ID: 34
rec_id: 34
depname: Ruri
deptype: 10
depage: 13 Sr-Nd
json: {"id":"http:\/\/mrdata.usgs.gov\/carbonatite\/record\/34","type":"Feature","geometry":{"type":"Point","coordinates":[34.334444444444,-0.53]},"properties":{"country":"Kenya","cntrycd":"KNYA","depname":"Ruri","latitude":"-0.53","latmin":-31,"latsec":-48,"longitude":"34.3344444444444","londeg":34,"lonmin":20,"lonsec":4,"mintype":"s\u00f6vite","oreton":"0.375","deptype":10,"niobium":"0","ree":"3.92","p2o5":"0","grades":"Jackson and Christiansen (1993); Re2O3 grade calculated from 5.6% monazite content in ore","depage":"13 Sr-Nd","agemy":"13","tectset":"Cenozoic (post-Karroo) East-African rift","rocks":"carbonatite, carbonatite agglomerate, carbonatite tuff, ijolite, nepheline syenite","rocksmap":"metabasalt (Neoarchean)","orebody_fm":"cone sheets and dikes in twin alkaliine-carbonatite volcanes","ore_a":"5.5","ore_area":"13","ore_b":"3","alttype":"fenitization","altwidth":"0","dep5km":"10","mineral":[{"role":"ore","name":"apatite"},{"role":"ore","name":"barite"},{"role":"ore","name":"bastnaesite"},{"role":"ore","name":"eudialyte"},{"role":"ore","name":"fluorite"},{"role":"ore","name":"g\u00f6tzenite"},{"role":"ore","name":"magnetite"},{"role":"ore","name":"monazite"},{"role":"ore","name":"pyrochlore"},{"role":"gangue","name":"aegerine"},{"role":"gangue","name":"biotite"},{"role":"gangue","name":"calcite"},{"role":"gangue","name":"cancrinite"},{"role":"gangue","name":"wollastonite"}],"reference":["Deines, P., and Gold, D.P., 1973, The isotopic composition of carbonatite and kimberlite carbonates and their bearing on the isotopic composition of deep-seated carbon: Geochimica et Cosmochimica Acta, v. 37, p. 1709\u00961733.","Jackson, W.D., and Christiansen, G., 1993, International strategic inventory summary report-\u0096rare-earth oxides: U.S. Geological Survey Circular 930-N, 68 p.","Jaff\u00e9, F.C., and Collins, B., 1969, Rare-earth concentrations in the South Ruri carbonatite in western Kenya: Transactions of Institution of Mining and Metallurgy, Section B, v. 78, no. 756, p. B161\u0096B163.","Kalt, A., Hegner, E., and Satir, M., 1997, Nd, Sr, and Pb isotopic evidence for diverse lithospheric mantle sources of East African carbonatites: Tectonophysics, v. 278, p. 31\u009645.","Le Bas, M.J., 2008, Fenites associated with carbonatites: The Canadian Mineralogist, v. 46, p. 915\u0096932.","McCall, G.J., 1963, A reconsideration of certain aspects of the Rangwa and Ruri carbonatite complexes in Western Kenya: Geological Magazine, v. 100, no. 2, p. 181\u0096185.","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.","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=34