 | | Journal (article/letter/editorial) | | Neoproterozoic ‘anomalous’ kimberlites of Guaniamo, Venezuela: mica kimberlites of ‘isotopic transitional’...Columbia, Canada V7S 3J1 Guaniamo Mining Company, Centro Gerencial Mohedano, Office 9D, La Castellana, Caracas...Caracas, Venezuela Received 27 June 2003; accepted 17 February 2004 Available online 17 July 2004 Abstract...Abstract In Venezuela, kimberlites have so far only been found in the Guaniamo region, where they occur as...emplacement age of the Guaniamo kimberlites is 712 F 6 Ma, i.e., Neoproterozoic. The Guaniamo kimberlites contain |  | | Journal (article/letter/editorial) | | pyrochlore-group minerals from the Guaniamo kimberlites, Venezuela Victor V. Sharygin a,⁎, Nikolai V....Novosibirsk, Russia Guaniamo Mining Company, Centro Gerencial Mohedano, Office 9D, La Castellana, Caracas...Caracas, Venezuela a r t i c l e i n f o Article history: Received 23 September 2008 Accepted 28 March...Keywords: Pyrochlore Betafite Perovskite Kimberlite Carbonatite Venezuela a b s t r a c t Oscillatory-zoned...minerals are found in the La Ceniza diamondiferous kimberlites, Guaniamo region, Venezuela. This is the first |  | Sobolev, N. V., Schertl, H.-P., Valley, J. W., Page, F. Z., Kita, N. T., Spicuzza, M. J., Neuser, R. D., Logvinova, A. M. (2011) Oxygen isotope variations of garnets and clinopyroxenes in a layered diamondiferous calcsilicate rock from Kokchetav Massif, Kazakhstan: a window into the geochemical nature of deeply subducted UHPM rocks. Contributions to Mineralogy and Petrology, 162 (5) 1079-1092 doi:10.1007/s00410-011-0641-4 | Journal (article/letter/editorial) | | Abstract Calcsilicate and garnet-pyroxene rocks with dolomite and Mg-calcite matrices occur with UHPM diamondiferous...by biotite gneisses (85 vol.%) with subordinate dolomite marbles (calcsilicate) and garnet-pyroxene rocks...are layered and include different lithologies. Dolomite-rich and calcite-rich layers, with minor amounts...detected in very rare Mg–Ca garnet relics within dolomite-rich layers. Those garnets generally were found... However, more than 80% of garnet grains from dolomite-rich layers completely lack luminescence. The |  | | Journal (article/letter/editorial) | | No. 1-2, 2003 Lead isotopic systematics of major river sediments: a new estimate of the Pb isotopic composition...Stoichiometry effect on stable isotope analysis of dolomite— Tzen-Fu Yui and Shou-Yeh Gong CONTRIBUTIONS...peridotitic garnet xenocrysts from the La Ceniza kimberlite, Guaniamo, Venezuela —Daniel J. Schulze, John W. Valley...Savelli 671 717 Vol. 63, No. 1, 2003 Discovery of Kimberlite pipes in Gadwal Area, Mahbubnagar district, Andhra...geochronology of regional volcanism hosting the Bajo de la Alumbrera Cu-Au deposit: implications for porphyry-related |  | | Journal (article/letter/editorial) | | peridotitic diamonds sampled by the Roberts Victor kimberlite tapped locally distinct mantle sources of carbon...the main Orapa kimberlite. Diamonds and xenoliths from the mine at the Orapa kimberlite have been extensively...4 5 6 18O /‰ 8 9 10 11 8 9 10 11 /‰ Guaniamo Schulze et al. 2003, 2004 2 3 7 18O Finsch...garnet inclusions in diamond from the Finsch kimberlite. (F) Oxygen isotope ratios of garnet and coesite...coesite inclusions in diamond from Guaniamo. Solid tie lines between two garnets link multiple analyses |
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