ID: 48
rec_id: 48
depname: Tomtor
deptype: 10
depage: 660
json: {"id":"http:\/\/mrdata.usgs.gov\/carbonatite\/record\/48","type":"Feature","geometry":{"type":"Point","coordinates":[116.57111111111,71.053611111111]},"properties":{"country":"Russia","cntrycd":"RUSA","stprov":"Sakha (Yakutia)","depname":"Tomtor","latitude":"71.0536111111111","latdeg":71,"latmin":3,"latsec":13,"longitude":"116.571111111111","londeg":116,"lonmin":34,"lonsec":16,"startdate":"2006 (?)","mintype":"beforsite, s\u00f6vite","deptype":10,"niobium":"0","ree":"0","p2o5":"0","grades":"Approved resources are unavailable.","depage":"660","agemy":"660","tectset":"Neoproterozoic longitudinal Udgy paleorift between Anabar shield and Olenek uplift","rocks":"carbonatite, jacupirangite, nepheline syenite, picrite breccia, urtite","rocksmap":"dolomite, sandstone, siltstone (Neoproterozoic)","orebody_fm":"central stock, 31.4 sq. km in circular alkaline complex","ore_area":"300","alttype":"fenitization","altwidth":"0","comments":"Resources approximately calculated on a base of data from Kogarko and others (1995), Kravchenko and others (1993, 1995), Lapin and Tolstov (1993): Upper oxidized zone (3\u009625 m thick, ~1.2 sq. km area, 2.24 g\/cubic cm specific gravity) 40 Mt at ?12% Nb2O5, 11\u009630% RE2O3. Lower oxidized zone (?300 m thick, ~150 m average, ~9 sq. km area, ~2.5 specific gravity) contains >3,000 Mt resources at 1\u00961.5% Nb2O5 and 4\u00966% RE2O3. Primary carbonatite contains 0.5\u00960.7% RE2O3 and lower content of niobium. Mined ore contains 9\u009612% RE2O3 (Naumov, 2008). Deposit is covered by Mesozoic-Cenozoic sediments. Upper oxidized zone (formed at ~400 Ma) occurs under Permian clastic rocks in local paleodepressions above carbonatite stock. Hydrothermal overprint (400\u0096320 Ma) at 250\u0096200 \u00baC.","mineral":[{"role":"ore","name":"apatite"},{"role":"ore","name":"barite"},{"role":"ore","name":"columbite"},{"role":"ore","name":"crandallite"},{"role":"ore","name":"florencite-(ce)"},{"role":"ore","name":"galena"},{"role":"ore","name":"goethite"},{"role":"ore","name":"gorceixite"},{"role":"ore","name":"goyazite"},{"role":"ore","name":"ilmenorutile"},{"role":"ore","name":"limonite"},{"role":"ore","name":"magnetite"},{"role":"ore","name":"monazite-(ce)"},{"role":"ore","name":"pyrite"},{"role":"ore","name":"pyrochlore"},{"role":"ore","name":"rabdophane-(ce)"},{"role":"ore","name":"r\u00f6ntgenite-(ce)"},{"role":"ore","name":"rutile"},{"role":"ore","name":"sphalerite"},{"role":"ore","name":"sr-pyrochlore"},{"role":"ore","name":"tin"},{"role":"ore","name":"xenotime-(y)"},{"role":"gangue","name":"aegerine"},{"role":"gangue","name":"amphibole"},{"role":"gangue","name":"ankerite"},{"role":"gangue","name":"ba-phlogopite"},{"role":"gangue","name":"calcite"},{"role":"gangue","name":"chlorite"},{"role":"gangue","name":"clinopyroxene"},{"role":"gangue","name":"dolomite"},{"role":"gangue","name":"forsterite"},{"role":"gangue","name":"garnet"},{"role":"gangue","name":"gypsum"},{"role":"gangue","name":"hydromica"},{"role":"gangue","name":"k-feldspar"},{"role":"gangue","name":"kaolinite"},{"role":"gangue","name":"leucite"},{"role":"gangue","name":"phlogopite"},{"role":"gangue","name":"rhodochrosite"},{"role":"gangue","name":"svanbergite"}],"reference":["Kogarko, L.N., Kononova, V.A., Orlova, M.P., and Woolley, A.R., 1995, Alkaline rocks and carbonatites of the world, Part 2\u0097Former USSR: London, Chapman & Hall, 226 p.","Kravchenko, S.M., Belyakov, A.Y., Kubyshev, A.I., and Tolstov, A.V., 1990, Scandium-rare earth-yttrium-niobium ores\u0097a new economic resource: International Geology Review, v. 32, no. 3, p. 280\u0096284.","Kravchenko, S.M., Belyakov, A.Y., and Pokrovskiy, B.G., 1993, Geochemistry and origin of the Tomtor massif in the north Siberian platform: Geochemistry International, v. 30, no. 3, p. 20\u009636.","Kravchenko, S.M., and Pokrovskiy, B.G., 1995, The Tomtor alkaline ultrabasic and related REE-Nb deposits, northern Siberia: Economic Geology, v. 90, p. 676\u0096689.","Lapin, A.V., and Tolstov, A.V., 1993, A new unique rare metals ore deposit in the carbonatitic crust weathering: Exploration and Protection of Mineral Resources (Razvedka i Okhrana Nedr), no. 3, p. 7\u009611 (in Russian).","Naumov, A.V., 2008, Review of the world market of rare-earth metals: Russian Journal of Non-Ferrous Metals, v. 49, no. 1, p. 14\u009622."]}}
url: https://mrdata.usgs.gov/carbonatite/show-carbonatite.php?rec_id=48