ID: 42
rec_id: 42
depname: Kalkfeld
deptype: 10
depage: 172.8–153.6 K-Ar, biotite
json: {"id":"http:\/\/mrdata.usgs.gov\/carbonatite\/record\/42","type":"Feature","geometry":{"type":"Point","coordinates":[16.1325,-20.819444444444]},"properties":{"country":"Namibia","cntrycd":"NAMB","stprov":"Damaraland","depname":"Kalkfeld","latitude":"-20.8194444444444","latdeg":-20,"latmin":-49,"latsec":-10,"longitude":"16.1325","londeg":16,"lonmin":7,"lonsec":57,"startdate":"1963","mintype":"s\u00f6vite","deptype":10,"niobium":"0","ree":"0","p2o5":"0","depage":"172.8\u0096153.6 K-Ar, biotite","agemy":"163","tectset":"Neoproterozic Damara orogenic belt; Late Mesozoic alkaline magmatic province probably related to opening of South Atlantic and to Tristan da Cunha plume","rocks":"carbonatite, hematitic iron ore, fenite, foyaite, syenite","rocksmap":"granite, marble, quartzite (Neoproterozoic)","orebody_fm":"plug in alkaline complex 4x8 km","ore_a":"2","ore_area":"2.4","ore_b":"1.5","alttype":"fenitization","altwidth":"0","dep5km":"10","comments":"0.5% ThO2 in hematitic iron ore; ?6.7% P2O5, 1.82% SrO in carbonatite. Iron ore was mined as a flux for the Tsumeb Cu-Pb plant.","mineral":[{"role":"ore","name":"apatite"},{"role":"ore","name":"barite"},{"role":"ore","name":"burbankite"},{"role":"ore","name":"carbocernaite"},{"role":"ore","name":"chalcocite"},{"role":"ore","name":"eudialyte"},{"role":"ore","name":"hematite"},{"role":"ore","name":"magnetite"},{"role":"ore","name":"monazite"},{"role":"ore","name":"pyrite"},{"role":"ore","name":"pyrochlore"},{"role":"ore","name":"sphalerite"},{"role":"ore","name":"strontianite"},{"role":"ore","name":"titanite"},{"role":"gangue","name":"albite"},{"role":"gangue","name":"ankerite"},{"role":"gangue","name":"biotite"},{"role":"gangue","name":"calcite"},{"role":"gangue","name":"chlorite"},{"role":"gangue","name":"phlogopite"},{"role":"gangue","name":"quartz"}],"reference":["B\u00fchn, B., 2008, The role of volatile phase for REE and Y fractionation in low-silica carbonate magmas\u0097Implications from natural carbonatites, Namibia: Mineralogy and Petrology, v. 92, p. 453\u0096470.","B\u00fchn, B., and Rankin, A.H., 1999, Composition of natural, volatile-rich Na-Ca-REE-Sr carbonatitic fluids trapped in fluid inclusions: Geochimica and Cosmochimica Acta, v. 63, p. 3781\u00963797.","Comin-Chiaramonti, P., de Barros Gomes, C., Cundari, A., Castorina, F., and Censi, P., 2007, A review of carbonatite magmatism in the Paran\u00e1-Angola-Namibia (PAN) system: Periodico di Mineralogia, v. 76, no. 2-3, p. 25\u009678.","McManus, M.N.C., and Schneider, G.I.S, 1994, Namibia\u0097Industrial 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.","Prins, P., 1981, The geochemical evolution of the alkaline and carbonatite complexes of the Damaraland igneous province, south west Africa: Annale Universiteit van Stellenbosch, Serie A1 (Geologie), v. 3, p. 145\u0096278.","Verwoerd, W.J., 1967, The carbonatites of South Africa and South West Africa: Geological Survey of Republic of South Africa Handbook 6, 452 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."]}}
url: https://mrdata.usgs.gov/carbonatite/show-carbonatite.php?rec_id=42