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Eutectic between wollastonite II and calcite contrasted with thermal barrier in MgO-SiO_2-CO_2 at 30 kilobars, with applications to kimberlite-carbonatite petrogenesis

Huang, Wuu-Liang and Wyllie, P. J. (1974) Eutectic between wollastonite II and calcite contrasted with thermal barrier in MgO-SiO_2-CO_2 at 30 kilobars, with applications to kimberlite-carbonatite petrogenesis. Earth and Planetary Science Letters, 24 (2). pp. 305-310. ISSN 0012-821X. https://resolver.caltech.edu/CaltechAUTHORS:20160126-092454228

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Abstract

In the join CaCO_3-CaSiO_3 at 30 kbars, calcite melts at 1615°C, wollastonite II at 1600°C, and a binary eutectic occurs at 1365°C with liquid composition 43 wt.% CaCO_3, 57 wt.% CaSiO_3. The eutectic liquid quenches to a glass with few quench crystals. In the join MgCO_3-MgSiO_3 at 30 kbars, magnesite melts at 1590°C, enstatite at 1837°C, and the fields for the primary crystallization of magnesite and enstatite are separated by a thermal barrier near 1900°C for the melting of forsterite in the presence of CO_2. Only about 10 wt.% MgSiO_3 dissolves in the carbonate liquid. These data, are considered together with incomplete results for joins CaMgSi2O6-CaMg(CO_3)_2, CaMgSi_2O_6-MgCO_3, CaMgSi_2O_6-CaCO_3, and other published data in the system CaO-MgO-SiO_2-CO_2. A thermal barrier separates the silicate and carbonate liquids in MgO-SiO_2-CO_2 but, in the quaternary system, silicate liquids with dissolved CO_2 can follow fractionation paths around the forsterite field to the fields for the primary crystallization of carbonates. This suggests that fractional crystallization of CO_2-bearing ultrabasic magma at 100 km depth can produce residual carbonatite magma.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0012-821X(74)90109-5DOIArticle
http://www.sciencedirect.com/science/article/pii/0012821X74901095PublisherArticle
Alternate Title:Eutectic between wollastonite II and calcite contrasted with thermal barrier in MgO-SiO2-CO2 at 30 kilobars, with applications to kimberlite-carbonatite petrogenesis
Additional Information:© 1974 North-Holland Publishing Company, Amsterdam. Received September 3, 1974; Revised version received October 1, 1974. This research was supported by the Earth Sciences Section, National Science Foundation, NSF Grant GA-41730. We wish to acknowledge also the general support of the Materials Research Laboratory by the National Science Foundation.
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Funding AgencyGrant Number
NSFGA-41730
Issue or Number:2
Record Number:CaltechAUTHORS:20160126-092454228
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160126-092454228
Official Citation:Wuu-Liang Huang, P.J. Wyllie, Eutectic between wollastonite II and calcite contrasted with thermal barrier in MgO-SiO2-CO2 at 30 kilobars, with applications to kimberlite-carbonatite petrogenesis, Earth and Planetary Science Letters, Volume 24, Issue 2, 1974, Pages 305-310, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(74)90109-5. (http://www.sciencedirect.com/science/article/pii/0012821X74901095)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63964
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Jan 2016 18:33
Last Modified:03 Oct 2019 09:33

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