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Anatomy of a low temperature zircon outgrowth.
- Source :
- Contributions to Mineralogy & Petrology; Jan2010, Vol. 159 Issue 1, p81-92, 12p, 1 Black and White Photograph, 7 Diagrams
- Publication Year :
- 2010
-
Abstract
- Outgrowths of zircon and xenotime are abundant on detrital zircon in a greenschist facies regional metamorphic slate from the Scottish Highlands. Back-scattered electron images reveal that ca. 3-μm wide zircon outgrowths are porous, inclusion-rich and contain fine-grained intergrowths with xenotime. Focused ion beam milling, transmission electron microscopy and low-voltage scanning transmission electron microscopy show that the outgrowth microstructure is complex, composed of mis-orientated nano-crystalline zircon and a poorly crystalline zircon–xenotime complex. Well-defined micron-sized xenotime is also present within the outgrowth. Micro-textures show that the outgrowth developed in a polyphase history during cooling and exhumation. Accommodation space for the outgrowth is probably generated by a combination of thermal decompaction and the migration of defects in adjacent quartz driven by the force of crystallisation. Zircon may be unique in its ability to record textural evidence of events during uplift and exhumation that are not recorded in major silicate phases. [ABSTRACT FROM AUTHOR]
- Subjects :
- ZIRCON
GEMS & precious stones
SILICATE minerals
MINERALOGY
METAMORPHIC rocks
Subjects
Details
- Language :
- English
- ISSN :
- 00107999
- Volume :
- 159
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Contributions to Mineralogy & Petrology
- Publication Type :
- Academic Journal
- Accession number :
- 45472025
- Full Text :
- https://doi.org/10.1007/s00410-009-0417-2