ID: 35
rec_id: 35
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."]}}
url: https://mrdata.usgs.gov/carbonatite/show-carbonatite.php?rec_id=35