Dempster, T.J. and Macdonald, F. (2016) Controls on fluid movement in crustal lithologies: evidence from zircon in metaconglomerates from Shetland. Geofluids, 16(3), pp. 507-517. (doi: 10.1111/gfl.12172)
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Abstract
An investigation of the morphology of zircon in clasts and matrix of a greenschist facies metaconglomerate from Shetland has revealed a history of alteration of radiation-damaged grains, partial dissolution and growth of new zircon. These processes are linked to the generation of chemically modified dark BSE zircon that is spatially related to fractures generated during radiation damage; embayments and rounding of zircon margins; and late overgrowths of original grains. These late modifications of zircon are all linked to the presence of fluids and so zircon morphology is used to track fluid behaviour in different lithologies in the metaconglomerate. Alteration is unrelated to clast margins and radically different in various clast types. This reflects a difference in permeability and suggests that deformation strongly controls fluid influx into quartzite, whereas zircon alteration in granite is associated with a restricted permeability reflecting the more limited response to deformation events.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Dempster, Dr Tim |
| Authors: | Dempster, T.J., and Macdonald, F. |
| College/School: | College of Science and Engineering > School of Geographical and Earth Sciences |
| Journal Name: | Geofluids |
| Publisher: | Wiley |
| ISSN: | 1468-8115 |
| ISSN (Online): | 1468-8123 |
| Published Online: | 02 March 2016 |
| Copyright Holders: | Copyright © 2016 John Wiley and Sons |
| First Published: | First published in Geofluids 16(3): 507-517 |
| Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher. |
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