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    "depname" : "Chilwa Island",
    "deptype" : 10,
    "depage" : "136±7 K-Ar, biotite;|125.8±7.7 fission-track, titanite & zircon",
    "json" : "{\"id\":\"http:\\/\\/mrdata.usgs.gov\\/carbonatite\\/record\\/35\",\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[35.601944444444,-15.331666666667]},\"properties\":{\"country\":\"Malawi\",\"cntrycd\":\"MLWI\",\"depname\":\"Chilwa Island\",\"latitude\":\"-15.3316666666667\",\"latdeg\":-15,\"latmin\":-19,\"latsec\":-54,\"longitude\":\"35.6019444444444\",\"londeg\":35,\"lonmin\":36,\"lonsec\":7,\"mintype\":\"Fe-carbonatite, s\\u00f6vite\",\"oreton\":\"0.375\",\"deptype\":10,\"niobium\":\"0.95\",\"ree\":\"5\",\"p2o5\":\"0\",\"grades\":\"Gupta and Kishnamurthy (2004), Malunga (2009), Ministry... (2009)\",\"depage\":\"136\\u00b17 K-Ar, biotite;|125.8\\u00b17.7 fission-track, titanite & zircon\",\"agemy\":\"136\",\"tectset\":\"East African rift system; southern part of Tanganyike-Rukwa-Malawi transcurrent fault zone; Chilwa alkaline province\",\"rocks\":\"agglomerate, carbonatite, feldspathic breccia, foyaite, ijolite, nepheline syenite, dikes of nephelinite, phonolite, and trachyte\",\"rocksmap\":\"gneiss, granulite (Precambrian), syenite (Cretaceous)\",\"orebody_fm\":\"circular plug\",\"ore_a\":\"3.4\",\"ore_area\":\"8.5\",\"ore_b\":\"3.2\",\"alttype\":\"fenitization\",\"altwidth\":\"1\",\"dep5km\":\"10\",\"comments\":\"5% Re2O3 in ore, including 2.2% Sm2O3, 0.47% Eu2O3, 1.64% Y2O3; apatite contains 7.12% La and 13.7% Ce; pyrochlore contains 1.3\\u00962.76% Ce (Gupta and Kishnamurthy, 2004).\",\"mineral\":[{\"role\":\"ore\",\"name\":\"apatite\"},{\"role\":\"ore\",\"name\":\"barite\"},{\"role\":\"ore\",\"name\":\"bastnaesite\"},{\"role\":\"ore\",\"name\":\"columbite\"},{\"role\":\"ore\",\"name\":\"florencite\"},{\"role\":\"ore\",\"name\":\"fluorite\"},{\"role\":\"ore\",\"name\":\"pyrite\"},{\"role\":\"ore\",\"name\":\"pyrochlore\"},{\"role\":\"ore\",\"name\":\"rutile\"},{\"role\":\"ore\",\"name\":\"synchysite\"},{\"role\":\"ore\",\"name\":\"titanite\"},{\"role\":\"gangue\",\"name\":\"amphibole\"},{\"role\":\"gangue\",\"name\":\"ankerite\"},{\"role\":\"gangue\",\"name\":\"biotite\"},{\"role\":\"gangue\",\"name\":\"calcite\"},{\"role\":\"gangue\",\"name\":\"feldspar\"},{\"role\":\"gangue\",\"name\":\"melanite\"},{\"role\":\"gangue\",\"name\":\"phlogopite\"},{\"role\":\"gangue\",\"name\":\"pyroxene\"},{\"role\":\"gangue\",\"name\":\"siderite\"},{\"role\":\"gangue\",\"name\":\"quartz\"},{\"role\":\"gangue\",\"name\":\"spinel\"}],\"reference\":[\"Eby, G.N., Roden-Tice, M., Krueger, H.L., Ewing, W., Faxon, E.H., and Woolley, A.R., 1995, Geochronology and cooling history of the northern part of the Chilwa alkaline province, Malawi: Journal of African Earth Sciences, v.20, no. 3-4, p. 275\\u0096288.\",\"Garson, M.S., 1966, Carbonatites in Malawi, in Tuttle, O.F., and Gittins, J., eds., Carbonatites: New York, Interscience Publishers, p. 33\\u009671.\",\"Gupta, C.K., and Kishnamurthy, N., 2004, Extractive metallurgy of rare earth: CRC Press, 506 p.\",\"Malunga, G.W.P., 2009,  Mineral potential of the Nacala corridor, Malawi, 12 p.,\",\"http:\\/\\/www.sdnp.org.mw\\/geosoc-mw\\/mineralpotential.htm (last visited February 17, 2009)\",\"Ministry of Energy and Mines, Republic of Malawi, 2009, Mineral potential of Malawi, 8 p.,\",\"http:\\/\\/www.bgs.ac.uk\\/downloads\\/start.cfm?id=1239 (last visited February 17, 2009)\",\"Tiercelin, J.J., Chorowicz, J., Belloni, H., Richert, J.P., Mwanbene, J.T., and Walgenwitz, F., 1988, East African Rift System\\u0097Offset, age and tectonic significance of the Tanganyika-Rukwa-Malawi intracontinental transcurrent fault zone: Tectonophysics, v. 148, p. 241\\u0096252\",\"Woolley, A.R., 2001, Alkaline rocks and carbonatites of the world \\u0096 Part 3: Africa: London, The Geological Society, 372 p.\"]}}",
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