 | | Journal (article/letter/editorial) | | sapphire-zircon-magnetite xenolith from the Chanthaburi Gem Province, Thailand ROBERTR. COENRAADS The Gemmological Association...Mineral Resources, Rama 6 Road, Bangkok 10400, Thailand AND F. [.IN SUTHERLAND Division of Earth and...magnetite-bearing xenolith from Khao Wua, near Chanthaburi in Thailand, conclusively demonstrates a common origin for...0.44 to 3.0 Ma for the alkali basaltic volcanism in the Chanthaburi Province, These data suggest a common...magnetite, and link them with the processes involved in alkali basaltic magma generation. The high iron and zirconium |  | | Journal (article/letter/editorial) | | Road, Khlong Toey Nua, Watthana, Bangkok 10110, Thailand *Corresponding author, e-mail: seriwat@hotmail...and coexisting minerals of gem corundum from the Thailand area analysed by SEM-EDS in this study can be...and ruby suites. The sapphire suite includes alkali feldspar (sanidine), nepheline, zircon, hercynite-spinel...chemistry, SEM-EDS, corundum, ruby, sapphire, Thailand, origin. 1. Introduction Sutherland et al. (1998a)...conditions of the genesis of the host ruby from eastern Thailand. Garland et al. (2001) in a study of Montana sapphires |  | Peucat, J.J., Ruffault, P., Fritsch, E., Bouhnik-Le Coz, M., Simonet, C., Lasnier, B. (2007) Ga/Mg ratio as a new geochemical tool to differentiate magmatic from metamorphic blue sapphires. Lithos, 98 (1) 261-274 doi:10.1016/j.lithos.2007.05.001 | Journal (article/letter/editorial) | | blue sapphires. Magmatic blue sapphires found in alkali basalts (e.g. southeastern Asia, China, Africa)...in various rock-types and are commonly found in alkali basalts, in plutonic rocks ⁎ Corresponding author...as xenocrysts found in alkali basalts and (2) magmatic sapphires formed in alkali Table 1 Instrumental...also reported. 4.1. Magmatic sapphires related to alkali basalts The sapphires studied here come from deposits...(1998a) and Saminpanya et al. (2003) showed that alkali basalts can contain two types of xenocryts: magmatic |  | | Journal (issue) | | composed of ruby crystals in a transparent matrix of feldspar were briefly described by Koivula et al. (1994)...purchased by a German gem merchant in northern Thailand and were said to originate from Myanmar by local...local dealers. During further trips to Thailand, our supplier was able to obtain some similar cabochons...x. • colourless to whitish matrix: plagioclase feldspar Chemical compositions The matrix consists of...transparent, colourless to light grey plagioclase feldspar. Microprobe analyses (Table I) showed that plagioclase |  | Piilonen, Paula, Sutherland, F., Danišík, Martin, Poirier, Glenn, Valley, John, Rowe, Ralph (2018) Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle. Minerals, 8 (12) 556 doi:10.3390/min8120556 | Journal (article/letter/editorial) | | Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Article Southeastfrom Asia—Trace ElementBasalts...(U-Th)/He the Ratanakiri Volcanic Composition, Province (Cambodia), Geochronology—Revelations intoO-Hf...Abstract: Zircon xenocrysts from alkali basalts in Ratanakiri Province, Cambodia represent a unique low-Hf...and red Abstract: Zircon xenocrysts alkali basalts Ratanakiri Province, Cambodia represent a unique low-Hf...Keywords: zircon; xenocryst; alkali basalt; Ratanakiri Volcanic Province; trace elements; O-isotopes and |  | 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) | | rutile, some contain additional nepheline and K-feldspar, suggesting crystallization from more undersaturated...gem-quality sapphires downstream from 46–47 Ma alkali basalts in the Weldborough area (McGee, 2005; Zaw...Tumbarumba field within the Snowy Mountains basalt province of southern NSW (Fig. 3) is spatially associated...2005a and unpublished data). Olivine tholeiite, alkali basalt and basanite flows, some with mantle peridotite...form a southeastern part of the Walcha Volcanic Province (Duggan, 1989) and are dated between 45 and 75 |  | | Journal (article/letter/editorial) | | titaniferous columbite and uranpyrochlore), alkali feldspar, low-Ca plagioclase (albiteoligoclase) and...mixed