 | Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 | Journal (article/letter/editorial) | | of metamorphic belts (since the Precambrian) and alkali basalts (from the Cenozoic to the Quaternary)....of formation: (Type I) magmatic-related and (Type II) metamorphic-related. Type I is characterized by...(sometimes magmatic) origin are hosted by alkali basalts (Madagascar and others), and Type IB corresponding...in kimberlite (Democratic Republic of Congo). Type II also has two sub-types; metamorphic deposits sensu...rubies from the recently discovered Didy mine in Madagascar also command high prices [19]. A set of eight |  | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, ThĆ©ogĆØne, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3 | Journal (article/letter/editorial) | | isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin Gaston...dāAntananarivo, Ambohitsaina, BP 906, Antananarivo 101, Madagascar Y. Offant Cerege, Europole MĆ©diterranĆ©en de lāArbois...Ambaranjana Antanimora, Antananarivo 101, Madagascar ces in Madagascar to provide a gemstone geological identification...corundum deposits in Madagascar are hosted in magmatic (syenite and alkali basalt) and metamorphic rocks...pyroxenitic xenoliths contained in the alkali basalt of Soamiakatra have Ī“18O values ranging between 1.3 |  | | Book | | subdivided into alkali basalts (IA) and kimberlite (IB) hosts. Metamorphic rocks (Type II) are subdivided...Sedimentary, detrital, category (Type III) includes alkali basalt and kimberlite sources (IIIA) and metamorphic...Tanzania; Andilamena/Zahmena and Ampanihy/Toliara, Madagascar. Marble-ruby types included various deposits...sapphire deposits included Andilamena and Andrebabe, Madagascar; various Mogo Gem Tract sites, Myanmar; Elahera...Namehaca, Mozambique and Ampanihy and Zahmena, Madagascar. In contrast, Appaluttoq ruby, Greenland, 4 |  | | Journal (article/letter/editorial) | | UK Keywords France . French Massif Central . Basalt . Oxygen isotopes . Sapphires G. Pegere Avenue...East African rift (Krzemnicki et al. 1996), in Madagascar (Schwarz et al. 2000; Giuliani et al. 2007a)...xenocrysts that have been transported to the surface by alkali basalts (Coenraads et al. 1990; Guo et al. 1996;...Margeride granite (Fig. 1). The volcanics rocks are alkali basalts and basanites containing peridotite, pyroxenite...2000). Primary occurrences of sapphires in the alkali basalts are very rare. Xenoliths of blue-sapphire-bearing |  | Garnier, V., Ohnenstetter, D., Giuliani, G., Fallick, A. E., Phan Trong, T., HoĆ ng Quang, V., Pham Van, L., Schwarz, D. (2005) Basalt petrology, zircon ages and sapphire genesis from Dak Nong, southern Vietnam. Mineralogical Magazine, 69 (1) 21-38 doi:10.1180/0026461056910233 | Journal (article/letter/editorial) | | Magazine, February 2005, Vol. 69(1), pp. 21Ā±38 Basalt petrology, zircon ages and sapphire genesis from...basaltic fields of the Dak Lak Province. Two distinct basalt suites are recognized in this field: a tholeiitic...6.0 to 6.9 and are not in equilibrium with the alkali basalts which 18 have O values between 5.0 and...evolved melts issued from the fractionation of alkali basaltic magmas contaminated with lower crustal... Ćæ d K EY WORDS : Ćæ % % Ćæ Ćæ sapphire, basalt, petrography, geochemistry, zircon, U-Pb dating |  | Voudouris, Panagiotis, Mavrogonatos, Constantinos, Graham, Ian, Giuliani, Gaston, Melfos, Vasilios, Karampelas, Stefanos, Karantoni, Vilelmini, Wang, Kandy, Tarantola, Alexandre, Zaw, Khin, Meffre, Sebastien, Klemme, Stephan, Berndt, Jasper, Heidrich, Stefanie, Zaccarini, Federica, Fallick, Anthony, Tsortanidis, Maria, Lampridis, Andreas (2019) Gem Corundum Deposits of Greece: Geology, Mineralogy and Genesis. Minerals, 9 (1) 49 doi:10.3390/min9010049 | Journal (article/letter/editorial) | | the