Kaolin polytype evidence for a hot-fluid pulse along Caledonian thrusts during rifting of the European Margin

Parnell, J., Watt, G., Chen, H., Wycherley, H., Boyce, A., Elmore, D., Blumstein, R., Engel, M. and Gree, P. (2004) Kaolin polytype evidence for a hot-fluid pulse along Caledonian thrusts during rifting of the European Margin. Mineralogical Magazine, 68(3), pp. 419-432. (doi:10.1180/0026461046830195)

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Publisher's URL: http://dx.doi.org/10.1180/0026461046830195

Abstract

Sedimentary basins developed along the European margin during the earliest, Permian, stage of proto-Atlantic rifting, during a phase of high heat flow. The proximity of some basins to Caledonian thrusts has implied that rifts locally utilized the basement fabric. New mineralogical and palaeomagnetic data show that thrust planes in the Moine Thrust Zone channelled a Pulse of hot fluid in Permian time. The fluids precipitated kaolin in fractures in the thrust zone, and with decreasing intensity away from the zone. The high-temperature polytype dickite is largely confined to major thrust planes. Stable H and 0 isotope analyses indicate that the parent fluid included meteoric water involved in a hydrothermal system. Coeval hydrothermal hematite has a chemical remanence that dates the fluid pulse as Permian. This is direct evidence for post-orogenic activity in the thrust zone, in which the thrusts vented excess heat during regional crustal extension. The example from the European margin exemplifies the importance of deep-seated structures in the release of heat, and the value of kaolinite polytype mapping as a toot to record anomalous palaeo-heat flow.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Boyce, Professor Adrian
Authors: Parnell, J., Watt, G., Chen, H., Wycherley, H., Boyce, A., Elmore, D., Blumstein, R., Engel, M., and Gree, P.
Subjects:Q Science > QE Geology
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Mineralogical Magazine
ISSN:0026-461X

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