paragenesis (“ hybrid rock hypothesis ”). Feldspar exsolution textures provide strong evidence that...terrains sparsely distributed in eastern Australia, Thailand and eastern China. The lack of understanding of...China, the Indochina region of southeastern Asia (Thailand, Vietnam and Cambodia) and northern Africa (Kenya...corundum crystals in basalts of the Hoy Volcanic Province in central Queensland, Australia. At two localities |  | Baldwin, L. C., Tomaschek, F., Ballhaus, C., Gerdes, A., Fonseca, R. O. C., Wirth, R., Geisler, T., Nagel, T. (2017) Petrogenesis of alkaline basalt-hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany. Contributions to Mineralogy and Petrology, 172 (6) doi:10.1007/s00410-017-1362-0 | Journal (article/letter/editorial) | | Uher et al. 2012). The problem is that primitive alkali basalts are not corundum-normative when they leave...CO2 rich syenitic magmas led to the formation of alkali– carbonate complexes, so that the residual melt...sapphire xenocrysts that occur within primitive alkali basalts and basanites from the Siebengebirge Volcanic...sapphires from the SVF are found in situ within alkali basalt, a relatively rare occurrence with the potential...(SVF) is part of the Central European Volcanic Province (CEVP). The latter forms a 200–300 km broad Cenozoic |  | | Journal (issue) | | have been known to produce district of the Northern Rift Valley Province, and corundum in all possible... is located in the Turkana district of the Northern Rift Valley Province on the west side of Lake Turkana...ultra-basic rocks into mica-schists: KAlSi308l (K-feldspar) + Mg6Si4O10t:OH)8 (serpentine) = KMg3ISi3A10iJ(F5...horizontal levels as well as in KlAlSi3Oj (K-feldspar) + Mg3ISi401(J(OH)2 (talc) = KMg3lSi3A101(J(F...of a feldspar inclusion (a), and of two mica crystals (b) in a Carnaiba emerald (Wt%). (a) Feldspar FeO |  | | Journal (issue) | | occur in the John Saul ruby mine, Taita-Taveta District, Kenya (Simonet, 2000) which is located just north...of four green tourmalines from the Taita-Taveta District, Kenya. For the present study, the contents of...2000. Geology of the Yellow Mine (TaitaTaveta District, Kenya) and other yellow tourmaline deposits in...for basalt-related sapphires from Bo Phloi, Kanchanaburi, Thailand, New South Wales, Australia, and ChangLe...basaltrelated origin (e.g. from Australia, China or Thailand) and non-basalt-related origin (e.g. from Sri |  | | Journal (issue) | | Malipo, China Inclusions in Corundum from Bo Welu, Thailand Fall 2019 VOLUME 55, No. 3 EDITORIAL 293...in Ruby and Sapphire from the Bo Welu Gem Deposit in Chanthaburi, Thailand Supparat Promwongnan and Chakkaphan...and Color of Cultured Half-Pearls from Phuket, Thailand Kannika Kanjanachatree, Napapit Limsathapornkul...Sturman London, UK Manama, Bahrain Bangkok, Thailand John L. Emmett Lore Kiefert Fanus Viljoen ...analysis of emeralds from Malipo County in Yunnan Province of southwestern China. Among notable deposits |  | | Journal (article/letter/editorial) | | regions have similar compositions. Quartz, mica and feldspar minerals, to mainly highly stablecomposition,...high-pressure nappe system. They consist of K-feldspar, quartz, plagioclase, muscovite, garnet, tourmaline...165 (2019) GEM-QUALITY BLACK SPINEL FROM BO PHLOI, THAILAND Kruzslicz, Á.B.1, Nasdala, L.1, Wildner,...Srinakharinwirot University, 114 Sukhumvit 23, Bangkok 10110, Thailand e-mail: lutz.nasdala@univie.ac.at 1 2 Since...corundum production in the Kanchanaburi and Bo Phloi mining fields, western Thailand, local gem cutters have |  | | Report (issue) | | Holocene in age (Fig. 2). The lavas all appear to be alkali olivine basalts. 4. Kilchu-Myéngch’on. In this...