ID: 9
rec_id: 9
depname: Seis Lagos
deptype: 10
depage: Cretaceous (?)
json: {"id":"http:\/\/mrdata.usgs.gov\/carbonatite\/record\/9","type":"Feature","geometry":{"type":"Point","coordinates":[-66.680277777778,0.28194444444444]},"properties":{"country":"Brazil","cntrycd":"BRZL","stprov":"Amazonas","depname":"Seis Lagos","altname":"Morro dos Seis Lagos","latitude":"0.281944444444444","latmin":16,"latsec":55,"longitude":"-66.6802777777778","londeg":-66,"lonmin":-40,"lonsec":-49,"discdate":"1975","mintype":"beforsite","oreton":"2898","deptype":10,"niobium":"2.81","ree":"1.5","p2o5":"0","grades":"Cuadros Justo and de Souza (1986), Kamitani and Hirano (1990)","depage":"Cretaceous (?)","agemy":"100","tectset":"Guyana shield","rocks":"breccia, carbonatite, syenite","rocksmap":"gneiss, migmatite (Precambrian)","orebody_fm":"3 plugs of 4, 0.9, and 0.8 km in diameter, along NS zone 8 km long","ore_a":"4","ore_area":"12.6","ore_b":"4","alttype":"laterite","altwidth":"0","comments":"1.5% Re2O3, 0.07% ThO2, and 0.09% V2O5 reported in lateritic cover ~230 m thick (Woolley, 1987). The largest Nb deposit in the world. CarbBodyArea value reflects the main plug only.","mineral":[{"role":"ore","name":"barite"},{"role":"ore","name":"crandallite"},{"role":"ore","name":"florencite"},{"role":"ore","name":"goethite"},{"role":"ore","name":"hematite"},{"role":"ore","name":"limonite"},{"role":"ore","name":"nb-brookite"},{"role":"ore","name":"nb-rutile"},{"role":"ore","name":"pyrite"},{"role":"ore","name":"pyrochlore"},{"role":"gangue","name":"ankerite"},{"role":"gangue","name":"dolomite"},{"role":"gangue","name":"siderite"}],"reference":["Cuadros Justo, L.J.E., and Souza de, M.M., 1986, Jazida de ni\u00f3bio do morro dos Seis Lagos, Amazonas: in Schobbenhaus, C., and Silva Coelho, C.E., eds., Principas dep\u00f3sitos minerais do Brasil, v. 2, Cap\u00edtulo 37: Brasilia, Departmento Nacional da Produ\u00e7\u00e3o Mineral, p. 463\u0096468.","Gomes, C.B., Ruberti, E., and Morbidelli, L., 1990, Carbonatite complexes from Brazil\u0097A review: Journal of South American Earth Sciences, v. 3, no. 1, p. 51\u009663.","Jacobi, P., 2009, Seis Lagos the largest niobium reserve in the world is still waiting to be developed, 5 p.: http:\/\/www.geologo.com.br\/seislagos.asp (last visited February 6, 2009)","Kamitani, M., and Hirano, H., 1990, Important carbonatite-alkaline\/alkaline complexes and related mineral resources in the world: Bulletin of the Geological Survey of Japan, v. 41, no. 11, p. 631\u0096640.","Singer, D.A., 1998, Revised grade and tonnage model of carbonatite deposits: U.S. Geological Survey Open-File Report 98-235, 8 p.","Ulbrich, H.H.G.J., and Gomes, C.B., 1981, Alkaline rocks from continental Brazil: Earth-Science Reviews, v. 17, p. 135\u0096154.","Woolley, A.R., 1987, Alkaline rocks and carbonatites of the world \u0096 Part 1: North and South America: London, British Museum (Natural History), 216 p."]}}
url: https://mrdata.usgs.gov/carbonatite/show-carbonatite.php?rec_id=9