ID: 60
rec_id: 60
depname: Nkombwa Hill
deptype: 10
depage: 679±25 K-Ar, phlogopite
json: {"id":"http:\/\/mrdata.usgs.gov\/carbonatite\/record\/60","type":"Feature","geometry":{"type":"Point","coordinates":[32.851666666667,-10.149444444444]},"properties":{"country":"Zambia","cntrycd":"ZMBA","depname":"Nkombwa Hill","altname":"Nkumbwa Hill","latitude":"-10.1494444444444","latdeg":-10,"latmin":-8,"latsec":-58,"longitude":"32.8516666666667","londeg":32,"lonmin":51,"lonsec":6,"discdate":"1954","mintype":"Fe-carbonatite, rauhaugite","oreton":"130","deptype":10,"niobium":"0.1","ree":"0.3","p2o5":"7.3","grades":"Sliwa (1991), Rocks for Crops (2001); RE2O3 grade calculated from these sources","depage":"679\u00b125 K-Ar, phlogopite","agemy":"680","tectset":"Pan-African tectonic belt; NE fault system","rocks":"carbonatite, fenite","rocksmap":"gneiss (Proterozoic)","orebody_fm":"oval plug, dikes","ore_a":"1.7","ore_area":"1.2","ore_b":"0.9","alttype":"fenitization","altwidth":"0","comments":"Calcite carbonatite (s\u00f6vite) is not present, silica-iron oxide rocks are widespread.","mineral":[{"role":"ore","name":"apatite"},{"role":"ore","name":"barite"},{"role":"ore","name":"bastnaesite"},{"role":"ore","name":"daqingshanite"},{"role":"ore","name":"fluorite"},{"role":"ore","name":"ilmenite"},{"role":"ore","name":"isokite"},{"role":"ore","name":"monazite-(ce)"},{"role":"ore","name":"pyrite"},{"role":"ore","name":"pyrochlore"},{"role":"ore","name":"sellaite"},{"role":"ore","name":"strontianite"},{"role":"gangue","name":"ankerite"},{"role":"gangue","name":"calcite"},{"role":"gangue","name":"dolomite"},{"role":"gangue","name":"magnesite"},{"role":"gangue","name":"phlogopite"},{"role":"gangue","name":"quartz"},{"role":"gangue","name":"siderite"}],"reference":["Appleton, J.D., Bland, D.J., and others, 1992, The occurrence daqingshanite-(Ce) in the Nkombwa Hill carbonatite, Zambia: Mineralogical Magazine, v. 56, p. 419\u0096422.","Bailey, D.K., 1966, Carbonatite volcanoes and shallow intrusions in Zambia, in Tuttle, O.F., and Gittins, J., eds., Carbonatites: New York, Interscience Publishers, p. 127\u0096154.","Orris, G.J., and Grauch, R.I., 2002, Rare earth element mines, deposits, and occurrences: U.S. Geological Survey Open-File Report 02-189, 174 p.","Rocks for Crops, 2001, Zambia, p. 311\u0096322: http:\/\/www.uoguelph.ca\/~geology\/rocks_for_crops\/55zambia.PDF","Sliwa, A.S., 1991, Phosphate resources of Zambia and progress in their exploration: Fertilizer Research, v. 30, p. 203\u0096212.","Turner, D.C., Andersen, L.S., Punukollu, S.N., Sliwa, A., and Tembo, F., 1989, Igneous phosphate resources in Zambia, in Notholt, A.J.G., Sheldon, R.P., and Davidson, D.F., eds., Phosphate deposits of the world: Cambridge University Press, v. 2, p. 247\u0096257.","Witika, L.K., 2007, The Nkombwa Hill carbonatite of Isoka district, as a potential source of phosphate minerals, agricultural lime and rare minerals, 6 p.,","http:\/\/www.unza.zm\/index.php?option=com_docman&task=doc_download&gid= 127 (last visited May 18, 2009)","Woolley, A.R., 2001, Alkaline rocks and carbonatites of the world, Part 3\u0097Africa: London, The Geological Society, 372 p.","Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R., 1997, Bastn\u00e4site-(Ce) at the Nkombwa Hill carbonatite complex, Isoka district, northeast Zambia: Mineralogy and Petrology, v. 59, p. 239\u0096250."]}}
url: https://mrdata.usgs.gov/carbonatite/show-carbonatite.php?rec_id=60