by U.S. Dept. of the Interior, U.S. Geological Survey in Menlo Park, CA .
Written in English
|Statement||by Donald A. Singer|
|Series||Open-file report -- 98-235, U.S. Geological Survey open-file report -- 98-235|
|Contributions||Geological Survey (U.S.)|
|The Physical Object|
Revised grade and tonnage model of carbonatite deposits (OCoLC) Print version: Singer, Donald A. Revised grade and tonnage model of carbonatite deposits (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors. Deposit size Minable carbonatite deposits typically range in size from approximately 6 to M metric tons (Singer, b). Host rocks Rocks constituting carbonatite deposits may include varieties of carbonatite, including calcite-rich (sövite), dolomite-. The compiled database (appendix 1; linked to right) contains 60 explored Nb- and REE-bearing carbonatite deposits—resources of 55 of these deposits are taken from publications. In the present updated grade-tonnage model we have added 24 deposits comparing with the previous model . contains 60 explored Nb– and REE–bearing carbonatite deposits—resources of 55 of these deposits are taken from publications. In the present updated grade- tonnage model we have added 24 deposits comparing with the previous model of Singer (). Resources of most deposits are residuum ores in the upper part of carbonatite bodies.
Book PDF Available. ), 3 carbonatite (Model 10), 3 apatite-magnetite, and 1 titanium d eposits are know n. Within 10 km, versus the tonnage or grade of the deposits. Individual symbols. Singer, D.A., , Revised grade and tonnage model of carbonatite deposits: U.S. Geological Survey Open-File Report , 7 p. Comments Apatite has high REE. Grade and tonnage of a) Nb, and b) Ta deposits associated with carbonatite complexes relative to pegmatites, peralkaline complexes, and rare-element granites. Diagonal lines indicate isotonnage of. Carbonatite is a unique type of intrusive igneous deposit which is rich in calcium carbonate (calcite, CaCO 3) and minerals of the carbonate m carbonate is typically burned out of igneous materials by intense heat; the preponderance of calcite found in carbonatite therefore makes it a very unusual type of igneous formation.
Although carbonatite is magmatic in origin, most of the high-grade ores of this type are formed by subsequent hydrothermal activities (Smith et al., ; Wall et al., ; Williams-Jones et al., ; Xie et al., ).Some representative deposits (Bayan Obo, Mountain Pass, Mount Weld) possess large reserves (> 1 Mt REO) and relatively high-grade ores (> 4 wt.%) that can fully cover the. Carbonatites can be effectively detected by soil, till, and stream-sediment geochemical surveys, as well as biogeochemical and indicator mineral surveys Carbonatites and alkaline-carbonatite complexes are the main sources of rare earth elements (REE) and Nb, and host significant deposits of apatite, vermiculite, Cu, Ti, fluorite, Th, U, natural. Carbonatite-associated deposits include a variety of mineral deposits that occur both within and in close spatial association with carbonatites and related alkalic silicate rocks. Carbonatite-associated deposits are mined for rare- earth elements (REEs), niobium, . Singer, D.A., , Revised grade and tonnage model of carbonatite deposits: U.S. Geological Survey Open-File Report , 7 p. Drew, L.J., Qingrun, M., and Weijun.