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Solubility of rare earth elements in carbonatite magmas, indicated by the liquidus surface in CaCO_3-Ca(OH)_2-La(OH)_3 at 1 kbar pressure

Jones, A. P. and Wyllie, P. J. (1986) Solubility of rare earth elements in carbonatite magmas, indicated by the liquidus surface in CaCO_3-Ca(OH)_2-La(OH)_3 at 1 kbar pressure. Applied Geochemistry, 1 (1). pp. 95-102. ISSN 0883-2927 . http://resolver.caltech.edu/CaltechAUTHORS:20160120-152348571

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Abstract

The system CaCO_3-Ca(OH)_2(CC-CH) represents a synthetic analog to a carbonatite magma. Addition of a light rare earth (RE) component La(OH)_3 (LH) gives a simple analog of a rare earth carbonatite. Liquidus relations for two joins were studied at 1 kbar pressure; CH-LH and (CC_(55)CH_(45))-LH. CH-LH is binary with a eutectic at CH_(79)LH_(21) and 710°C. Thejoin CC_(55) + CH_(45))-LH has a liquidus piercing point between CC and LH, at (CC_(55)CH_(45))_(60)LH_(40) and 700°C. Combining the new results with known results for CC-CH allows construction of a liquidus diagram for part of the join CC-CH-LH. A ternary eutectic between the primary liquidus fields for CH, CC and LH occurs near 610°C with estimated composition CC= 33%, CH= 47%, LH= 20%. The solubility of La(OH)_3 in the synthetic carbonatite magma increases with increase of CO_2/H_2O from 20% at the eutectic to 40% at the piercing point on the join (CC_(55)CH_(45))-LH. The solubility of La in synthetic carbonatite is high compared with that of silicates. P_2O_5, and S. The results show that REE can become concentrated to high levels by fractionation of carbonatites, as long as they are not removed by high temperature crystallization of apatite and monazite.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0883-2927(86)90040-5DOIArticle
http://www.sciencedirect.com/science/article/pii/0883292786900405PublisherArticle
Alternate Title:Solubility of rare earth elements in carbonatite magmas, indicated by the liquidus surface in CaCO3-Ca(OH)2-La(OH)3 at 1 kbar pressure
Additional Information:© 1986 Elsevier Ltd. This research was supported by the Earth Sciences section of the U.S. National Science Foundation, grants EAR81-08599 and EAR83-117758. We thank R. J. Floran of Union Oil Research for his encouragement, and the Union Oil Company of California Foundation for a tangible contribution to the program.
Funders:
Funding AgencyGrant Number
NSFEAR81-08599
NSFEAR83-117758
Union Oil Company of California FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20160120-152348571
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160120-152348571
Official Citation:A.P. Jones, P.J. Wyllie, F. Earl Ingerson Festschrift (Part 1)Solubility of rare earth elements in carbonatite magmas, indicated by the liquidus surface in CaCO3Ca(OH)2La(OH)3 at 1 kbar pressure, Applied Geochemistry, Volume 1, Issue 1, 1986, Pages 95-102, ISSN 0883-2927, http://dx.doi.org/10.1016/0883-2927(86)90040-5. (http://www.sciencedirect.com/science/article/pii/0883292786900405)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63811
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Jan 2016 19:23
Last Modified:21 Jan 2016 19:23

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