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Fluid-mediated partial alteration in monazite: the role of coupled dissolution–reprecipitation in element redistribution and mass transfer

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Abstract

Monazite [(Ce,LREE,Th,U,Ca)(P,Si)O4], with complex zoning in Th and other elements, is commonly observed in metamorphic and igneous rocks. The hypothesis that this alteration is a product of fluid-mediated element mass transfer has been tested in the piston-cylinder press (CaF2 assembly, cylindrical graphite oven) at 1,000 MPa and 900°C and in cold seal autoclaves on a hydrothermal line at 500 MPa and 600°C. Experiments included a relatively homogeneous monazite-(Ce) (7–8 wt% ThO2) from a heavy mineral sand plus a series of alkali-bearing fluids including 2N NaOH, 2N KOH, and Na2Si2O5 + H2O. Experiments were conducted using BSE imaging, EMP analysis, and both TEM and HRTEM. A subset of monazite grains from each experiment show evidence of partial alteration in the form of areas enriched in Th + Si with sharp curvilinear compositional boundaries extending from the grain rim into the monazite interior. These ThSiO4-enriched textures are similar to those commonly seen in natural examples of metasomatised monazite in both magmatic and metamorphic rocks. In the Na2Si2O5 + H2O experiments, scarce inclusions of britholite formed in the altered monazite. The altered monazite is also characterised by strong depletion in Pb, Ca, and Y. Thorium and Si mobility, coupled with the formation of britholite inclusions, during partial alteration in the monazite grain is considered to be the product of fluid-aided coupled dissolution–reprecipitation as opposed to solid-state diffusion. Since other fluids, including NaCl and KCl brines, do not result in the formation of these textures, the experimental replication of ThSiO4-enriched areas in the monazite strongly suggests that similar textures in monazite observed in nature are fluid induced, specifically by alkali-bearing fluids. If true, complex metasomatically induced textures in monazite could yield information concerning the nature of the fluid responsible for their formation as well as allow for the dating of the metasomatic event, presuming that all the original radiogenic Pb has been removed.

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Acknowledgments

We thank Mike Williams, Mike Jercinovic, Dieter Rhede, and Onna Appelt for support with the electron microprobe. Anja Schreiber is thanked for FIB preparation of the TEM foils. Helga Kemnitz is acknowledged for assistance with the SEM. Ilya Veksler is thanked for useful discussions during an early phase of the project. Daniel Dunkley is thanked for reviewing an earlier version of this paper. Jacques Touret, Andrew Putnis, Kazuhiro Suzuki, and Timo Nijland are thanked for their constructive reviews of the paper.

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  1. Section 3.3, GeoForschungsZentrum, Telegrafenberg, 14473, Potsdam, Germany

    Daniel E. Harlov & Richard Wirth

  2. Department of Geosciences, Texas Tech University, Lubbock, TX, 79409-1053, USA

    Callum J. Hetherington

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  1. Daniel E. Harlov
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Correspondence to Daniel E. Harlov.

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Communicated by J. L. R. Touret.

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Harlov, D.E., Wirth, R. & Hetherington, C.J. Fluid-mediated partial alteration in monazite: the role of coupled dissolution–reprecipitation in element redistribution and mass transfer. Contrib Mineral Petrol 162, 329–348 (2011). https://doi.org/10.1007/s00410-010-0599-7

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