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Brittle fracturing and fracture healing of zircon: An integrated cathodoluminescence, EBSD, U-Th-Pb, and REE study

Rimsa, Andrius LU ; Whitehouse, Nij.; Johansson, Leif LU and Piazolo, S. (2007) In American Mineralogist 92(7). p.1213-1224
Abstract
The entire population of magmatic oscillatory zoned zircons in a migmatitic granite from the Tjarnesjo intrusion, southwest Sweden, reveal fine-scale brittle fracturing. The oscillatory zoned fragments are rotated but not dispersed. Fractures between individual fragments are sealed by newly formed CL-bright zircon. Hydraulic fracturing is the most probable mechanism. The internal structure of fractured zircons and the LREE-enriched, low Th character of CL-bright zircon both suggest that cracks between oscillatory zoned zircon fragments were rapidly sealed after fracturing by CL-bright zircon, precipitated from hydrothermal fluids. Zircon fracturing and crack-sealing has been dated by SIMS ion-probe and U-Th-Pb isotopes to 920 +/- 51 Ma... (More)
The entire population of magmatic oscillatory zoned zircons in a migmatitic granite from the Tjarnesjo intrusion, southwest Sweden, reveal fine-scale brittle fracturing. The oscillatory zoned fragments are rotated but not dispersed. Fractures between individual fragments are sealed by newly formed CL-bright zircon. Hydraulic fracturing is the most probable mechanism. The internal structure of fractured zircons and the LREE-enriched, low Th character of CL-bright zircon both suggest that cracks between oscillatory zoned zircon fragments were rapidly sealed after fracturing by CL-bright zircon, precipitated from hydrothermal fluids. Zircon fracturing and crack-sealing has been dated by SIMS ion-probe and U-Th-Pb isotopes to 920 +/- 51 Ma (lower intercept age, 2 sigma, MSWD = 1.09) with a limit for the Youngest possible age of 960 +/- 16 Ma (Pb-207/(206) Pb, 2 sigma, MSWD = 0.23) dated by sector-zoned rims forming overgrowths on the fractured cores. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
hydraulic, sveconorwegian, U-Pb, cathodoluminescence, zircon, hydrothermal, fracturing, EBSD, SIMS
in
American Mineralogist
volume
92
issue
7
pages
1213 - 1224
publisher
Mineralogical Society of America
external identifiers
  • wos:000247890700026
  • scopus:34547578742
ISSN
0003-004X
DOI
10.2138/am.2007.2458
language
English
LU publication?
yes
id
13ee665d-2bf7-441b-8867-9df31cf7db57 (old id 646019)
date added to LUP
2007-12-14 11:21:43
date last changed
2017-07-02 04:18:40
@article{13ee665d-2bf7-441b-8867-9df31cf7db57,
  abstract     = {The entire population of magmatic oscillatory zoned zircons in a migmatitic granite from the Tjarnesjo intrusion, southwest Sweden, reveal fine-scale brittle fracturing. The oscillatory zoned fragments are rotated but not dispersed. Fractures between individual fragments are sealed by newly formed CL-bright zircon. Hydraulic fracturing is the most probable mechanism. The internal structure of fractured zircons and the LREE-enriched, low Th character of CL-bright zircon both suggest that cracks between oscillatory zoned zircon fragments were rapidly sealed after fracturing by CL-bright zircon, precipitated from hydrothermal fluids. Zircon fracturing and crack-sealing has been dated by SIMS ion-probe and U-Th-Pb isotopes to 920 +/- 51 Ma (lower intercept age, 2 sigma, MSWD = 1.09) with a limit for the Youngest possible age of 960 +/- 16 Ma (Pb-207/(206) Pb, 2 sigma, MSWD = 0.23) dated by sector-zoned rims forming overgrowths on the fractured cores.},
  author       = {Rimsa, Andrius and Whitehouse, Nij. and Johansson, Leif and Piazolo, S.},
  issn         = {0003-004X},
  keyword      = {hydraulic,sveconorwegian,U-Pb,cathodoluminescence,zircon,hydrothermal,fracturing,EBSD,SIMS},
  language     = {eng},
  number       = {7},
  pages        = {1213--1224},
  publisher    = {Mineralogical Society of America},
  series       = {American Mineralogist},
  title        = {Brittle fracturing and fracture healing of zircon: An integrated cathodoluminescence, EBSD, U-Th-Pb, and REE study},
  url          = {http://dx.doi.org/10.2138/am.2007.2458},
  volume       = {92},
  year         = {2007},
}