(IAVCEI, 1973). The cone is truncated and composed of alkali olivine basalt. Lu and others (1981) stated that...upward the lavas consist of basanites, olivine alkali basalts, and olivine tholeiites. Abundant inclusions... Distribution of volcanic features in Longwan district (listing 6) of Manchuria. Modified after Ogura...northwest of the lake there is a flow of olivine-rich alkali basalt 100 km long that flowed along a canyon. |  | Sutherland, Lin, Graham, Ian, Yaxley, Gregory, Armstrong, Richard, Giuliani, Gaston, Hoskin, Paul, Nechaev, Victor, Woodhead, Jon (2016) Major zircon megacryst suites of the Indo-Pacific lithospheric margin (ZIP) and their petrogenetic and regional implications. Mineralogy and Petrology, 110 (2) 399-420 doi:10.1007/s00710-015-0421-3 | Journal (article/letter/editorial) | | volcanoclastic deposits that were derived from alkali basalt volcanic fields (Gübelin 1982; Groat 2014)...(Kirkland et al. 2014). Zircons formed in magmas where feldspar, particularly plagioclase, crystallized tend to...14 = Nebo Province, QLD; 15 = Chudleigh, QLD; 16 = McBride Province, QLD; 17 = McLean Province, QLD; 18...Chanthanburi-Trat region, Thailand; 23 = Bo Ploi region, Thailand; 24 = Denchai, Thailand; 25 = Laos; 26 = Hainan...Zircon megacrysts from the adjacent Cambodian and Thailand basalt fields include low-U types (between U 30 |  | | Journal (issue) | | Tokyo, Japan Prague, Czech Republic Bangkok, Thailand Timothy Adams Dorrit Jacob Karl Schmetzer ...Prairie, Washington Maidenhead, UK Bangkok, Thailand Emmanuel Fritsch Ren Lu D. Brian Thompson ...Richard W. Hughes George R. Rossman Bangkok, Thailand Pasadena, California gia.edu/gems-gemology Subscriptions...Diamond Jewellery. The Executive Board of the Province Council of Antwerp, Antwerp, pp. 23–36. Schmetzer...Diamond Jewellery. The Executive Board of the Province Council of Antwerp, Antwerp, pp. 13–22. Walgrave |  | | Journal (issue) | | result of a several weeks stay at Matara, which gem district he visited in response to an urgent request for...chemical analytical mitigated by methods utilizing alkali fusions of hitherto intractthe fusions, now now...Belligam. He also noted that zircons of the Matara district receive the name "Matara diamonds" for their finest...characterization of natural sapphires originating from alkali basalts or for the characterization of the most...originating from alkaline rocks, i.e. in most cases from alkali basalts. By measuring the crystal faces of the |  | | Journal (issue) | | Carlsbad, California Lucerne, Switzerland Bangkok, Thailand John L. Emmett Ren Lu Fanus Viljoen Brush...Richard W. Hughes Benjamin Rondeau Bangkok, Thailand Nantes, France Database Coverage Gems & Gemology’s...but the deposits in Ambondromifehy are formed in alkali basalts—two very different deposits, yet both from...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 |  | | Journal (issue) | | Thai Lapidary International Co. Ltd, Bangkok, Thailand, and the center and right rings are from Prima...Composition in Ruby from the Bo Rai Gem Field in Trat Province, Eastern Thailand By Supparat Promwongnan and...Schwarz, Federated International GemLab, Bangkok, Thailand; Menahem Sevdermish, Gemewizard Ltd, Ramat Gan...part of the Rae domain of the western Churchill Province, within the Neoarchean volcano-sedimentary Prince...famous deposits are hosted by the Deccan volcanic province in India (Ottens et al. 2019). During the past |  | | Book | | Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina: Insights into Their Origin...Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry...Vietnam—Potential Source and Links to Cenozoic Alkali Basalts Reprinted from: Minerals 2019, 9, 89, doi:10...pegmatite situated in the Borborema Pegmatitic Province (BPP) from Rio Grande do Norte in Northeast Brazil...alluvial sapphires from the Orosmayo region (Jujuy Province, NW Argentina) and importantly shows that there |  | | Book (edition) | | .................................. 1653 IX.3. Thailand ............................................................. 1938 IX.6. Malay Basin, Gulf of Thailand.................................................contractional event in Late Oligocene. Gulf of Thailand basins and Andaman Sea opened in response to rotation...unmodified impactite (Muong Nong type in S Laos, E Thailand), through dumb-bells and discs (thailandites,...Strait. New subdivision introducing C Indonesia Province, transition between Eurasian W Indonesia and Pacific- |
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