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Occurrence and late re-equilibration of pollucite from the Koktokay no. 3 pegmatite, Altai, northwestern China
-
Ru Cheng Wang
,
Huan Hu
Published/Copyright:
March 31, 2015
Abstract
The Koktokay no. 3 pegmatite, Altai, NW China, is a strongly zoned spodumene-subtype pegmatite. Pollucite is the unique ore mineral exploited for Cs in this pegmatite. It occurs in internal textural zones of the pegmatite in different abundances. Primary pollucite is largely homogeneous, but it displays a broad range of composition between different textural zones with CRK [=100(Cs + Rb + K)/(Na + K + Rb + Cs + Mg + Ca)] = 74.86 and Si/Al = 2.20.2.51. Four principal types of pollucite were distinguished. (1) First is pollucite with blebby mosaic texture consisting of Na-enriched and Cs-enriched phases, which clearly resulted from local exsolution of primary pollucite in the sub-solidus state. (2) The second type is nearly end-member pollucite (CRK > 90) that occurs as an aureole of primary pollucite in contact with lepidolite or feldspar clusters. This is formed by dissolution/ re-precipitation of primary pollucite. (3) Symplectic pollucite is associated with quartz, observed in sub-parallel veinlets penetrating surrounding albite crystals; compositionally, this pollucite attains a CRK ratio of up to 96 and resulted from replacement of albite by Cs-rich fluids. (4) Oscillatoryzoned pollucite is the fourth type, typically restricted to the contact of pollucite with small miarolitic cavities. The zonation compositionally oscillates about the Cs/Na variations, and is simply related to locally changing fluid composition.
Received: 2004-12-20
Accepted: 2005-11-18
Published Online: 2015-3-31
Published in Print: 2006-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Pollucite;
compositional heterogeneity;
re-equilibration;
pegmatite;
Altai
Articles in the same Issue
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- Chemical bonding and electronic structures of the Al2SiO5 polymorphs, andalusite, sillimanite, and kyanite: X-ray photoelectron- and electron energy loss spectroscopy studies
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- Quench rate and temperature effects on framework ordering in aluminosilicate melts
- The effect of sodium on the solubilities of metals in silicate melts
- Nanotunnels and pull-aparts: Defects of exsolution lamellae in alkali feldspars
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