Cenozoic continental rifting with related alkali basalt volcanism (65ā1 Ma) [2,4ā10]. Magmatic and metamorphic...the Pan-African orogeny are present in southern Madagascar, East Africa, South India and Sri Lanka; those...Southeast Asia. Alkali basalt-related sapphires occur in Australia, northern and central Madagascar, Nigeria...diaspore; 420 to 500 ā¦ C (appearance of biotite) for zone II; 500 ā¦ C to 540ā580 ā¦ C (disappearance of chloritoid)...metamorphism; (ii) syn-metamorphism depletion in O related to hydration subduction and metamorphism; (ii) syn-metamorphism |  | Graham, Ian, Sutherland, Lin, Zaw, Khin, Nechaev, Victor, Khanchuk, Alexander (2008) Advances in our understanding of the gem corundum deposits of the West Pacific continental margins intraplate basaltic fields. Ore Geology Reviews, 34 (1) 200-215 doi:10.1016/j.oregeorev.2008.04.006 | Journal (article/letter/editorial) | | April 2008 Available online 3 June 2008 Keywords: Basalt Sapphire Ruby Zircon Continental margins West Paciļ¬c...techniques have greatly increased our knowledge of the basalt-derived gem sapphireārubyāzircon deposits. In this...Mesozoic-Cenozoic (mostly Cenozoic) intraplate basalt ļ¬elds (Oakes et al., 1996; Sutherland, 1996; Fig...gem-quality sapphires downstream from 46ā47 Ma alkali basalts in the Weldborough area (McGee, 2005; Zaw...The Tumbarumba ļ¬eld within the Snowy Mountains basalt province of southern NSW (Fig. 3) is spatially |  | | Journal (issue) | | had to go on. GEMS & GEMOLOGY WINTER 2019 Madagascar are from metamorphic deposits, but the deposits...Ambondromifehy are formed in alkali basaltsātwo very different deposits, yet both from Madagascar. As stated earlier...ring, courtesy of Ronald Ringsrud; a 7.04 ct Madagascar sapphire, courtesy of Mayer & Watt; and an exceptional...metamorphic. Magmatic deposits include gem corundum in alkali basalts as in eastern Australia, and sapphire in...sapphires are produced from gem placers related to alkali basalts, as in eastern Australia or southern Vietnam |  | | Book | | VietnamāPotential Source and Links to Cenozoic Alkali Basalts Reprinted from: Minerals 2019, 9, 89, doi:10...(Itabira), Colombia (Coscuez), Ethiopia (Shakisso), Madagascar (Mananjary), Russia (Ural mountains), Zambia...Piilonen et al. [29] on zircon xenocrysts from alkali basalts in Ratanakiri Province (Cambodia) suggest...VietnamāPotential Source and Links to Cenozoic Alkali Basalts. Minerals 2019, 9, 89. [CrossRef] Dill...I: muscovite, tourmaline, albite, and quartz; Zone II: K-feldspar (microcline), quartz, and albite; Zone |  | | Journal (article/letter/editorial) | | texture Column Agpaite Alaskite Albitite Alkali basalt Alnoite Feldspathoid-bearing igneous rocks...quartz as accessory minerals. Silica-undersaturated basalt with normative nepheline, diopside and olivine... Is a maļ¬c igneous rock equivalent to volcanic basalt, normally with a visible texture of euhedral lath...quartz below 5% and a plagioclase/(plagioclase + alkali feldspar) N 90. Plagioclase b An50. Duricrusts...intrusive igneous rock chemically equivalent to basalt. Gneiss medium to coarse foliated and largely recrystallized | | | Journal (article/letter/editorial) | | texture Column Agpaite Alaskite Albitite Alkali basalt Alnoite Feldspathoid-bearing igneous rocks...quartz as accessory minerals. Silica-undersaturated basalt with normative nepheline, diopside and olivine... Is a maļ¬c igneous rock equivalent to volcanic basalt, normally with a visible texture of euhedral lath...quartz below 5% and a plagioclase/(plagioclase + alkali feldspar) N 90. Plagioclase b An50. Duricrusts...intrusive igneous rock chemically equivalent to basalt. Gneiss medium to coarse foliated and largely recrystallized |
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