake/King Lake kimberlite dyke system: evidence of ultradeep and enriched lithospheric mantle. Lithos, 77 (1) 57-67 doi:10.1016/j.lithos.2004.04.019 | Journal (article/letter/editorial) | | subducted C of crustal origin in the processes of the diamond formation. The presence of subcalcic Cr-rich majorite...ore-bodies it represents a new type of large primary diamond deposits (Pokhilenko et al., 1998, 2000). The age...recovered for analysis after burning of their host diamond crystals, but more than 20 diamonds were polished...precision of d13C < 0.2x. Methods and techniques of diamond crystal preparation were described in detail previously...with up to five separate inclusions in a single diamond, and in 25 diamonds olivine coexist with other |  | Sobolev, Nikolai V., Logvinova, Alla M., Zedgenizov, Dmitry A., Pokhilenko, Nikolai P., Kuzmin, Dmitry V., Sobolev, Alexander (2008) Olivine inclusions in Siberian diamonds: high-precision approach to minor elements. European Journal of Mineralogy, 20 (3) 305-315 doi:10.1127/0935-1221/2008/0020-1829 | Journal (article/letter/editorial) | | two main types of geological environment support diamond formation: they are ultramafic (or peridotitic)...peridotites and eclogites in kimberlites. In primary, diamond-bearing kimberlite and lamproite rocks the ratio...diamonds dominate in the overwhelming majority of diamond occurrences worldwide. Olivine is the most typical...for analysis on a single polished surface with diamond. Olivine from diamonds of the Snap Lake dyke system...grain of such composition located in the inner diamond growth zone is associated with an olivine grain |  | | Journal (article/letter/editorial) | | Stable Isotopes and the Origin of Diamond Pierre Cartigny 1 M ost diamonds form in a relatively narrow...150 and 250 km. From carbon isotope analyses of diamond obtained in the 1970s, it was first proposed that...which represent subducted oceanic crust. KEYWORDS: diamond, stable isotopes, INTRODUCTION Natural diamonds...pick up diamond, but also ascend to the surface fast enough to prevent transformation of diamond to graphite...its dissolution in the magma. The occurrence of diamond on the Earth’s surface is thus both accidental |  | | Journal (article/letter/editorial) | | disaggregated xenoliths (Logvinova et al., 2003). Diamond-Associated Chromites and Chrome Spinels from Granular...kimberlites and lamproites and in estimation of their diamond potential (Sobolev, 1971; Sobolev et al., 1975)...several inclusions of chrome spinels occur in one diamond, they may have different proportions of FeO, MgO...impressive example is the “inclusion-overloaded” diamond Ud-34 from the Udachnaya kimberlite pipe (Sobolev...inclusions of chrome spinels were extracted from this diamond and analyzed along with olivine inclusions, one |  | | Journal (article/letter/editorial) | | journal homepage: www.elsevier.com/locate/lithos Diamond Special Issue Preface “The nature of diamonds...mark the occasion of the second International Diamond School (IDS) held in January 2015 at Bressanone...appropriate to publish a special issue of Lithos on diamond research entitled “The nature of diamonds and their...and young scientists to meet, learn and discuss diamond research with some of the most eminent international...an overview of the most advanced frontiers in diamond research, with the aim of demonstrating how diamonds |  | Russell, Ashley K., Kitajima, Kouki, Strickland, Ariel, Medaris, L. Gordon, Schulze, Daniel J., Valley, John W. (2013) Eclogite-facies fluid infiltration: constraints from δ18O zoning in garnet. Contributions to Mineralogy and Petrology, 165 (1) 103-116 doi:10.1007/s00410-012-0794-9 | Journal (article/letter/editorial) | | xenocrysts from the La Ceniza kimberlite (Guaniamo Region, Venezuela). Among Roberts Victor xenoliths, this...coesite inclusions in diamond (Schulze et al. 2003a), and low d13C values of diamond (Kaminsky et al. 2000)...evidence for the involvement of recycled sediments in diamond formation. Nature 353:649–653 Farquhar J, Wing...(2002) Mass-independent sulfur of inclusions in diamond and sulfur recycling on early Earth. Science 298:2369–2372...Khachatrayan-Blinova GK (2000) Diamond from the Guaniamo area, Venezuela. Can Mineral 38:1347–1370 Kaminsky |
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Guaniamo, Bolívar, Venezuela