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- W2033110413 abstract "Composite monazite-epidote grains in a staurolite schist protolith have reacted to form apatite, + thorite, with REE enrichment of the during amphibolite facies hydrothermal conditions of blackwall formation, Kvesjoen, east-central Norway. The simplified breakdown reaction is, [1.8 {+} 1.5 epidote {+} 11.1 H_{2}O {+} 6 Fe_{aq} = 0.6 {+} 1.5 chlorite {+} 1.8 REE_{aq} {+} 11.1 H{+}] with additional thorite (and a possible Y-oxide phase). The breakdown reaction is explained in terms of areas of utilisation (apatite) and destruction (thorite + chlorite) of the monazite phosphate structure in relation to several interrelated factors: coupled substitutions mainly involving P 5+ , REE 3+ , Th 4+ , U 4+ , Si 4+ , Ca 2+ , possibly (Fe,Al) 3+ ; dissolution (monazite) - reprecipitation (REE-poor apatite) with removal of REE by a fluid boundary layer. X-ray element distribution mapping shows that REE9s, Y, Th and U derived from monazite alteration probably remained within the boundaries of the original composite monazite-epidote grains. Magnesium, Fe, Mn, Cl (mainly in chlorite), F in apatite were introduced to the reaction site by way of a hydrous fluid; REE9s were largely fixed in the unreacted corona ( e.g. along grain boundaries); P, Th, U essentially remained at the reaction site in apatite and thorite. Radial cracks associated with REE-epidote and reacted epidote-monazite enclosed in corundum and staurolite of the blackwall resulted from volume expansion due to retrograde uptake of H 2 O (∼10 wt.%) into areas of inferred structurally damaged REE-epidote and/or formation of apatite + + thorite at monazite-epidote grain contacts. Decrease in bulk rock Ca and enrichment in Al during blackwall development favoured preservation of rather than monazite, and inhibited growth of new epidote." @default.
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- W2033110413 date "2005-07-25" @default.
- W2033110413 modified "2023-10-14" @default.
- W2033110413 title "Monazite-epidote reaction in amphibolite grade blackwall rocks" @default.
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- W2033110413 doi "https://doi.org/10.1127/0935-1221/2005/0017-0553" @default.
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