Modeling episodic fluid-release events in the ductile carbonates of the Glarus thrust

Poulet, Thomas; Veveakis, Manolis; Herwegh, Marco; Buckingham, Thomas; Regenauer-Lieb, Klaus (2014). Modeling episodic fluid-release events in the ductile carbonates of the Glarus thrust. Geophysical Research Letters, 41(20), pp. 7121-7128. American Geophysical Union 10.1002/2014GL061715

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The exposed Glarus thrust displays midcrustal deformation with tens of kilometers of displacement on an ultrathin layer, the principal slip zone (PSZ). Geological observations indicate that this structure resulted from repeated stick-slip events in the presence of highly overpressured fluids. Here we show that the major characteristics of the Glarus thrust movement (localization, periodicity, and evidence of pressurized fluids) can be reconciled by the coupling of two processes, namely, shear heating and fluid release by carbonate decomposition. During this coupling, slow ductile creep deformation raises the temperature through shear heating and ultimately activates the chemical decomposition of carbonates. The subsequent release of highly overpressurized fluids forms and lubricates the PSZ, allowing a ductile fault to move tens of kilometers on millimeter-thick bands in episodic stick-slip events. This model identifies carbonate decomposition as a key process for motion on the Glarus thrust and explains the source of overpressured fluids accessing the PSZ.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Other Institutions > Teaching Staff, Faculty of Science
08 Faculty of Science > Institute of Geological Sciences > Tectonics

UniBE Contributor:

Herwegh, Marco

Subjects:

500 Science > 550 Earth sciences & geology
500 Science

ISSN:

0094-8276

Publisher:

American Geophysical Union

Language:

English

Submitter:

Marco Herwegh

Date Deposited:

01 May 2015 13:26

Last Modified:

18 Sep 2015 17:50

Publisher DOI:

10.1002/2014GL061715

BORIS DOI:

10.7892/boris.67723

URI:

https://boris.unibe.ch/id/eprint/67723

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