ID: 41
rec_id: 41
depname: Eureka
deptype: 10
depage: 500±20 U-Pb, 440±51 Sm-Nd isochrone
json: {"id":"http:\/\/mrdata.usgs.gov\/carbonatite\/record\/41","type":"Feature","geometry":{"type":"Point","coordinates":[15.263611111111,-22.055833333333]},"properties":{"country":"Namibia","cntrycd":"NAMB","stprov":"Damaraland","depname":"Eureka","latitude":"-22.0558333333333","latdeg":-22,"latmin":-3,"latsec":-21,"longitude":"15.2636111111111","londeg":15,"lonmin":15,"lonsec":49,"mintype":"beforsite","oreton":"0.03","deptype":10,"niobium":"0","ree":"6.3","p2o5":"0","grades":"McManus and Schneider (1994); Orris and Grauch (2002)","depage":"500\u00b120 U-Pb, 440\u00b151 Sm-Nd isochrone","agemy":"500","tectset":"Neoproterozic Damara orogenic belt","rocks":"carbonatite","rocksmap":"calc-silicate rocks, quartzite (Neoproterozoic)","orebody_fm":"dikes (?7 m thick)","alttype":"fenitization","altwidth":"0","comments":"Potential resource of 1.9 Kt Re2O3 in 30 Kt ore to 20 m depth.","mineral":[{"role":"ore","name":"magnetite"},{"role":"ore","name":"monazite"},{"role":"ore","name":"zircon"},{"role":"gangue","name":"calcite"},{"role":"gangue","name":"dolomite"},{"role":"gangue","name":"garnet"}],"reference":["Burger, A.J., Von Knorring, O., and Clifford, T.N., 1965, Mineralogical and radiometric studies of monazite and sphene occurrences in the Namibia desert, South-West Africa: Mineralogical Magazine, v. 35, p. 519\u0096528.","Dunai, T., Stoessel, G.F.U., and Ziegler, U.R.F., 1989, A Sr isotope study of the Eureka carbonatite, Damaraland, Namibia: Communications of Geological Survey of Namibia, v. 5, p. 89\u009690.","McManus, M.N.C., and Schneider, G.I.S, 1994, Namibia: industrial minerals, in Mathers, S.J., and Notholt, A.J.G., eds., Industrial minerals in developing countries: British Geological Survey, AGID Report Series, no. 18, p. 111\u0096134.","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.","Verwoerd, W.J., 1993, Update on carbonatites of South Africa and Namibia: South African Journal of Geology, v. 96, no. 3, p. 75\u009695.","Woolley, A.R., 2001, Alkaline rocks and carbonatites of the world \u0096 Part 3: Africa: London, The Geological Society, 372 p.","Ziegler, U.R.F., and Dunai, T.J., 1991, A Nd-Sr isotope study of the Eureka carbonatite, Damaraland, Namibia [abs.]: Terra Abstracts, v. 3, no. 1, p. 14."]}}
url: https://mrdata.usgs.gov/carbonatite/show-carbonatite.php?rec_id=41