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The origins of contrasting zoning patterns in hyalophane from olivine leucitites, Northeast China

Published online by Cambridge University Press:  05 July 2018

Ming Zhang ,
Paul Suddaby ,
Robert N. Thompson  and
Michael A. Dungan
Ming Zhang
Affiliation:
Department of Geology, Imperial College, London SW7 2BP, U.K., and Department of Geological Sciences, Southern Methodist University, Dallas, TX 75275, U.S.A.
Paul Suddaby
Affiliation:
Department of Geology, Imperial College, London SW7 2BP, U.K.
Robert N. Thompson
Affiliation:
Department of Geological Sciences, University of Durham, Durham DH1 3LE, U.K.
Michael A. Dungan
Affiliation:
Department of Geological Sciences, Southern Methodist University, Dallas, TX 75275, U.S.A.
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Abstract

Olivine (ol) leucitite lavas from Northeast China contain hyalophanes with contrasting Ba-zoning patterns. The hyalophanes occur: (1) in a magmatic inclusion (DZ2n), consisting of barian-titanian phlogopite + hyalophane + leucite + sodalite, and (2) as a mantle surrounding a sanidine megacryst (DZ19). Hyalophanes contain 4.6-20.2 mol.% celsian (Cn). The DZ2n hyalophane is normally zoned with respect to Ba (decreasing Ba toward rim), whereas the hyalophane mantle of megacryst DZ19 is reversely zoned. DZ2n probably crystallised from an extensively evolved (>80 wt.% crystallisation) potassic melt derived from a primitive magma chemically similar to the host, at relatively low temperatures and pressures (e.g. T-720°C P∼2 kbar). Competition with barian-titanian phlogopite for Ba, and limited Ba supply from the residual melt are the main cause for the normal Ba zonation. Sanidine megacryst DZ19 originated as a high P-T product (e.g. T > 950°C P > 15 kbar) of an evolved leucite (lc) basanite/trachybasalt genetically related to ol-leucitites. Subsequently, it was incorporated into the host ol-leucititic magma at which point it was partially resorbed and then mantled by hyalophane. An increase in KBaaf/liq values with decreasing temperature and pressure and cocrystallisation of the hyalophane mantle with Ba-free phases may have caused the unusual reverse zonation.

Keywords

zoninghyalophaneleucititesChinaolivine
Type
Geochemistry and Petrology
Information
Mineralogical Magazine , Volume 57 , Issue 389 , December 1993 , pp. 565 - 573
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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Footnotes

*

Present address: School of Earth Sciences, Macquarie University, NSW 2102, Australia.

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