Origin of carbonatites; evidence from phase equilibrium studies

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Authors:Wyllie, P. J.
Author Affiliations:Primary:
Calif. Inst. Technol., Div. Geol. and Planet. Sci., Pasadena, CA, United States
Volume Title:Carbonatites; genesis and evolution
Volume Authors:Bell, Keith, editor
Source:Carbonatites; genesis and evolution, edited by Keith Bell, p.500-545. Publisher: Unwin Hyman, London, United Kingdom. ISBN: 0-04-445068-0
Publication Date:1989
Note:In English. 145 refs.; illus.
Summary:An integrated model is developed for the generation of crustal carbonatites from deep-mantle carbon, some probably derived through subduction. After generation of silicate melts in the asthenosphere, the melts are processed in the lithosphere associated with rifting, and parental nephelinitic melts from approx 75 km depth then yield the C in the form of carbonatite at depths between 75 km and the surface. Experimental phase equilibrium data are reviewed. The real prospect that primary carbonatites could be erupted from the mantle justifies a search for them, but the high ratio of silicate:carbonatite in most alkalic complexes argues against this origin. [R.E.S.]
Subjects:Carbonatites; Experimental studies; Genesis; Igneous rocks; Immiscibility; Materials; Melts; Metasomatism; P-T conditions; Phase equilibria; CaCO<3`-Ca(OH)<2`-CaF<2`-BaSO<4`; CaCO<3`-Ca(OH)<2`-La(OH)<3`; CaCO<3`-MgCO<3`-Mg(OH)<2`-Ca(OH)<2`; CaO-MgO-CO<2`-H<2`O; CaO-MgO-SiO<2`-CO<2`-H<2`O; NaAlSiO<4`-CaCO<3`-H<2`O
Abstract Numbers:90M/2162
Record ID:1989078449
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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